It is so easy to accidentally wander above the speed limit and not realise it. If the police and government are serious about reducing the road toll then why can you still buy a car that will do more than 100kph ?
Answer : Because the police and government would miss out on millions of dollars of revenue each year if it was impossible to speed.
They would be better off to fix up some of the "patched up goat tracks" that they call roads to reduce the road toll.