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Chapter 3 -United States Ac i i i i Board Pa e 2 of 12 R301.4.3 Supported Slope.Where the walkway of a pedestrian access route is supported by a structure,it shall comply with R305.5. Advisory R301.4.3 Supported Slope. This provision covers pedestrian access routes on bridges,overpasses,underpasses and similar facilities. R301.5 Surface.The surface of the pedestrian access route shall be firm, stable and slip resistant. Advisory R301.5 Surface. The U.S. Department of Justice ADA regulations require that the usability of accessible features be maintained(28 CFR §35.133 and§36.211). R301.5.1 Vertical Alignment.Vertical alignment shall be planar within curb ramp runs, blended transitions,landings,and gutter areas within the pedestrian access route,and within clear spaces required for accessible pedestrian signals,street furniture,and operable parts.Grade breaks shall be flush.Where the pedestrian access route crosses rail tracks at grade,the surface of the pedestrian access route shall be level and flush with the top of the rail at the outer edges of the rail.The surface between the rails shall be aligned with the top of the rail. 8301.5.2 Surface Discontinuities.Surface discontinuities shall not exceed 13 mm(0.50 in)maximum.Vertical discontinuities between 6.4 mm (0.25 in)and 13 mm(0.5 in)maximum shall be beveled at 1:2 minimum. The bevel shall be applied across the entire level change. Advisory R301.5.2 Surface Discontinuities.Surfaces with individual units laid out of plane and those that are heavily textured,rough,or chamfered, will greatly increase rolling resistance and will subject pedestrians who use wheelchairs,scooters,and rolling walkers to the stressful(and often painful)effects of vibration.It is highly desirable to minimize surface discontinuities;when discontinuities on the pedestrian access route are unavoidable,they should be widely separated. 8301.7 Horizontal Openings 8301.7.1 Walkway Joints and Gratings.Openings shall not permit passage of a sphere more than 13 mm(0.5 in)in diameter.Elongated openings shall be placed so that the long dimension is perpendicular to the dominant direction of travel. R3O1.7.2 Clearances at Elevator and Platform Lift Silts.Clearances between elevator car platform sills and associated hoistways and between a platform lift sill and any landing shall comply with the applicable requirements in sections 407.4.3,408.4.3,and 410.4 of Appendix D to 36 CFR part 1191(the ADA and ABA Accessibility Guidelines). R3O1.7.3 Flangeway Gaps at Non-Freight Rail Crossings.Openings for wheel flanges at pedestrian crossings of non-freight rail track shall be 64 mm(2.5 in)maximum. 8301.7.4 Flangeway Gaps at Freight Rail Crossings.Openings for wheel flanges at pedestrian crossings of freight rail track shall be 75 mm(3 in) maximum. �= R302 Alternate Circulation Pa 11302.1 General.Alternate circulation paths shall complyR302' shall contain a pedestrian access route complying with R30 Advisory R302.1 General. Temporary routes are alterations to an e veloped pedestrian environment an equine eve the, lmum accessibility feasible con` R302.2 Location.To the maximum extent feasible,the alternate circulation path shall be provided on the same side of the street as the disrupted route. http://www.access-board.gov/guidelines-and-standards/streets-sidewalks/public-rights-of-... 12/15/2014