I have a very simple idea. Have transmitters in each speed zone that sends signals out. The computer in your car, and they all have one these days, could be set up to receive these signals. It would take a while before all cars were set up but it would work. When you car exceeds the speed limit by say 5kph the horn would start to blare and the head lights would flash. There is only one real reason for speeding and that is if you are taking someone to a hospital in a hurry, so the police would automatically know what is going on and lead the way. Of course this would cost the government a fortune in lost income from fines so it would never fly. It's about the money. An alternative would be a $5K fine for the first speeding ticket and lose your license for life after the second. Either idea would end speeding pretty much but kill government income too. Combine the two for maximum effect. If speeding is the killer that police claim, then these ideas have merit. If there is no merit, then the whole thing is just a money grab.
I too have heard stories of high speed crashes of police interceptors. Causing an accident to prevent one isn't exactly brilliant thinking. I don't care how fast your car is, it's pretty hard to outrun a police radio so there really isn't much reason for all the high speed chases. Then again, what would a hick from Omemee know?