20mph MAX speed in an area with traffic lights, junctions, turnings and people makes sense to me - should mean smoother traffic flow, easier movements, less congestion. Many of us put our foot down through a clear stretch just to sit in frustration at the long queue at the lights ahead. But maximum speed isn't the same as average speed. And however brilliant a driver you are, if someone or something jumps out in front of you, the speed you are going will affect the outcome. 20mph MAX in a built up area doesn't compare to cruising on the motorway at x or y mph (do people really think they drive at constant speed on journeys in this area?!) Average speed in rush hour is around 7mph at the moment. Reducing the max speed limit is unlikely to reduce average journey speed but will make the streets safer and calmer if enforced.