How speed limits are enforced in America always bothers me, because there is this great disconnect between planners and everybody else.<p>Planners think of speeds of roads being intrinsic to the design of the road thus if a people are going to fast on a road, you need to change it by narrowing it or putting in bumps or something.<p>The other side of this is to think of speeds of a road as based on whats around it, so if there are a lot of houses on a road, people should go slower so you don't hit people so you put in speed limits.<p>But the problem with limits is that since the road feels faster then the the speed limit, people just go faster then the limit, but since changing the road is a lot more expensive then just putting up speed limits that tool is used a lot less frequently.