Appendix S: Acronym Glossary

  • 2R –
     resurfacing or restoration
  • 3R –
     resurfacing, restoration, or rehabilitation
  • 4R -
     reconstruction
  • AADT –
    Annual Average Daily Traffic
  • AASHTO –
     American Association of State Highway and Transportation Officials
  • ABM –
     activity-based models
  • ADT –
    Average daily traffic
  • AFs –
     adjustment factors
  • AIIR –
     Alternative Intersection/Interchange Informational Report
  • ARCADY –
     Assessment of Roundabout Capacity and Delay
  • ATDM –
     Active Transportation and Demand Management
  • ATP –
     Active Transportation Plan
  • ATR –
     automated traffic vendors
  • ATS –
     average travel speed
  • AVL –
     automatic vehicle location
  • AWSC –
     all-way stop controlled
  • B/C –
     Benefit/Cost
  • BDAE –
     bounded dynamic absolute error
  • BEA –
     Bureau of Economic Analysis
  • BLS –
    Bureau of Labor Statistics
  • BLTS –
     Bicycle Level of Traffic Stress
  • BPCX –
     Bicycle and Pedestrian Count Exchange
  • BTS –
     Bureau of Transportation Statistics
  • CAFs –
     capacity adjustment factors
  • CAP-X –
     Capacity Analysis for Planning of Junctions
  • CAVs –
     connected and automated vehicles
  • CE –
     categorical exclusion
  • CFI –
     continuous flow interchange
  • CGT –
    continuous green-T
  • CSJ –
     control section job
  • CMF –
     crash modification factors
  • CORSIM –
     Corridor Simulation
  • CR-3 –
     Texas peace officer’s crash reports
  • CRF –
     crash reduction factors
  • CRIS –
     Crash Records Information System
  • DAFs –
     demand adjustment factors
  • DCD –
     double crossover diamond
  • DCM –
     data collection measurements
  • DCP –
     data collection points
  • DDI –
    diverging diamond interchange
  • DES –
     Design Division
  • DFO –
     distance-from-origin
  • DHV –
     design Hourly volume
  • DLT –
     displaced left turn
  • DSD –
     Desired speed decision
  • DTA –
     dynamic traffic assignment
  • EA –
     environmental assessment
  • EB –
     Empirical Bayes
  • EDTT –
     extra distance travel time
  • EIS –
     Environmental Impact Statement
  • ESAL –
     equivalent single axle load
  • ESD –
    emergency stop distance
  • ESRI –
     Environmental Systems Research Institute
  • ETT –
     experienced travel time
  • FAA –
     Federal Aviation Administration
  • FAF –
     Freight Analysis Framework
  • FCD –
     floating car data
  • FEMA –
     Federal Emergency Management Agency
  • FHWA –
     Federal Highway Administration
  • FREEVAL –
    FREeway EVALuation
  • GDP –
     gross domestic product
  • GEH –
     Geoffrey E. Havers
  • GIS –
     geographic information system
  • GPS –
    global positioning system
  • HCM –
    Highway Capacity Manual
  • HCS –
     Highway Capacity Software
  • HOT –
     high occupancy toll
  • HOV –
     heavy occupancy vehicles
  • HPMS –
     Highway Performance Monitoring System
  • HSIP –
     Highway Safety Improvement Program
  • HSM –
     Highway Safety Manual
  • HSM2 –
     Highway Safety Manual 2nd edition
  • HSS –
     Highway Safety Software
  • IAJR –
     interstate access justification report
  • ICE –
     Intersection Control Evaluation
  • ICD –
     Inscribed circle diameter
  • IHSDM –
     Interactive Highway Safety Design Model
  • ISATe –
     Enhanced Interchange Safety Analysis Tool
  • ITE –
     Institute of Transportation Engineer
  • ITS –
     intelligent transportation system
  • KABCO –
     K = Killed, A = Incapacitating Injury, B = Non-incapacitating Injury, C = Possible injury, O = Not injured
  • LCD –
     lane change distance
  • LOE –
     level of effort
  • LOS –
    level-of-service
  • MDOV –
     maximum deceleration of own vehicle
  • MEV –
     million entering vehicles
  • MOE –
     Measure of Effectiveness
  • Mph –
     miles per hour
  • MPO –
     Metropolitan Planning Organization
  • MRM –
     Multi-Resolution Modeling
  • MSTR –
     MicroStrategy
  • MTI –
     Mineta Transportation Institute
  • MTP –
     metropolitan transportation plan
  • MUT –
     median u-turn
  • MVMT –
     million vehicle miles traveled
  • NACTO –
     National Association of City Transportation Officials
  • NCHRP –
     National Cooperative Highway Research Program
  • NEPA –
     National Environmental Policy Act
  • NPMRDS –
