19.3 Linear Pedestrian Facilities

Linear pedestrian facilities provide an area for pedestrian travel separated from automobile traffic. For pedestrian comfort and safety, particularly along roadways with high-speed traffic, the goal is to maximize the width of the buffer between the sidewalk or shared use path and the adjacent travel lanes. As such, the desirable placement of the linear pedestrian facility is as close to the ROW line as practical.

19.3.1 Characteristics Contributing to Pedestrian Comfort and Safety Along the Roadway

A variety of roadway characteristics impact pedestrian safety and the user experience for the pedestrians walking along the roadway. Note that the impact of these characteristics on crossings are addressed in subsequent sections.
  • Presence of a sidewalk
    . Pedestrians are approximately 2.5x more likely to be involved in a crash when there is no sidewalk provided.
  • Speed of motor vehicle traffic
    . Pedestrian fatalities rise exponentially as vehicular crash speeds increase. Pedestrians also experience a decrease in comfort when walking adjacent to high-speed motor vehicle traffic. Pedestrian comfort and safety can be increased by increasing the width of the buffer zone and/or providing some type of vertical separation such as plantings. A row of parked vehicles between the sidewalk and the roadway also serves to improve pedestrian comfort.
  • Volume of motor vehicle traffic
    . Higher motor vehicle volumes also decrease pedestrian comfort along the roadway, especially when operating at speeds above 20 mph. Similar options for separation as described above should be considered when designing sidewalks on higher volume roadways.
  • Vehicle type
    . Similarly, a higher percentage of heavy vehicles on the adjacent roadway can decrease pedestrian comfort. Providing greater distance from the roadway or vertical elements may increase comfort.

