R
radian
A radian is an arc of a circle equal in length
to the radius. A radian is the angle at the center measured by the
arc.
Survey Manual
radius
R
A radius is a line segment extending from the
center of a circle to the curve.
Survey Manual
radius of gyration
A radius of gyration is the distance from the
reference at which all of the area can be considered concentrated
that still produces the same moment of inertia. Numerically, it
is equal to the square root of the moment of inertia, divided by
the area.
railroad crossing
RRX
A railroad crossing is a crossing of a highway
and a railroad.
rainfall intensity
Rainfall intensity is a value expressing rainfall
in terms of inches per hour used in hydraulic calculations. The
term “one inch per hour of rainfall” equals approximately one cubic
foot per second per acre.
ramp
A ramp is an interconnecting roadway or a traffic
interchange on which vehicles may enter or leave a designated highway.
ramp, entrance
A ramp, entrance, is an interconnecting roadway
for the transfer of traffic from a low-speed, local service facility
to a higher-speed, through facility.
ramp, exit
A ramp, exit, is an interconnecting roadway for
the transfer of traffic from a high-speed, through facility to a
low-speed, local facility.
ramp, terminals
A ramp, terminals, is the nose of a ramp at its
point of mergence or divergence with either a local street, frontage
road, or traffic lane of the through highway.
ranch road
RR
Ranch road is only Ranch Road 1; considered part
of the farm to market road system, so designated by the Texas Transportation
Commission. Ranch road spur is also a roadway so designated by
the Texas Transportation Commission, which is designated within
the description of the ranch road.
Texas Reference Marker (TRM) System User's
Manual
ranch to market road
RM
A ranch to market road is a roadway so designated
by the Texas Transportation Commission. Ranch to market road spur
is also a roadway so designated by the Texas Transportation Commission,
which is designated within the description of the ranch to market
road.
Texas Reference Marker (TRM) System User's
Manual
raster
Raster is the system for digitally defining an
image by dividing the image into a specified number of square areas
and assigning one of 256 density values to each of these areas.
Photoshop is a raster-based image-editing program.
Communications Manual
rated source
A rated source is a source with one or more aggregate
products(s) meeting the AQMP, Aggregate Quality Monitoring Program,
eligibility and acceptance criteria and rated statistically for
quality by MAT.
Manual of Testing Procedures
rated source quality catalog
The rated source quality catalog is a catalog
published biannually by MAT to update the rated source statistical
values for the quality tests covered by the AQMP, Aggregate Quality
Monitoring Program.
Manual of Testing Procedures
Inspection Guide
rational method of design drainage
structure
A rational method of design drainage structure
is a design method based on the principle that the maximum rate
of run off from a given watershed for an assumed intensity of rainfall
occurs when all parts of the area are contributing to the flow of
discharge. Expressed as a formula this method becomes: Q = CIA.
raveling
- Raveling is an Asphaltic Concrete Pavement (ACP) distress type. It is the progressive disintegration of the surface due to disledgement of aggregate particles. Pavement Management Information System (PMIS) ratings for raveling range from 0 (none) to 3 (most).Pavement Management Information System (PMIS) Users Manual
- Raveling is the progressive failure of the binder and loss of aggregate from the surface by weathering and/or traffic abrasion.Maintenance Collection
readability
Readability is the smallest division or fraction
of a division to which a visual output can be accurately read or
estimated. For digital load indicators, this is the smallest incremental
change for each range. NOTE: Some digital load indicators change
readability without warning.
Some change from 0.01 to 0.02 and 0.05 g, others from 0.1
to 0.5 gas the weight increases.
Manual of Testing Procedures
read-only memory
ROM
Some computers and most microprocessors have some
form of memory that represent either by the manufacturer or in some
one-time process so that ROM only has one set of information and
does not have the hardware to rewrite (and thus to erase) its contents.
real property
Real property is land, including improvements,
structures, and appurtenances, but excluding movable machinery and
equipment.
Public Transportation Collection
reappraisal
Reappraisal is a second or subsequent appraisal
of property after the initial appraisal, updating the values for
negotiation or eminent domain purposes, or due to a market change.
Right of Way Collection
Reasonable Accommodation Review
Committee
RARC
The Reasonable Accommodation Review Committee
is a committee to review accommodation requests that will cost more
than $2,000. The RARC consists of representatives of the:
- Director of Human Resources Division
- Director of the Office of Civil Rights
- Director of the Finance Division
- Director of the Occupational Safety Division, and
- Office of General Counsel.
