§ Mr. Greg Knight
To ask the Secretary of State for Transport if he will take powers to prevent local authorities and elected mayors from altering the timing on traffic lights other than for the purpose of improving traffic flows commensurate with safety. 
§ Mr. Spellar
The timing of traffic signals depends on many factors, including the layout of junctions, the movements and types of vehicles to be accommodated at the junction and the proximity of junctions to each other, as well as the numbers of vehicles and pedestrians. We look to local authorities and elected mayors to provide for the safe and efficient passage of all road users and to ensure the smooth flow of traffic.