19.3.2 Sidewalk Design on Curbed and Non-Curbed Roadways

Sidewalk design on curbed roadways includes designing three sidewalk zones: the pedestrian zone, the buffer furniture zone, and the frontage zone.
19.3.2.1 Pedestrian Zone
The pedestrian zone, which is also known as the “walking zone” or pedestrian circulation path, incorporates the PAR. The PAR is the portion of the pedestrian zone dedicated to ADA accessible pedestrian movement which must meet specific grading requirements and be free from obstructions or protruding objects.
The pedestrian zone should be wide enough to accommodate the volume and type of pedestrian traffic expected in the area. The minimum pedestrian zone width is 5-ft. In areas of higher expected pedestrian volumes, such as near schools, parks, in suburbanizing areas, and along transit routes, a pedestrian zone of 6-ft or more is desired to provide for side-by-side walking and passing. Pedestrian zone widths of 8-ft or more may be appropriate in downtown commercial areas and in other areas with concentrated pedestrian traffic.
Where necessary to avoid an obstruction or to cross a driveway while maintaining the maximum 2.0 percent cross slope, the pedestrian zone may be reduced to 4-ft for short distances. Sidewalks less than 5-ft in width must include passing sections of 5-ft x 5- ft no more than every 200-ft, though more frequent passing areas should be prioritized.
While sidewalks do not need to be perfectly straight, the pedestrian zone should not weave back and forth in the ROW for no other reason than to introduce curves. Meandering sidewalks create navigational difficulties for pedestrian with vision disabilities.
19.3.2.1.1 Curbed Roadways
Where a sidewalk is placed immediately adjacent to the back of curb with no buffer, a minimum pedestrian zone width of 6-ft is desirable and 7-ft preferred to allow additional space for street and highway hardware and allow for the proximity of moving traffic. A minimum of 8-ft of width is needed at all transit stops to accommodate boarding and alighting. Where the curb-adjacent sidewalk is in a commercial district, a minimum of 8-ft is preferred to accommodate pedestrian volumes and passenger access from parked vehicles on street.
19.3.2.1.2 Uncurbed Roadways
The same width requirements for the pedestrian zone apply to sidewalks on uncurbed roadways. In these cases, sidewalk should typically be placed between the ditch and the ROW line, not between the ditch and edge of the vehicular travelway. See .
An Uncurbed Roadway. ( click in image to see full-size image)
Figure 19-6: An Uncurbed Roadway
19.3.2.2 Buffer (Furniture) Zone
For pedestrian comfort, especially adjacent to high-speed traffic, it is desirable to provide a buffer (commonly called a furniture zone in urbanized areas), between the vehicular travelway and the pedestrian zone.
19.3.2.2.1 Curbed Roadways
On curbed roadways, the buffer is the space between face of curb and the edge of the pedestrian zone. Pedestrian zone placement immediately adjacent to the curb should be avoided where at all possible. Buffers provide space for other operational needs in the ROW, including sign posts, bus stops, parking meters, utility connections, light poles, and other appurtenances. They also provide space for plantings and other landscape development which enhance pedestrian comfort through providing shade and a greater sense of buffering and protection from adjacent traffic. Refer to TXDOT’s for appropriate plant selection and application. Buffers can also allow the pedestrian zone to continue at a constant grade across driveways as described in and provide for much better curb ramp designs at intersections.
While wider clear zones are appropriate for freeways and high-speed roadways, the recognizes that there are practical limitations to clear zones on lower-speed curbed streets. See for clear zone guidance. In urban, urban core, suburban, and small-town rural settings where pedestrian activity is expected, traffic speed is generally lower, and, depending on the context, roadway design may incorporate street furniture and/or plantings to create a sense of enclosure. This provides a traffic calming effect, which may increase comfort and safety for vulnerable road users. For curb and gutter sections, the buffer zone should be at least 4-ft wide measured from face of curb, although wider buffer space is preferable. For roadways with higher speed traffic, particularly those with speeds over 35mph, designs should consider providing additional buffer width to protect pedestrians from vehicle traffic and provide a more comfortable walking environment. The respective desirable clear zones from would be the desirable buffer width.
19.3.2.2.2 Uncurbed Roadways
On uncurbed roadways, the buffer zone is defined as the space between the edge of the vehicular travel-way pavement and the edge of pedestrian zone sidewalk pavement. The minimum buffer zone is 10-ft for both low- and high-speed conditions. The desirable buffer would be the respective desirable clear zone values from in the RDM.
This space is often the location of drainage ditches. If the ditch has a backslope of 3:1 or steeper, a separation of at least 2-ft should be provided between the top of slope and the edge of pedestrian zone pavement.
At driveways, bus stops, mid-block crossings, and anywhere else where a pedestrian or bicyclist would need to access the sidewalk/sidepath, an at-grade crossing of the ditch is required and may be provided through use of a sidewalk bridge, culvert, trench drain, or other means.
19.3.2.3 Frontage Zone
The frontage zone is the area between the pedestrian zone and the property line, typically applicable in areas with buildings directly adjacent to the ROW line.
19.3.2.3.1 Curbed Roadways
Frontage zone width may vary between 1-ft and 2.5-ft depending on building setback requirements and adjacent land uses. A 1-ft frontage zone (resulting in the pedestrian zone being 1-ft off the property/ROW line) provides room for maintenance space. With the 1-ft space, a construction easement will not be necessary if sidewalk maintenance needs to occur. In downtown areas, wider frontage zones may be considered for accommodation of commercial uses such as product displays and outdoor dining seating.
19.3.2.3.2 Non-Curbed Roadways
Typical land use context for non-curbed roadways would not necessitate a frontage zone other than for providing maintenance space. Setbacks may effectively function as frontage zones in these areas, separating the paved pedestrian zone from adjacent structures on private property.

