Comment Re:Maybe because they block traffic? (Score 1) 241
For the enforced speed limits to work, cars need to get better at determining what the speed limit is. A map can potentially tell you the normal speed limit, but this might be reduced by roadworks etc. So the car has to actually read road signs. And mine is great at picking the wrong limit from signs. This includes things like speed limit signs that are a bit grubby, not seeing signs that are at a bit of an angle, signs on side roads or parallel roads, and the speed limits on the back of lorries.