    National Performance Management Research Data Set
  • NPV –
    net present value
  • NSC –
     National Safety Council
  • NWS –
     National Weather Service
  • OD –
     origin-destination
  • OM –
     operations and maintenance
  • OPCC –
     Opinion of Probable Construction Cost
  • PBPD –
     Performance Based Practical Design
  • PCE –
     passenger car equivalent/equivalency
  • Pcpmpl –
     passenger cars per mile per lane
  • PDS –
     Project Development Stage
  • PFFS –
     percent of free-flow speed
  • PHB –
     pedestrian hybrid beacon
  • PHF –
     peak hour factor
  • PHT –
     person hours of travel
  • PIP –
     Public Involvement Plan
  • PLTS –
     Pedestrian level of traffic stress
  • PM –
     preventative maintenance
  • PMIS –
     Pavement Management Information System
  • PS –
     Project Specific
  • PSI –
     potential for safety improvement
  • PS&E –
     plans, specifications, and estimates
  • PSAP –
     pedestrian safety action plan
  • PTSF –
     percent time-spent-following
  • PTV –
     Planung Transport Verkehr
  • R–
     Required
  • RAID –
     Roundabouts and Alternative Intersection Designs
  • RBC –
     Ring Barrier Controllers
  • RCUT –
     restricted crossing u-turn
  • RDM –
     Roadway Design Manual
  • RHiNo –
    Roadway-Highway Inventory Network
  • RITIS –
     Regional Integrated Transportation Information System
  • ROW –
     Right-of-Way
  • RRFB –
     rectangular rapid-flashing beacon
  • RRP –
    reliability reporting period
  • RSA –
     Road Safety Assessment
  • RSA –
     reduced speed areas
  • RTM –
     regression-to-the-mean
  • RTOR-
     right-turn-on-red
  • RTP –
     Rural Transportation Plan
  • SAM –
     Statewide Analysis Model
  • SAFs –
     speed adjustment factors
  • SEAs –
     Safety Emphasis Areas
  • SHSP –
     Strategic Highway Safety Plan
  • SIDRA –
     Signalized and Unsignalized Intersection Design and Research Aid
  • SII –
     Safety Improvement Index
  • SLRTP –
     statewide long range transportation plan
  • SMS –
     space-mean-speed
  • SOP –
     Standard Operating Procedure
  • SOV –
     Single occupancy vehicle
  • SPF –
     safety performance functions
  • SPICE –
     safety performance of intersection control evaluation
  • SPUI –
     single-point urban interchange
  • SST –
     Safety Scoring Tool
  • SSWP –
     Systemic Safety Widening Program
  • STARS –
    Statewide Traffic Analysis and Reporting System
  • SUPLOS –
    Shared Use Path Level-of-Service
  • TAHD –
     Traffic Analysis for Highway Design
  • TAZ –
     Traffic Analysis Zone
  • TCAP –
     TxDOT Comprehensive Accessibility Program
  • TCAT –
     Truck Congestion Analysis Tool
  • TDC –
     Texas Demographic Center
  • TDM –
     Travel demand model
  • TIA –
     Traffic Impact Analysis
  • TIM –
     Traffic incident management
  • TIM-BC –
     Traffic Incident Management Benefit-Cost
  • TMC –
     turning movement count
  • TMIP –
     Travel Model Improvement Portal
  • TMS –
     Time-mean-speed
  • TMUTCD –
     Texas Manual on Uniform Traffic Control Devices
  • TNRIS–
     Texas Natural Resources Information System
  • TOPS-BC –
     Tool for Operations Benefit/Cost
  • TPP –
     Transportation Planning and Programming (TxDOT Division)
  • TRB –
     Transportation Research Board
  • TRC –
     Texas Railroad Commission
  • TRF –
     Traffic Safety Division
  • TRL –
     Transport Research Laboratory
  • TSAP –
     Traffic and Safety Analysis Procedures (Manual)
  • TSM –
     Transportation System Management
  • TSMO –
     Transportation Systems Management and Operations
  • TTI –
     Texas A&M Transportation Institute
  • TWSC –
     two-way stop-controlled
  • TxDOT –
     Texas Department of Transportation
  • USACE –
     United States Army Corps of Engineers
  • USFWS –
     United States Fish and Wildlife Service
  • UTP –
     Unified Transportation Program
  • V/C –
     volume-to-capacity (ratio)
  • VHD –
     Vehicle hours of Delay
  • VHT –
     Vehicle Hours of Travel
  • VPD –
     Vehicles per day
  • Vissim –
    Verkehr in Staedten Simulation
  • VMT –
     Vehicle Miles of Travel
  • Vph –
     vehicles per hour
  • Vphpl –
     Vehicles per hour per lane
  • Vpmpl –
     vehicles per mile per lane
  • VTRIS –
     vehicle travel information system
  • WIM –
     Weigh-in-motion
  • XDLT –
     crossover displaced left-turn