I agree, I was almost mowed down by a Prius in a grocery store parking lot. I really think both drivers and pedestrians will have to learn better habits when in proximity with each other. I was walking back from breakfast this morning, when a mini-van driver, looking towards oncoming traffic, almost hit me. She emerged from a blind corner, due to hedges, and her minivan is already quiet. If I was on a bike, I wouldn't have stopped in time.When driving my (treehugger) daughter's Prius, it was eerily quiet and the driver had to be MUCH more alert to pedestrians, because they couldn't hear you coming. If sighted people are problematic, the visually challenged would be even moreso.
I really think it is going to be a re-education process for everyone, but I believe if the blind were able to buy a transponder, that would cause rolling vehicles around them to start beeping low tones, which beep faster based on proximity, then that should be sufficient.