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Chapter 3 -United States Ac Board Pae 7 of 12' of Appendix D to 36 CFR part 1191(the ADA and ABA Accessibility Guidelines)and providing for independent operation. Advisory R305.5.2 Approach. This provision leaves the decision of type of accessible vertical access up to the jurisdiction. Long ramps can present difficulties for some persons with disabilities and may require snow clearance. Elevators or lifts entail a maintenance obligation. 8305.5.3 Stairs.Stairs shall comply with R407. R305.5.4 Escalators.Escalators shall comply with sections 6.1.3.5.6 and 6.1.3.6.5 of ASME A17.1(incorporated by reference;see R104.2.3)and shall have a clear width of 82 cm(32 in)minimum. R305.6 Roundabout Intersections.Where pedestrian facilities are provided at roundabout intersections,they shall comply with R305.6 and shall contain a pedestrian access route complying with R301. R305.6.1 Separation.If walkways are curb-attached,there shall be a continuous and detectable edge treatment along the street side of the walkway wherever pedestrian crossing is not intended.Where chains, fencing,or railings are used,they shall have a bottom element 38 cm(15 in)maximum above the pedestrian access route. Advisory R305.6.1 Separation.Because the pedestrian crossings are located off to the side of the pedestrian route around the street or highway and noise from continuously circulating traffic may mask useful audible cues. Carefully delineated crosswalk approaches with plantings,low enclosures, curbs,or other defined edges can be effective in identifying the crossing location(s).European and Australian roundabout intersections extend a 6- cm(24-inch)width of tactile surface treatment from the centerline of the ramp or blended transition across the full width of the sidewalk to provide an underfoot cue.Several manufacturers make a surface of raised bars for this use. The detectable warning surface should not be used,since it indicates the edge of a street or highway. Schemes that remove cyclists from the circulating street or highway by means of a ramp that angles from the curb lane to the sidewalk and then provide re-entry by means of a similar ramp beyond the pedestrian crossing may provide false cues about the location of a crossing to pedestrians who are using the edge of the sidewalk for wayfinding.Designers should consider ways to mitigate this hazard. R305.6.2 Signals.At roundabouts with multi-lane crossings,a pedestrian activated signal complying with R306 shall be provided for each segment of each crosswalk,including the splitter island.Signals shall clearly identify which crosswalk segment the signal serves. Advisory R305.6.2 Signals. There are many suitable demand signals for this application. Crossings at some roundabout intersections in Australia and the United Kingdom incorporate such systems,in which the driver first sees a flashing amber signal upon pedestrian activation and then a solid red while the pedestrian crosses to the splitter island(there is no green). These types of signals are also used in some U.S. cities at pedestrian crossings of arterial street or highways. The pedestrian pushbutton should be identifiable by a locator tone,and an accessible pedestrian signal incorporated to provide audible and vibrotactile notice of the gap created by the red signal. if properly signed,it need only be used occasionally by those who do not wish to rely solely on visual gap selection. Roundabout intersections with single-lane approach and exit legs are not required to provide signals. R305.7 Channelized Turn Lanes at Intersections.Where pedestrian crosswalks are provided at multi-lane right or left channelized turn lanes at intersections with pedestrian signal indications,a pedestrian activated signal complying with R306 shall be provided. http://www.access-board.gov/guidelines-and-standards/streets-sidewalks/public-rights-of-... 12/15/2014