I think we need to stick with it for a while. After getting a fine or two most people will adjust and start treating the speed limit as the upper bound.

Agree that the lottery is silly though. I would give people a free hit a year. You get a warning saying, this one is free if you don't break the limit again. If you do, pay both fines.

Also index the fines to income.

We can kill speeding. It's just a matter of resolve and time. It'd save a lot of lives.