Human Resources Manual
rebuilt (re-life) equipment
Rebuilt (re-life) equipment is the complete refurbishment
of a piece of equipment or the extensive refurbishment at an established
interval to a major component, such as an aerial device.
Equipment Manual
receipts
Receipts are all cash deposits.
Finance Division
receiving agency
The receiving agency is the agency compensating
the performing agency for services or resources.
Contract Management Manual
receiving district, division or
office
The receiving district, division or office is
the office responsible for preparing and managing the contract,
including processing payments.
Contract Management Manual
receiving hopper
The receiving hopper is the front part of a paver,
where hot mix is received from the haul truck.
receiving waters
Receiving waters are the waters into which runoff
flows.
reciprocity
Reciprocity is a preference applied against a
bidder whose home jurisdiction has preferences. Used for bid evaluation
purposes only.
Purchasing Manual
reclassification
Reclassification is the process of reviewing the
actual duties performed in a position and assigning the position
to a state and business category consistent with the duties and
job description. Reclassification is not to be interpreted as a
change in duty assignment.
Human Resources Manual
recommended value
Recommended value is the value for a parcel recommended
as just compensation by the reviewing appraiser after his/her review
of the appraisal report.
Right of Way Collection
reconstruction (4R) project
Work proposed on the approximate alignment of
an existing route that meets the geometric criteria for a new facility.
Reconstruction includes new location projects or projects that
provide substantial changes in the general geometric character of
a highway, such as widening to provide additional through travel
lanes, horizontal or vertical re-alignment, etc. Reconstruction
work includes bridge replacement work.
record copy
The record copy of a document or collection of
documents in a file is the “official” copy of a record subject to
records retention requirements.
Records Management Manual
Record Of Decision
ROD
The final approval of an Environmental Impact
Statement issued by the Federal Highway Administration.
record owner
A record owner is the owner of record in a particular
political subdivision of the State.
Right of Way Manual
record series
A record series is a single specific type of record
or file or a group of files that are similar in function and have
similar retention requirements.
Records Management Manual
records retention schedule
A records retention schedule is a document describing
records produced and maintained by TxDOT, including information
on the minimum required retention, the medium of the record, its status
as a confidential or vital record, and whether the record is subject
to review by the State Archives before it may be destroyed.
13 TAC §6.1(12);
Records Management Manual
recreational road
RE
A recreational road is a roadway so designated
by the Texas Transportation Commission. Recreational Road Spur
is also a roadway so designated by the Texas Transportation Commission.
Texas Reference Marker (TRM) System User's
Manual
recycled asphalt pavement
RAP
Recycled asphalt pavement is hot mix asphalt and
any accompanying tack coat, seal coat or chip seal removed as millings
or broken pavement pieces from a road during construction, reconstruction
or repavement.
Materials and Supplies Management System Manual
reduction in force
RIF
Reduction in force is the involuntary separation
from employment of employees whose positions have been eliminated
for reasons not related to substandard performance or rule violations.
Human Resources Manual
redundant array of inexpensive
disks
RAID
Redundant array of inexpensive disks is a type
of data storage mechanism in which large numbers of small and inexpensive
hard disks are utilized in combination to provide for data protection, redundancy
and recoverability.
reference items
Reference items are standard or special specifications
used to supplement other specifications. They are noted, mentioned,
or referenced in the specification itself or in a plan or general
note or by provision.
PS and E Preparation Manual
reference marker
A reference marker is the building block of the
TRM Highway Data File and the link between the automated files and
what is actually on the ground. Reference markers replace control-section-milepoint,
milepost, link-node, or others as the sole source of location identification
for highway-related on-system data.
Texas Reference Marker (TRM) System User's
Manual
reference marker displacement
Reference marker displacement is the distance
in miles from a posted reference marker on the signed highway route
to a data attribute or feature.
Texas Reference Marker (TRM) System User's
Manual
reference marker group
A reference marker group consists of the Reference
Marker Number + Reference Marker Suffix + Signed Reference Marker
Displacement.
Texas Reference Marker (TRM) System User's
Manual
reference marker number
The reference marker number is the official number
posted on the signed highway route. Markers are numbered from state
line to state line and from westernmost or northernmost point of
the Highway origin (south to north for interstate highway post numbering).
Texas Reference Marker (TRM) System User's
Manual
reference marker sign
A reference marker sign is a symbol indicating
the ascending (+) or descending (–) direction to a data attribute
or feature from a posted reference marker.
Texas Reference Marker (TRM) System User's
Manual
reference marker suffix
A reference marker suffix is the posted suffix
character, if any, appended to the reference marker number on the
signed highway route.
