Having picked up 6 speeding points in 6 days I am anxious to stay within the law. Is there any technology (sat nav or otherwise) that will warn me if I am exceeding the limit whatever it is where I am? I have tried a Tom Tom: but it only warns you when you exceed the limit by about 7 mph - more latitude than the police give you; even worse it does not recognize any speed limit on some roads including A roads. Is there any reason why an electronic signal could not be passed to a vehicle when it passes any change in speed limit and the car have a device to warn you when you go over that speed? If the authorities were concerned with speed (as a opposed to speeding fines) they would introduce this.