True, but in the UK laws and Policing are supposed to be enacted 'by consent' or, in other words, generally agreed by most to be in the interests of the people. Speed limits are an interesting case, because it's not true that 'speed kills' in and of itself. Bad driving, carelessness, medical trauma, bad luck, catastrophic failures - all these can be contributory factors but what is interesting is the lack of any incontrovertible evidence that enforcing speed limits makes any real difference.