The likelihood of severe injury or death goes down dramatically with lower speeds. A reasonable speed is a variable concept, but certainly minor residential str

The likelihood of severe injury or death goes down dramatically with lower speeds. A reasonable speed is a variable concept, but certainly minor residential streets should never have speeds in excess of 40 kmh (25 mph). My city recently reduced the limit to 40 kmh on all such streets. Now they just have to go the other 95% of the work - physically designing the streets for their posted limits, so that the option of speeding is simply removed (unless you're okay with regularly spending money at a body shop).