well to be honest, its just a common sense thing, if you can see you cant go a certain way and its telling you to, then you don't. but roads change a lot. when ya travel all over the country the new and changed roads add up. but i still got on fine with it, mainly it just meant i didn't know new housing estates and stuff, get the speed camera's on it though mate, there well worth it. i now have no points on my licence since having camera.s on it for 4 year. i used to hover around 6 points