http://jalopnik.com/5533260/why-street-signs-make-traffic-more-dang...
This is a bit of a lengthy article for Jalopnik, but I think it's one worth reading. I was going to post it when I first read it, but it slipped my mind. Today there was another post about a dangerous intersection in Budapest where the lights went out, accidentally testing the theory.
Basically, Hans Monderman was a traffic engineer who believed that designing shared spaces for cars, bikes, and pedestrians where the perception of danger was perfectly clear is safer than posting control devices to influence people's behavior. Studies at test sites seem to prove this to be correct.
a few excerpts (but read the whole thing, the bit on time v distance is interesting):
"....As I drove with Monderman through the northern Dutch province of Friesland several years ago, he repeatedly pointed out offending traffic signs. “Do you really think that no one would perceive there is a bridge over there?” he might ask, about a sign warning that a bridge was ahead. “Why explain it?” He would follow with a characteristic maxim: “When you treat people like idiots, they’ll behave like idiots."
"...As I watched the intricate social ballet that occurred as cars and bikes slowed to enter the circle (pedestrians were meant to cross at crosswalks placed a bit before the intersection), Monderman performed a favorite trick. He walked, backward and with eyes closed, into the Laweiplein. The traffic made its way around him. No one honked, he wasn’t struck. Instead of a binary, mechanistic process—stop, go—the movement of traffic and pedestrians in the circle felt human and organic."
"...A year after the change, the results of this “extreme makeover” were striking: Not only had congestion decreased in the intersection—buses spent less time waiting to get through, for example—but there were half as many accidents, even though total car traffic was up by a third. Students from a local engineering college who studied the intersection reported that both drivers and, unusually, cyclists were using signals—of the electronic or hand variety—more often. They also found, in surveys, that residents, despite the measurable increase in safety, perceived the place to be more dangerous. This was music to Monderman’s ears. If they had not felt less secure, he said, he “would have changed it immediately.”
"...I don't want traffic behavior, I want social behavior"
There's also a bit of info about early traffic engineering in the US, how it relates to the car, and why we have such a hurdle to get over if anything like this could even begin to be taken seriously here.
I'm skeptical, but intrigued.