So every new vehicle is going to be electric (200mile limit then 8 hours charge time) and cant go over certain speed limits
its going to take a week to travel 500 miles when now it can be done in a day!
even shorter journies will become longer with electric cars as you need to wait to charge them up
Its just not practical
I do like the idea of making everyone stick to the limit though more so in built up areas not so on motorways