Lynn B. Jarman
|October 24, 2002|
ACCESSIBILITY IN THE PUBLIC RIGHT-OF-WAY DRAFT GUIDELINES
(Response to the Access Board’s request for review and comment)
Salt Lake City Public Services has reviewed the proposed guidelines and respectfully submits the following recommended revisions and statements of concern:
1102.3, 1111.3 Alternate Circulation Path
Location. The alternate circulation path shall parallel the disrupted pedestrian access route, on the same side of the street.
Recommended Revision: The alternate circulation path shall parallel the disrupted pedestrian access route, on the same side of the street, unless in the judgment of the engineer, significant pedestrian safety issues exist, then the alternate circulation path shall be provided on the opposite side of the street.
1102.14 On Street Parking. Where on-street parking is provided, at least one accessible on-street parking space shall be located on each block face and shall comply with 1109.
Concern: Block lengths are not consistent across the country; the ratio of accessible stalls to non-accessible stalls will vary from city to city based on the standard block length. The proposed guideline does not clearly define whether the requirements apply to all block faces within a city, or only those locations with pavement marked stalls. The cost to identify accessible stalls on all block faces, including residential areas would be extreme.
1104 Ramps and Blended Transitions
122.214.171.124 Running Slope
EXCEPTION: A parallel curb ramp shall not be required to exceed 15 feet (4570 mm) in length.
Recommended Revision: A parallel curb ramp shall not be required to exceed 16 feet in length.
(The proposed minimum pedestrian access width is 48 inches; therefore, the common sidewalk scoring pattern would occur every 48 inches. Based on this pattern, the logical “not to exceed length” should be a multiple of 4 feet. In this case, a parallel ramp should not be required to exceed 16 feet.)
1104.3.2 Detectable Warnings (see 1108)
1105 Pedestrian Crossings
1105.2.2 Cross Slope. The cross slope shall be 1:48 maximum measured perpendicular to the direction of pedestrian travel.
Concern: This requirement will create “tabled areas” in the roadway, potentially creating vehicular traffic hazards, particularly in areas where roadways have steep running slopes.
1105.3 Pedestrian Signal Phase Timing. All pedestrian signal phase timing shall be calculated using a pedestrian walk speed of 3.0 feet per second (0.91 m/s) maximum. The total crosswalk distance used in calculating pedestrian signal phase timing shall include the entire length of the crosswalk plus the length of the curb ramp.
Recommended Revision: All pedestrian signal phase timing shall be calculated using a pedestrian walk speed of 3.0 feet per second (0.91 m/s) maximum. The total crosswalk distance used in calculating pedestrian signal phase timing shall include the entire length of the crosswalk plus the length of the curb ramp and additional distance, if any, to the pedestrian signal device.
Concern: Some consideration has been given to a walk speed of 2.5 feet per second. Walk speeds less than 3.0 feet per second would create significant vehicular traffic delay issues and environmental pollution concerns.
1105.5 Pedestrian Overpasses and Underpasses
1105.5.3 Approach. Where the approach exceeds 1:20, the approach shall be a ramp 48 inches (1220 mm) minimum in width and shall comply with 405. Where the rise of a ramped approach exceeds 60 inches (1525 mm), an elevator complying with 407, or a limited-use / limited-application elevator complying with 408 shall be provided.
Concern: Overpasses and underpasses exceeding the maximum stated approach rise should not require the installation of an elevator. The extreme cost for installation, maintenance, and security makes this requirement an unjustifiable burden on municipalities with limited resources. Efforts should be made to meet ramping requirements, but site conditions may present a situation of infeasibility.
1105.6.2 Signals. A pedestrian activated traffic signal complying with 1106 shall be provided for each segment of the crosswalk, including the splitter island. Signals shall clearly identify which crosswalk segment the signal serves.
Concern: Installation of pedestrian signals at each roundabout crossing negates the intended benefits of installing a roundabout. Additional signalization does not always result in greater pedestrian safety. Instead of requiring signals at all roundabouts, local engineers should evaluate roundabout installations to determine which locations would logically benefit from the installation of pedestrian signals.
1105.7 Turn Lanes at Intersections. Where pedestrian crosswalks are provided at right or left turn slip lanes, a pedestrian activated traffic signal complying with 1106 shall be provided for each segment of the pedestrian crosswalk, including at the channelizing island.
Concern: Additional signalization does not directly equate to improved pedestrian safety. Well-engineered slip lanes (channelized turn lanes) with properly established pedestrian crossing times will result in improved safety. The slip lane design may or may not include additional signalization; the engineer should make this decision.
1108 Detectable Warning Surfaces
Concern: Considerable concern appears to exist from both the professional and public sectors regarding the installation of truncated domes. The major organizations representing the blind community cannot come to agreement on this issue. Initial installation costs and ongoing maintenance costs, especially in areas experiencing ice and snow, present real concerns regarding this proposed standard. Further evaluation is needed to ensure implementation of this guideline will provide the desired benefit.
Salt Lake City Public Services appreciates the opportunity to provide comment on the proposed guidelines. The Board’s efforts in this matter are admirable. Hopefully, with feedback from local jurisdictions, guidelines meeting the true needs of our communities will be developed and adopted by those enforcing construction standards.
Lynn B. Jarman
Salt Lake City Public Services
Planning and Programming Manager
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