Texas Reference Marker (TRM) System User's
Manual
reference temperature profile
Reference temperature profile is a graph generated
by the match cure system representing time versus temperature (heat
of hydration) of the in-situ concrete.
Manual of Testing Procedures
reference test report
Reference test reports are issued to any current
project using item specific material on a QM program within the
program guidelines.
Manual of Testing Procedures
reflector
A reflector is a polished aluminum device used
to reflect light.
Highway Illumination Manual
reflector units
There are two types of reflector units. Type A
reflector units have reflective sheeting applied to the substrate.
Type B reflector units have center mounted acrylic plastic reflectors.
Manual of Testing Procedures
refractor
A refractor is a prismatic glass element used
to refract light.
Highway Illumination Manual
refueling emissions
Refueling emissions are gasoline vapor emissions
generated by the refueling of vehicles where the vapor in the vehicle
fuel tank is displaced by the incoming liquid fuel and released
into the atmosphere.
Traffic Data and Analysis Manual
regional automation center
RAC
A regional automation center is one of the TxDOT
computer facilities at Austin (not the central system), Houston,
Dallas, Ft. Worth, Odessa, and San Antonio in which large computers
are in use by the department. These computers have extensive linkage
between each other and the central system.
regional computing center
RCC
A regional computing center (RCC) provides district-to-center
and center-to-Austin communications. Automated facilities are located
at 6 host district offices (Houston, Dallas, Ft. Worth, Odessa, San
Antonio, and Austin) that consist of IBM 4341 and VAX.
Regional Liaison
Officer
RLO
A Regional Liaison Officer (RLO) is a member of
the Governor’s Division of Emergency Management staff. The RLOs
are stationed throughout the state. These field response personnel
assist local officials in planning and carrying out emergency preparedness
programs, teach a variety of emergency management courses, identify
needs and advise local officials during incidents and disasters, and
help coordinate state emergency resource support.
Maintenance Division
regional pooled-fund study
A regional pooled-fund study is a planning or
RD&T study expected to solve problems of regional significance.
The study is usually administered by an FHWA region office in cooperation
with a lead state and/or MPO, that is funded by state and/or MPO
contributions of FHWA planning and research funds, with or without
matching funds.
Transportation Planning and Programming Collection
regionally significant project
A regionally significant project is a project
(other than projects excluded by the cooperating parties from individual
identification and grouped in the STIP/TIP) that is on a facility
which serves regional transportation needs. Needs such as access
to and from the area outside of the region, major activity centers
in the region, major planned developments such as new retail malls,
sports complexes, etc., or transportation terminals as well as most
terminals themselves) and would normally be included in the modeling
of a metropolitan area’s transportation network, e.g., all principal
arterial highways and all fixed guideway transit facilities.
Transportation Planning and Programming Collection
registered professional land survey
RPLS
A registered professional land surveyor is a board
certified professional qualified to provide value to the Texas Department
of Transportation
Survey Manual
registration authority
RA
The registration authority keeps, monitors, and
distributes certificates for the PKI process.
Information Security Manual
regular standby time
Regular standby time is standby time that is routinely
scheduled for employees on a rotating basis.
Human Resources Manual
regular overtime
Regular overtime is time worked over eight hours
in one day, on a paid holiday, or on weekends. All regular overtime
worked is compensated with regular compensatory time at the rate
of one hour earned for every hour worked. Regular compensatory time
may be earned by non-exempt and exempt employees.
Human Resources Manual
regulated output ballast
A regulated output ballast is a form of electrical
transformer that maintains the wattage of the lamp at a nearly constant
value, though the line voltage may fluctuate as much as ±10 percent.
Such ballasts or transformers may be integrally mounted within
the luminaire or separately mounted in a ballast enclosure.
Highway Illumination Manual
regulated highway
A regulated highway is a highway on the interstate
highway system or the primary highway system.
Right of Way Manual
regulatory signs
Regulatory signs are signs used to regulate the
traffic movement or use of public highways and is law. A regulated
sign is a sign permitted under the Transportation Code, Chapters
391 and 394 (outdoor advertising statutes).
rehabilitation (3R) project
Rehabilitation is work proposed to improve serviceability
and extend the service life of existing highways and streets and
to enhance safety. Work is usually accomplished within the existing
right of way and does not include the addition of through travel
lanes. Work may include the upgrading of geometric features such
as roadway widening, minor horizontal re-alignment, and improving bridges
to meet current standards for structural loading and to accommodate
the approach roadway width.
reinforced concrete pavement
Reinforced concrete pavement is Portland concrete
pavement in which steel is used to control the width of shrinkage
and thermal cracking of the concrete. The steel adds strength to
the concrete in tension.
reinforcement
Reinforcement is steel embedded in a rigid slab
to resist tensile stresses and detrimental opening of cracks.