19.3.3 Shared Use Paths

A shared use path is defined as a multi-use path designed for use by bicyclists and pedestrians, including pedestrians with disabilities. Shared use paths are physically separated from motor vehicle traffic by an open space or barrier and are either within the highway ROW (commonly referred to as sidepaths) or within an independent ROW.
Shared use paths are used by pedestrians and must meet the accessibility requirements of the ADA and be designed to conform to the . Where pedestrian and bicycle travel are accommodated on separate pathways, only the pedestrian pathway must meet the requirements of the above guidelines. See , for more information on shared use paths.
19.3.3.1 Cross Slope
See for information regarding the accessibility requirements related to cross slope.
19.3.3.2 Grade
See for information regarding the accessibility requirements related to grade. Shared use paths (on an independent alignment from the roadway) may only exceed 5 percent maximum grade at overpasses and underpasses, where the grade may be designed with a series of ramps and landings. See .
If the path is at or approaching 5 percent for a significant length (1000-ft or more), this sustained grade would be quite noticeable for a bicyclists or wheelchair user and maximum grade of 3 to 4 percent should be considered. At locations with sustained lengths of grades of 5 percent or more, level landings within the shared use path can be provided to provide periodic resting spaces for pedestrians. These should be designed to:
  • Permit users to stop and periodically rest within a level area (graded to 2% or less in all directions);
  • Be as wide as the shared use path, with a landing length of at least 6 feet;
  • Provide smooth grade breaks using vertical curve design criteria for shared use paths; and
  • At locations where stopped users within the path are likely to create conflicts with other users of the path, level-graded pull-outs should be considered.
Spacing of level landings should consider the sustained length of the grade and the steepness of the grade. Engineering judgement will be required to determine landing spacing, but consideration should be given to travel time between landings with landings located at evenly spaced intervals.
Alternately or in addition to a lower sustained grade, level-graded pull-outs (or rest areas) could be provided at strategic locations for users to get out of the travel path to pause or rest, or resting intervals of flatter grades may be provided. Where level pull outs are provided, they should be designed to:
  • Permit users to stop and periodically rest within a level area (graded to 2% or less in all directions) outside the path of travel;
  • Avoid abrupt grade breaks with smooth vertical curves at transition meeting shared use path vertical curve design guidance;
  • Be a minimum of 6 feet by 6 feet in dimension; and
  • Consideration should be given to providing seating within this space that meet ADA requirements.
Designers may also consider the provision of accessible pedestrian handrails located at the edge of the path to assist pedestrians in traversing steeper grades. See for guidance regarding protective rails adjacent to steep slopes.
Provision of a handrail may impact shared use path width. See for information regarding the impact of handrails on path width.
19.3.3.3 Additional Requirements
More information on shared use paths can also be found in .

19.3.4 Linear Pedestrian Facility Design Criteria

shows design criteria for linear pedestrian facilities. These design values may be adjusted based on the performance based practical design evaluation as discussed in . The previous and subsequent subsections in this chapter provide detailed discussions for each design element and factors that can influence these values.
Table 19-1 Design Values for Linear Pedestrian Facilities
Design Element
Minimum or Maximum
Desirable
Reference
Pedestrian Access Route (PAR) (e.g. Sidewalk)
Clear Width1
5-ft
6-ft to 8-ft
Buffer Zone Width (Curbed Roadways)
4-ft from FOC
6-ft or more from FOC
Buffer Zone Width (Uncurbed Roadways)
10-ft from Edge of Pavement
Desirable Clear Zone Width
Frontage Zone Width (Curbed Roadways)
0-ft
1-ft or more
Frontage Zone Width (Uncurbed Roadways)
See 19.3.2.3.2
Maximum Cross Slope
2%
1.5%
Maximum Pedestrian Crossing Cross Slope at Intersections
5%
2% or less
See and 19.6
Maximum Longitudinal Grade (Adjacent to Roadway / Curb)
Must not exceed general grade of the roadway
Maximum Longitudinal Grade (Independent Alignment)
5%
Obstacles and Protruding Objects
Shared Use Path (SUP)
See 18.3 and 18.4.1
Note
1. The clear width of a PAR may be reduced to 4-ft minimum for short distances, including across driveways, but passing spaces must be provided at intervals of 200-ft maximum. Passing spaces must be 5-ft minimum by 5-ft minimum. A design variance will be required if this criteria is not met.