Statistically, the most dangerous roads are those in town where the speed limit is 30. The safest roads are motorways, which have a limit of 70… It seems to me that the best solution is to impose a minimum speed limit of, say, 175mph. Because if you are travelling through suburbia at this speed, it is extremely unlikely that you would retreat into a daydreamy world of work, phone calls and Colin Firth coming out of a lake with a wet shirt.