Pavement Design Manual
reinforcing steel
Reinforcing steel is steel bar, steel fabric,
steel wire and seven-wire strand steel.
Manual of Testing Procedures
reinforcing steel producing mill
A reinforcing steel producing mill is a mill which
performs the hot rolling of bar, cold drawing of wire, welding of
welded wire fabric, or the stranding and heat-treatment of seven-wire
strand.
Manual of Testing Procedures
relative importance factor
RIF
Relative importance factor is the numerical weight
of each evaluation criterion as it relates to a particular contract.
Engineering Architectural and Surveying Services
Manual
release of tension cylinders
Release of Tension Cylinders are cylinders used
to determine when the concrete strength is adequate to apply the
pretensioning force.
700-I, Structural Test Procedures Manual
reliability
Reliability of a pavement design/performance process
is the probability that a pavement section designed using the process
will perform satisfactorily during the design period under the given
traffic and environmental conditions.
Pavement Design Manual
relocation assistance
Reloc Asst
Relocation assistance is an advisory and/or financial
aid to persons, businesses, farms and non-profit organizations displaced
by a highway project to assist them in becoming re-established,
at rents or prices within their financial means, in dwellings that
are decent, safe and sanitary.
Right of Way Manual
relocation specialist
A relocation specialist is a person employed by
the State to assist displaced persons with advisory or financial
aid during their relocation.
Right of Way Manual
remainder
A remainder is that area of a parcel of land which
remains in the possession of the property owner after the part to
be acquired has been taken, either by purchase or condemnation by
the State.
Right of Way Manual
remedies
Remedies are instructions provided (in accordance
with the contract) to the performing entity for corrective action.
Contract Management Manual
remote access
Remote access is the use of a modem and communications
software to connect to a computer network from a distant location
via a telephone line or wireless connection
Information Security Manual
remote job entry
RJE
Remote job entry is used from the remote terminals
in the computer systems in the department for users to input their
data directly over data communication lines to computers. This avoids
mailing the data or using telephones to get the data to the computer
site. Output from the computer systems is also by remote job output.
remote job entry job control language
RJEJCL
Remote job entry job control language is a prompted,
menu-driven programming function in regional remote operating system
conversational online environment (ROSCOE) that assists the user
in building job control language (JCL) and submitting jobs.
Design and Construction Information System
Manual
remote location
Remote location is a specific location twenty
or more miles from a MAT office.
Remote Operating System Conversational
Online Environment
ROSCOE
Remote operating system conversational operating
environment (ROSCOE) is an online text-editing and remote job entry
system. It is actually designed as a text editor with a library
to save and retrieve text. ROSCOE is not designed to be a word processor.
ROSCOE interfaces with the computer operating system. This interface
allows the user to submit batch jobs, to examine the output from
those jobs, and to determine disposition (print, delete, very temporary
retention, or resubmission after error correction).
Design and Construction Information System
Manual
remote terminal access
Remote terminal access is access to a system by
any terminal device which is not directly attached to it via a dedicated
connection.
remote user
A remote user is one that is not located at the
same place as is the computer system to which communications have
been established. Remote communications for this type of user is
usually established through dial-up telephone lines.
removable media
Removable media are materials that hold data in
any form or that allow data to pass through them, including paper,
transparencies, multipart forms, hard, floppy and optical disks,
magnetic tape, wire, cable and fiber.
Information Security Manual
rented or public conveyance
Rented or public conveyance means a motor vehicle,
train, or aircraft that an employee rents or pays for to use on
a short-term basis while traveling on official state business.
Travel Manual
re-order point
ROP
A re-order point is when the inventory level is
low enough to order stock.
Materials And Supplies Management System Manual
re-order quantity
ROQ
Re-order quantity is the quantity to order when
the re-order point is reached.
Materials And Supplies Management System Manual
repeater
A repeater is a device that receives a digital
signal on an electromagnetic or optical transmission medium and
regenerates the signal along the next leg of the medium.
Information Security Manual
replacement credit
Replacement credit is an inventory notation in
the public transportation management system (PTMS) that indicates
TxDOT has awarded funds to replace a transit vehicle, regardless
of whether a transit agency physically disposes of the vehicle.
Public Transportation Collection
request
A request is an order from a stock account or
customer to another stock account.
Materials And Supplies Management System Manual
request for discussion
RFD
A request for discussion is a posting that proposes
the creation of a new Usenet news group.
