Hi All:

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

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:

Tony Redington
Slow and Safe Multi-Laners!*

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