Sorry but everyone will still speed. I do now, and I still would. Lowering the speed limit would not be a good solution. It didn't work back then, it won't work now. Making cars more efficient at any speed is a better answer. Also driver characterisitcs. I love the 10-20 mph up and down drivers. 60 one min 75 the next 62 ,79,67,71, pass, slow, speed up, cant follow a regular driving pattern. that I think wastes more gas braking and revving to gain speed then me going 80 the whole time. apparently the lady on the phone in her X5 that was all over the road on the way to work today hasnt discovered her cruise control yet.