Information Technology and Services Manual
request for information
RFI
Request for information is a formal method of
obtaining information to be used in a procurement.
Purchasing Manual
request for offer
RFO
Request for offer is a solicitation used with
the catalog purchase procedure.
Purchasing Manual
request for proposal
RFP
- Request for proposal is the package a prospective entity (provider) receives from the department to help formulate a proposal to perform a service for the department. Upon submission of the proposal, it is scored and evaluated by the department using the criteria communicate to the prospective entity in the RFP it received.Contract Management Manual
- Request for proposal is a method of solicitation used for selected, technically complex procurements when deliverables cannot be easily defined.Purchasing Manual
- Request for proposal is a request for submittal of a technical proposal from a provider that demonstrates competence and qualifications to perform the requested services, and shows an understanding of the specific contract.Engineering Architectural and Surveying Services Manual
- Request for proposal is a procurement process used when the property, equipment or services to be acquired are described in a performance or functional specification; the number of bidders is uncertain despite public solicitation; price alone is not a determinant; and discussions are expected with the bidder.Public Transportation Collection
request for (price) quote
RFQ
Request for quote is a method of solicitation
used for informal competitive bidding.
Purchasing Manual
requisition
A requisition is a request from a stock account
to purchase an item.
Materials And Supplies Management System Manual
rescue service
Rescue service are the personnel designated to
rescue employees from permit spaces.
Occupational Safety Manual
research
Research is a systematic, controlled inquiry,
often involving analytical or experimental activities, which seeks
to gain new knowledge and which may involve development of new or
revised products. Research includes basic research, applied research,
state-of-the-art or practice surveys and studies, development, and
research field testing. Software program development which solely
automates the use of existing technology, formulae, knowledge and
methods is specifically excluded from the definition of research.
Research and Implementation Manual
Research and Technology Implementation
Office
RTI
The TxDOT Research and Technology Implementation
Office is charged with research and implementation program management.
Research and Implementation Manual
research management committee
RMC
A research management committee is one of five
committees responsible for development of the research program.
Research and Implementation Manual
research oversight committee
ROC
The research oversight committee is comprised
of the chairs of the RMCs, selected division and office directors,
FHWA, plus a chair and vice-chair representing the TxDOT administration.
Research and Implementation Manual
resident bidder
A resident bidder is a business entity whose principal
place of business is in Texas, including an entity whose ultimate
parent company or majority owner has its principal place of business
in Texas.
Letting Manual
resilient modulus
Resilient modulus is a measure of the modulus
of elasticity of roadbed soil or other pavement material.
Pavement Design Manual
resistance temperature detector
RTD
A resistance temperature detector is a sensor
used to measure temperature. The sensor is usually made of a metal
such as nickel or platinum and whose resistance varies with the
temperature. This resistance change is predictable and is stable
with time and use.
Manual of Testing Procedures
resistivity
Resistivity decreases with an increase in moisture
content of a material until the minimum resistivity is obtained.
This minimum resistivity value is defined as the resistivity of
the material.
Manual of Testing Procedures
resolution
Resolution is the relative number of pieces of
information which defines an image. The number of areas into which
a square inch can be divided upon output by an imagesetter. An image
scanned at 100 DPI would be defined by pixels 1/100 inch by 1/100
inch in size, or 10,000 per square inch. A 300 DPI laser printer
prints an image at 300 DPI, even if the image itself exists digitally
at substantially higher resolution.
Communications Manual
resources
Resources include materials, equipment and supplies.
Contract Management Manual
respondent
A respondent is the administration or D/D/O/R responsible
for responding to a grievance or an appeal.
responsible district
Responsible district is a Pavement Management
Information System (PMIS) term which identifies the district responsible
for maintaining a segment of highway. This term is used instead
of just “district” because some isolated segments of highway are
located in one district but are actually maintained by another (responsible)
district.
Pavement Management Information System (PMIS)
Users Manual
responsive bidders
Responsive bidders are those who have successfully
completed and provided all required forms and documents, made proper
acknowledgments, attended any mandatory pre-bid conference, and secured
technical prequalification (if applicable). Their bids should be
read at the public bid opening.
Letting Manual
rest area
A rest area or safety rest area (SRA)is a TxDOT-operated
facility that offers parking, rest room facilities, water, picnic
arbors, wireless internet services, etc., for the traveling public.
Rest areas are open 24 hours a day, 365 days a year.
Maintenance Division
resting loss emissions
Resting loss emissions are small, continuous seepage
and minor leakage of gasoline vapor through faulty connections,
permeable hoses and other materials in the fuel system.
