Question to the Department for Transport:

To ask the Secretary of State for Transport, what recent assessment he has made of the effectiveness of 20mph zones.

The Department for Transport published a comprehensive three-year evaluation of the effect of 20mph limits, which are 20mph schemes relying only on signage, on 22 November 2018. The evaluation considered collision and casualty statistics for all road user types. It showed that typically they resulted in less than a 1mph reduction in average speed.