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R301.7.1 Walkway Joints and Gratings. Openings shall not permit passage of a <br />sphere more than 13 mm (0.5 in) in diameter. Elongated openings shall be placed <br />so that the long dimension is perpendicular to the dominant direction of travel. <br />R301.7.2 Clearances at Elevator and Platform Lift Sills. Clearances between <br />elevator car platform sills and associated hoistways and between a platform lift <br />sill and any landing shall comply with the applicable requirements in sections <br />407.4.3, 408.4.3, and 410.4 of Appendix D to 36 CFR part 1191 (the ADA and <br />ABA Accessibility Guidelines). <br />R301.7.3 Flangeway Gaps at Non -Freight Rail Crossings. Openings for wheel <br />flanges at pedestrian crossings of non -freight rail track shall be 64 mm (2.5 in) <br />maximum. <br />R301.7.4 Flangeway Gaps at Freight Rail Crossings. Openings for wheel <br />flanges at pedestrian crossings of freight rail track shall be 75 mm (3 in) <br />maximum. <br />R302 Alternate Circulation Path <br />R302.1 General. Alternate circulation paths shall comply with R302 and shall contain a <br />pedestrian access route complying with R301. <br />Advisory R302.1 General. Temporary routes are alterations to an existing developed <br />pedestrian environment and are required to achieve the maximum accessibility feasible <br />under existing conditions. <br />R302.2 Location. To the maximum extent feasible, the alternate circulation path shall be <br />provided on the same side of the street as the disrupted route. <br />Advisory R302.2 Location. Where it is not feasible to provide a same -side alternate <br />circulation path and pedestrians will be detoured, section 6D. 02 of the MUTCD specifies <br />that the alternate path provide a similar level of accessibility to that of the existing <br />disrupted route. This may include the incorporation of accessible pedestrian signals <br />(APS), curb ramps, or other accessibility features. <br />R302.3 Protection. Where the alternate circulation path is exposed to adjacent <br />construction, excavation drop-offs, traffic, or other hazards, it shall be protected with a <br />pedestrian barricade or channelizing device complying with R302.4. <br />Advisory R302.3 Protection. When it is necessary to block travel at the departure curb to <br />close a crosswalk that is disrupted by excavation, construction, or construction activity, <br />care must be taken to preserve curb ramp access to the perpendicular crosswalk. This <br />may require additional pedestrian channelization if only a single diagonal curb ramp <br />33 <br />