Traffic Data and Analysis Manual
restoration (2R) project
Work proposed to restore the pavement structure,
riding quality, or other necessary components to their existing
cross section configuration. Upgrading roadway components as needed
to maintain the roadway in an acceptable condition may be included
in the restoration work. The addition of through travel lanes is
not permitted under a restoration project.
resurfacing
Resurfacing is the application of an additional
surface to an existing base pavement or wearing surface to improve
the ride, strength, or safety of the pavement.
retail employment
Retail employment is employment that occurs in
businesses classified as retail under the standard industrial classification
system.
Traffic Data and Analysis Manual
retainage
Retainage is the percent of each contractor payment
retained until contract completion.
Contract Management Manual
retained right
Retained right is the right of a property owner,
retained through agreement with the State, to cross a proposed highway
or roadway.
Right of Way Collection
retaining walls
Retaining walls are vertical wall used to retain
earth. A wall for sustaining the pressure of earth or filling deposited
behind it.
Geotechnical Manual
retaliation
Retaliation is the action, harm or injury intentionally
inflicted or imposed upon another as an act of revenge. The alleged
retaliation may consist of discipline, harassment, difference in
treatment, etc. A grievance alleging retaliation may be filed by
an employee who believes she or he was retaliated against for involvement
in a specified act or participation in a protected activity such
as an investigation, opposing discrimination, filing a grievance
or whistleblower complaint, or reporting a violation of policy.
Human Resources Manual
retention items
Retention items are items required to be on-hand
for emergency use.
Materials And Supplies Management System Manual
retention value
The amount to be deducted from the amount to be
paid the owner when he chooses to retain any or all of his improvements.
Usually the salvageable value to the acquiring agency.
Real Estate Acquisition Guide for Local Public
Agencies
retrieval system
A retrieval system is the equipment (including
a retrieval line, chest or full-body harness, wristlets, if appropriate,
and a lifting device or anchor) used for non-entry rescue of persons
from permit spaces.
Occupational Safety Manual
revenue service vehicle
A revenue service vehicle is the rolling stock
(e.g. buses, vans, or railcars) used in providing transit service
for passengers. This definition does not include a vehicle used
in connection with keeping revenue vehicles in operation, such as
a tow truck or a staff car.
Public Transportation Collection
reverse commute program
A reverse commute program includes projects providing
transportation services to suburban employment centers from urban,
rural and other suburban locations.
Public Transportation Collection
reverse frontage road
See
.
revetment
revet
A revetment is a wall or a facing of wood, willow
mattresses, steel units, stone, or concrete placed on stream banks
to prevent erosion.
revised value
Revised value is a value that has been produced
by the change, revision, or modification in the appraisal process
to reflect changes in the property or conclusions of the appraiser.
Right of Way Collection
Reynolds number, aeronautic
Reynolds number is a non-dimensional coefficient
used as a measure of the dynamic scale of a flow.
rice gravity
Rice gravity is the ratio of the weight of a unit
volume of an uncompacted bituminous paving mixture to the weight
of an equal volume of gas-free distilled water. Rice gravity is
also known as theoretical maximum specific gravity.
Manual of Testing Procedures
ride score
Ride score is a Pavement Management Information
System (PMIS) term which describes the ride quality (roughness)
of a pavement surface. Ride score ranges from 0.1 (roughest) to
5.0 (smoothest).
Pavement Management Information System (PMIS)
Users Manual
right bank
Right bank is that bank of a stream which is on
the right when one looks downstream.
right of entry
ROE
An agreement from the owner of a tract or parcel
of land specifically authorizing the State (usually including in
addition to the State, its contractors, assigns, and the owners
of any utility involved with the highway project), the right to
enter upon the described tract of land for specific purposes as stated
in the agreement. Where such an agreement is without consideration
(unpaid), such constitutes just a license to go upon the property
for the purposes stated in the agreement, and it may be revocable
at the will of the person granting the right. Where a more formal
agreement is utilized and payment of more than just nominal consideration
is made, such an agreement may be (by its terms) made irrevocable
and would constitute more than a license, and would likely be legally
considered a construction easement.
right of way
ROW
- Right of way is a general term denoting land, property or interest therein, usually in a strip, acquired for or devoted to transportation purposes.Real Estate Acquisition Guide for Local Public Agencies
- Right of way is a general term denoting land, property or interest therein, usually in a strip, acquired for or devoted to a highway for the construction of the roadway. Right of way is the entire width of land between the public boundaries or property lines of a highway. This may include purchase for drainage.Maintenance Collection
right of way agreement
An agreement stating the responsibility of each
party with regard to the acquisition of ROW, relocation assistance,
and adjustment of utility facilities.
