Question to the Department for Transport:

To ask the Secretary of State for Transport, whether he has provided guidance to local authorities on using all-day 85th percentile speeds when determining road speed limits.

The Department for Transport has issued guidance designed to make sure that speed limits are appropriately and consistently set while allowing for flexibility to deal with local needs and conditions.

The guidance asks that local authorities have regard for it, and notes that the 85^th percentile speed as well as mean speed are the most commonly used measures of actual traffic speed.