Question to the Department for Transport:

To ask the Secretary of State for Transport, what recent assessment his Department has made of the effectiveness of 20mph speed limits introduced by local authorities.

The Department has not undertaken any recent assessments on 20mph roads. We published a comprehensive three-year evaluation of the effect of 20mph signed-only limits on 22 November 2018; this may be found here.

The headline findings were:

• There is insufficient evidence to conclude that that there has been a significant change in collisions and casualties following the introduction of 20mph limits in residential areas.
• In one city centre case study there has been a significant reduction in collisions and casualties.
• 20mph limits are supported by the majority of residents and drivers