> Even if you make everyone drive at 20MPH inside cities, you'll still have people exceeding that limit and getting into accidents. The key is how you make eve

> Even if you make everyone drive at 20MPH inside cities, you'll still have people exceeding that limit and getting into accidents. The key is how you make everyone drive 20mph. It's been pretty well established that speed limits do a horrible job of forcing drivers to slow down and are even counter productive since a small minority of drivers will actually follow them. This creates a delta between them and the majority of drivers and deltas between drivers, more so than absolute speed, contribute to an increase in accidents. However you can actually slow drivers down by making the lanes narrower. Drivers may complain, object and lobby to revert back to wider lanes, but they'll actually slow down until that happens.