I thought this book was great. (I bought it for $10 and read it on my Amazon Kindle.) It was fascinating, and very relevant to cyclists as well as motorists. Lots of good anecdotes, but it also summarizes the best studies. (Who knew they spent so much time studying all this stuff?) It is quite up-to-date, including info on the recent study by the guy who tried to find out if cars passed closer if you were wearing a helmet or not (or were trying to pass as a woman by wearing a wig!)
It's a bit discouraging though. The more money they spend to improve things, the worse they get. The more you try "logical" or "common-sense" solutions you find out they have bad unintended consequences. One of the most interesting books I've read in a long time.