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Chapter 3 -United States Acs Board Pa e 6-of 12 <br /> of truncated domes in a detectable warning surface should be aligned to be <br /> perpendicular or radial to the grade break between the ramp and the street <br /> for a 1.2 meter-wide(4.0 ft)width for each crosswalk served. <br /> R304.2.3 Rail Crossings.The detectable warning surface shall be located <br /> so that the edge nearest the rail crossing is 1.8 m(6 ft)minimum and 4.6 <br /> m(15 ft)maximum from the centerline of the nearest rail.The rows of <br /> truncated domes in a detectable warning surface shall be aligned to be <br /> parallel with the direction of wheelchair travel. <br /> 8.305 Pedestrian Crossings <br /> 8305.1 General.Pedestrian crossings shall comply with R305. <br /> 8305.2 Crosswalks.Crosswalks shall comply with R305.2 and shall <br /> contain a pedestrian access route that connects to departure and arrival <br /> walkways through any median or pedestrian refuge island. <br /> R305.2.1 Width.Marked crosswalks shall be 1.8 m(6 ft)wide minimum. <br /> R305.2.2 Cross Slope <br /> R305.2.2.1 Crossings with Stop Control.The cross slope shall be 2 <br /> percent maximum. <br /> R305.2.2.2 Crossings without Stop Control.The cross slope shall be 5 <br /> percent maximum. <br /> R305.2.2.3 Midblock Crossings.The cross slope at midblock crossings <br /> shall be permitted to be warped to meet street or highway grade. <br /> R305.2.3 Running Slope.The running slope shall be 5 percent maximum, <br /> measured parallel to the direction of pedestrian travel in the crosswalk. <br /> R305.3 Pedestrian Signal Phase Timing.All pedestrian signal phase <br /> timing shall be calculated using a pedestrian walk speed of 1.1 m/s(3.5 <br /> ft/s)maximum.The crosswalk distance used in calculating pedestrian signal <br /> phase timing shall include the entire length of the crosswalk. <br /> R305.4 Medians and Pedestrian Refuge Islands.Medians and <br /> pedestrian refuge islands in crosswalks shall comply with R305.4 and shall <br /> contain a pedestrian access route,including passing space,complying with <br /> R301 and connecting to each crosswalk. <br /> R305.4.1 Length.Medians and pedestrian refuge islands shall be 1.8 m <br /> (6.0 ft)minimum in length in the direction of pedestrian travel. <br /> Advisory 8305.4.1 Length. The edges of cut-throughs and curb ramps are <br /> useful as cues to the direction of a crossing. This should be considered when <br /> planning an angled route through a median or island. Curb ramps in <br /> medians and islands can add difficulty to the crossing for some users. There <br /> are many factors to consider when deciding whether to ramp or cut-through <br /> a median or island. Those factors may include slope and cross slope of road, <br /> drainage,and width of median or island. <br /> 8305.4.2 Detectable Warnings.Medians and pedestrian refuge islands <br /> shall have detectable warnings complying with R304 at curb ramps and <br /> blended transitions.Detectable warnings at cut-through islands shall be <br /> located at the curbline in-line with the face of curb and shall be separated <br /> by a 61 cm(2.0 ft)minimum length of walkway without detectable <br /> warnings.Where the island has no curb,the detectable warning shall be <br /> located at the edge of roadway. <br /> R305.5 Pedestrian Overpasses and Underpasses.Pedestrian <br /> overpasses and underpasses shall comply with R305.5. <br /> R305.5.1 Pedestrian Access Route.Pedestrian overpasses and <br /> underpasses shall contain a pedestrian access route complying with R301. <br /> 8305.5.2 Approach.Where the approach slope exceeds 5 percent,the <br /> approach shall be a ramp 1.2 m (4.0 ft)minimum in width complying with <br /> R406 or an elevator,a limited use/limited application elevator,or platform <br /> lift complying with the applicable requirements in section 407,408,and 410 <br /> http://www.access-board.gov/guidelines-and-standards/streets-sidewalks/public-rights-of-... 12/15/2014 <br />