By Alison Hill
Speed kills. The risks of injury and death when a cyclist or pedestrian is hit by a vehicle increases the faster the vehicle is travelling. A pedestrian hit at 40mph has a 31% chance of being of being killed; at 30mph that risk goes down to 7%: and at 20mph the risk is very low. One of the simplest and easiest ways to reduce injury to people who walk and cycle is to reduce the speed limit to 20mph.