The Department for Transport is not responsible for speed camera deployment which is entirely a matter for local road safety partnerships. Evidence shows average speed cameras are effective at reducing road casualties and reducing the speed of all types of vehicle. Traffic law enforcement devices require type approval by the Home Office before they can be used. At the moment there are four average speed cameras going through the type approval process. As type approval depends on the outcome of tests and manufacturers’ reactions, it is not possible to guarantee that any particular device will be successful or that type approval will be granted within any specific time scale.