Speeds
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.
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Browse individual statistical tables within this series
Notes and guidance
Free flow speed statistics are derived from 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 and vehicle types. The term ‘built-up’ is used to describe roads on which a 40 mph 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 under ’Related information’ below.
National Statistics
All of the statistics published in this series are National Statistics.
Pre-release access list
This list details the post holders that are given pre-release access to speeds publications for up to 24 hours prior to release.
Technical information
Further information on the Free flow speeds series.
- Free flow vehicle speeds: notes and definitions (PDF – 30 KB)
- Free flow vehicle speeds: methodology note (PDF – 33 KB)
Information on free flow speeds statistics for previous years which were published on the Department’s old website can be found at:
Related information
Contact us
- roadtraff.stats@dft.gsi.gov.uk
- Phone: 020 7944 3095
