National implementation, data - February 2024
Preliminary weighted mean speed (mph) changes on main through roads following the national 20mph default speed limit on restricted roads
These data are preliminary. Further post-implementation data are being collected during 2024, so post-implementation speeds presented here will be subject to change. For this reason, caution is recommended when interpreting. The data are representative of the areas monitored but may not be representative of all of Wales.
The data were collected on main through roads at 43 locations in nine settlements. All roads monitored had a 30mph speed limit before 17 September 2023 and a 20mph speed limit from 17 September 2023 onwards. All roads were largely free from physical restrictions that reduce traffic speeds at the time of monitoring.
- Speed changes 20mph national rollout preliminary
(A revised version of the preliminary weighted mean speed (mph) changes was published on 1 May 2024, following a correction in the calculations for Table 1) - Monitoring site maps
Compliance with the Code of Practise for Statistics:
Contact details for this report
Geospatial and Strategic Transport Analysis Unit
