[nagdu] Audible Traffic Signals

[Julie J]

I was asked questions last night about audible pedestrian signals during my 
presentation.  I of course know what they are and generally how they work. 
However I have never actually had the experience of crossing a street that 
has them.  I'm not convinced that we really need them here where I live, but 
I'd like to have some facts about APS.  Is there some authoritative source 
that outlines when they are necessary?

The particular intersection that everyone but me is concerned about is a not 
extremely busy two way street  that intersects a moderately busy one way. 
I cross it twice a day, to work and back.  Sometimes I wait a couple of 
cycles to get it figured out, but generally I cross at my first opportunity. 
It's not a particularly easy intersection, but I don't feel unsafe either.

Thoughts?
Julie