I was struck by their camera system, it would be interesting to have traffic cameras that recorded but did not attempt to enforce traffic violations. Then if you're in court for something there might be an additional piece of information about how safe of a driver you are given how often you've been recorded violating various traffic rules.

In Sunnyvale there are a number of the 'automatic' speed signs (they show you your speed and flash if it is over the limit) and on the streets near me they do seem to improve compliance when they are active. Of course given that they are two lane streets (one lane in each direction) one compliant driver can keep the entire block compliant :-).