Right of Way Division
ROW
The Right of Way Division acquires land to build
highways and regulates outdoor advertising and junkyards.
Inside TxDOT
right of way line
Right of way line is a legally established line
that indicates the boundary between the highway facility and adjacent
property owners' holdings.
Right of Way Collection
right of way map
right of way map is a drawing of a proposed or
existing improvement showing its relation to adjacent property,
the parcels or portions thereof to be acquired, ownerships, and
other pertinent information.
rigid pavement
A pavement structure which distributes loads to
the subgrade, having as one course a portland cement concrete slab
of relatively high-bending resistance. Refer to �flexible pavement.
riprap
- Riprap is a sloped wall of stone or concrete used to prevent erosion.
- Riprap is broken rock, cobbles, or boulders placed on earth surfaces for protection against the action of water.
- Riprap is quarried stone especially selected, graded and placed to prevent erosion and thereby preserve the shape of a surface, slope, or underlying structure. NOTE: This definition has been approved by the Specification Committee.Manual of Testing Procedures
risk assessment
- Risk assessment is a study of vulnerabilities, threats, likelihood, loss, or impact, and theoretical effectiveness of security measures. The process of evaluating threats and vulnerabilities is known and is postulated to determine expected loss and establish the degree of acceptability to system operations.Internal Audit Manual
- Risk assessment is the identification and analysis of risks relevant to the achievement of internal control objectives, which forms the basis for determining how risks should be managed.Internal Audit Manual
roadbed
A roadbed is the graded portion of a highway between
top and side slopes, prepared as a foundation for the pavement structure
and shoulder.
Pavement Design Manual
roadbed material
Roadbed material is the material below the subgrade
in cuts and embankments and in embankment foundations, extending
to such depth as affects the support of the pavement structure.
Pavement Design Manual
roadbed-mile
A roadbed-mile is a measure of the total length
of constructed highway materials in-place or proposed. A roadbed-mile
is the same as a centerline-mile except on a divided highway, where
the length is doubled to account for the presence of two-way traffic.
Pavement Management Information System (PMIS)
Users Manual
roadbed, prepared
See
.
roadeo
Roadeo is TxDOT’s truck driving competition for
employees.
Occupational Safety Manual
roadway
Rdwy
- Roadway is the portion of the highway within the limits of construction.Pavement Design Manual
- Roadway is that portion of a highway improved, designed, or ordinarily used for vehicular travel, exclusive of the berm or shoulder. In the event a highway includes two or more separate roadways, the term “roadway” as used in the Equipment Manual shall refer to such roadway separately, but not to all such roadway collectively.Equipment Manual
Roadway Design System
RDS
Roadway Design System is a software package to
design roads or highways. It can include preliminary route location,
design, and final design phases. Functions include control survey
calculations; compute and plot horizontal and vertical roadway alignments,
geometric calculations, compute areas, provide data for preparation
of deeds, drawing interchange layouts and right-of-way plans; draw
original, design and final cross-sections; design medians, special
ditches, and benched slopes; compute earthwork quantities for up
to six roadways at one time, draw mass diagram and compute overhaul;
perform bridge geometry calculations and preliminary bridge design,
store design criteria and design calculations or project tape for
future use; can update, revise, or add new design data, and create
perspective views.
roadway excavation
Roadway excavation means the required excavation
within the limits of the roadway.
roadway gap
A roadway gap is a non-driveable space between
two roadway segments created by route deletion, redesignation, removal
of a link, or addition of a non-contiguous segment. The reference
marker location of the beginning and ending of the gap is exactly
the same.
Texas Reference Marker (TRM) System User's
Manual
roadway illumination assembly
A raodway illumination assembly is the luminaire
and supporting members (pole, mast arm, etc.) with other related
lighting equipment attached.
Highway Illumination Manual
roadway illumination details
RID
Roadway illumination details are the TxDOT standard
sheets showing specifications for roadway illumination to be used
with TxDOT standard specification Items 610, 611, 612, and 656.
The details are contained in the Traffic Operations Standard Plans.
Highway Illumination Manual
roadway improvement
A roadway improvement is construction or reconstruction
made to the roadway cross-section.
Safe Routes to School Program Guidelines
rock
Rock is a mass of solid, naturally occurring material
from an in-situ deposit, excluding conglomerates. The formation
may or may not be laminated.
rolling
Rolling is the process of applying pressure to
a lift of material to attain desired compaction.
