The city tried to implement that kind of system here and the whole community bitched about it and the city never went through with it. I don't know how accurate this is but there were some studies out there showing that in some places, traffic accidents went up after implementing the cameras because people were looking at the cameras instead of driving correctly. Once that information leaked out, it was pretty hard for the city counsel to argue the merits, even if it is a cash cow for the city.
