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My comments were just posted, about the second "comment" at the end of Rick and Ken's article (address below). Since AARP is a strong supporter of signal to roundabout conversions the ADA issue does need further consideration. My position for some time has been the mobility community needs to advocate for roundabouts for their constituency, including replacing signals with roundabouts, and push for raised crosswalks, shared space, or similar speed reduction measures to provide a modicum of safety for those with a severe visual disability, others with a disability served sufficiently without supplemental treatments at single lane roundabouts and most likely at two-laners.
Note you may not agree
with my post responding to "Patricia". My posts with the listserv, study and research paper for
Canadian Transportation Research Forum, etc., all point to signals as
being made obsolete for the disability community, including those with
severe visual disability. My thesis is those with severe visual
disability may be--and "may be" is stressed--served by a roundabout with
raised crossings (see the Orange County study) or other traffic calming
measures and/or shared space nodes. We need, as Gene suggests, valid statistical research here. But for the disability population as a whole, replacing
signals with roundabouts reduces injuries, injury severity, and
fatalities--that case is pretty much closed.
Reply to Patricia: "I agree with you, the basic single lane roundabout fails the small segment of those persons with a handicap with a severe visual disability. But the surprise comes from the fact shown by research supported by the mobility community that, essentially, signals are no longer safe for those with a disability of any kind, including those with a severe visual disability. Research tells us the vanilla basic single lane roundabout cuts walking mode serious and fatal injuries by about 90%--including for those with a disability. AARP advocates replacing signals with roundabouts in part for this very reason. The roundabout in combination with traffic calming--like raised crosswalks demonstrated by a mobility supported experiment--promises accessibility for those with a severe visual disability. And, "shared space" appears to meet a reasonable accessibility level. Until we get some valid data on disability injury rates and a separate breakdown of those with a severe visual disability we will not know for sure--but my suggestion would be to continue to replace signals with roundabouts. Note ADA does not require any special treatments at single lane roundabouts and none are being proposed, and ADA does not address "shared space" designs. Tony Redington Blog: TonyRVT.blogspot.com
Tony RedingtonBlog: TonyRVT.blogspot.com
OUR “INTERSECTION SAFETY BELT”
FOR ALL—THE ONE-LANE ROUNDABOUT & Compact Slow and Safe Multi-Laners!