In actuality, a Department for Transport study undertaken in 2000 shows that easy traffic management direction such as decreasing road speed to 30mph in built-up areas can decrease the number of people severely injured or killed in traffic accidents on village roads by 50%.
However, less than one in five local governments has implemented or intends to implement methods of speed decrease. Why would local governments ignore such a potent time-management instrument?
There are a variety of reasons for this, but the largest of these is the strong feeling most people have against using speed humps. If there's one issue that has made a united front across the political spectrum, it is speed humps.
Vertical deflections are those least enjoyed by the general public. They include any street construction that increases the surface of the street – speed humps, raised intersections, rumble strips and rate tables are examples. There are numerous inventions on speed humps, including a 'smart' hump that senses the speed of the oncoming vehicle and deflates itself if the rate is low enough to pass it over without jolting.
Horizontal changes include traffic circles and chicanes that create s-shaped pathways between curbs and obstacles.
Roadway narrowing controls traffic by diverting traffic from one lane into another, or by creating a narrower lane for traffic to pass. The methods used include widening walk paths and including cyclist lanes to existing roadways.
Closures block traffic from cutting through intersections. Closures are generally only used after all other methods have failed to slow traffic through a neighborhood.