If we implement Streets for Living ideas properly, ie, use streets for everything with less emphasis on straight lines/ rigid 4.8m a+ 5.5m width Highways with 2m pavements and half battered kerbs and segregation then the motorists have to drive more slowly as there are more obstacles. 20mph would be a safe maximum speed- life isn't all about the car and getting somewhere faster then the person next to you at the traffic lights... and we shouldn't force everyone to accept the existing situation just because there are some nutters around- there would be regardless of the law.