Question to the Department for Transport:

To ask Her Majesty's Government what assessment they have made of the effectiveness of traffic lights on roundabouts reducing congestion across England.

Provision of traffic lights is the responsibility of each local traffic authority. It is for them to decide if lights are required at roundabout junctions on their network, taking into account local circumstances such as accident records, traffic flows and road layout.

The Department for Transport recommends local authorities regularly review sites to revise timings as needed and to ensure the use of signal control is still appropriate.