Free flow vehicle speeds statistics information.
These statistics relate to free flow vehicle speeds on British roads. Free flow vehicle speeds provide information on the speeds at which drivers choose to travel and their compliance with speed limits, but should not be taken as estimates of actual average speed across the road network.
An index sheet of all the free flow speeds statistical tables is available.
Average speed statistics are available from road congestion and reliability statistics.
Free flow speed statistics are produced by monitored traffic speeds at about 100 sites using automatic traffic counters (ATC), deliberately located where external factors which might restrict driver behaviour are not present.
Statistics are presented by different road types and by different vehicle types. The term ‘built-up’ is used to describe roads on which a 40 miles per hour or lower limit applies; the term ‘non-built-up’ describes all other roads.
National administrations in England, Scotland and Wales are responsible for setting speed limits on motorways and trunk ‘A’ roads. Local authorities have the power to impose or vary speed limits on principal roads and on all other local roads. Details of speed limits by vehicle for different road categories can be found below.
Further technical information on the free flow speeds:
We continuously review the content of these statistics to ensure they are meeting users’ needs. A summary of the feedback we have received from users is available in Meeting customers’ needs: users and uses of road traffic statistics and data.
We continue to welcome any feedback on these statistics.
Road traffic and free flow speeds statistics enquiries
Public enquiries 020 7944 3095
All of the statistics published are National Statistics. Free flow speeds statistics was assessed by the UK Statistics Authority and confirmed as National Statistics in February 2013.
Pre-release access list
The post holders given access to these statistics up to 24 hours prior to release are available in the Pre-release access lists for road traffic, speeds and congestion.