ROSCOE PDSE Library Facility
The ROSCOE PDSE Library Facility (RPDS/PDSE) consists
of the ROSCOE Programming Facility (RPS) program, RPSD and mainframe
partitioned data sets (PDSEs) that are used to provide "libraries"
for storing data that would otherwise be stored in ROSCOE libraries.
Source:
Information Security Manual
ROSCOE (Remote Operating System
Conversational Operating Environment) Programming Facility
RPF
Within the ROSCOE terminal package a facility
known as ROSCOE Programming Facility exists for performing repetitive
functions. This allows the user to write a series of instructions
(which are actual ROSCOE commands) and call forth their execution.
ROT‑13
ROT 13 is a form of encryption that can be used
to make all or part of a Usenet posting unreadable. Others who have
the encryption key can decipher the message.
Information Technology and Services Manual
roughness coefficient
n
A roughness coefficient is a factor in the Kutter,
Manning, and other flow formulas representing the effect of channel
(or conduit) roughness upon energy losses in the flowing water.
route over or under
A bridge at intersecting highways is defined as
an underpass or overpass based on the inventory hierarchy of the
two routes. This description is used where required on all forms,
plans, etc. The is:
Interstate, US, SH, State Loops or Spurs, FM/RM, County Roads (CR),
and Business Routes (BR). The lower route number takes precedence
if the highways are of equal hierarchy. Examples are:
- IH 30 over IH 35 - IH 30 Overpass at IH 35
- IH 35 over IH 30 - IH 30 Underpass at IH 35
- FM 1234 over US 290 - US 290 Underpass at FM 1234
- CR 18 under US 183 - US 183 Overpass at County Road 18
- IH 20 Business under RM 456 - RM 456 Overpass at IH 20 Business
Bridge Inspection Manual
router
A router is a computer that transfers data between
two networks using the same set of protocols.
Source:
Information Security Manual
route realignment
Route realignment is roadway reconstruction that
causes the alignment and length of the route to change; deleting
the realigned route segment from the route creates a gap in the
roadway in TRM.
Texas Reference Marker (TRM) System User's
Manual
route study
A route study compares and analyzes alternative
route alignments within a transportation corridor with the primary
purpose of determining a preferred route alignment. The study may
be done after or as part of a .
rule
A rule is any agency statement of general applicability
that implements, interprets or prescribes law or policy, or describes
the procedure or practice requirements of an agency. A rule can
be either a policy or procedure.
rule procedures
Rule procedures are statements that describe the
action or practice required by an agency. These procedures are effective
for external parties only when published according to the Administrative Procedure
and Texas Register Act (APTRA).
running loss emissions
Running loss emissions are evaporated gasoline
emissions occurring while a vehicle is driven due to the heating
of the fuel and fuel lines.
Traffic Data and Analysis Manual
runoff
Runoff is that portion of precipitation that makes
its way toward waterways, lakes, or oceans as surface or subsurface
flow.
runoff coefficient
Runoff coefficient the fraction of total rainfall
that will appear as runoff.
rural minor collector
A rural minor collector is a road that collects
traffic from local roads, bring all developed areas within a reasonable
distance of a collector road, provide service to the remaining smaller
communities, and link the locally important traffic generators with
their rural hinterland.
Transportation Planning and Programming Collection
rural road
A rural road is a road, street, way, highway,
thoroughfare, or bridge that is located in an unincorporated area
and that is not privately owned or controlled, any part of which
is open to the public for vehicular traffic, and over which the
state or any of its political subdivisions have jurisdiction.
Right of Way Manual
Rural Transit Assistance Program
RTAP
The Rural Transit Assistance Program is a program
of research, training, technical assistance and other support services
to meet the needs of transit agencies serving nonurbanized areas.
Public Transportation Collection
Rural Transit District
RTD
A Rural Transit District is a political subdivision
of the state that provides and coordinates rural public transportation
within its boundaries in accordance with the provisions of Transportation Code,
Chapter 458.
Public Transportation Collection
Rural Transportation Improvement
Program
The Rural Transportation Improvement Program is
a staged, multiyear, intermodal program of transportation projects
that is developed by the department, in consultation with local
officials, for areas of the state outside of the metropolitan planning
area boundaries. The rural TIP includes a financially constrained
plan that demonstrates how the program can be implemented.
Transportation Planning and Programming Collection
rut
- A rut is a surface depression in a wheelpath.Pavement Management Information System (PMIS) Users Manual
- Rutting occurs when wheel track depressions have the undesirable effect of trapping water and may make vehicle control difficult. Corrections to the depressions should be made as soon as possible wherever ruts are determined to be a safety problem.Maintenance Collection