This report provides information on vehicle speeds on Welsh motorways, that is the A48(M), M4 and the M48 for April to June 2016.

Chart showing average speeds for the stretches of M4 in each local authority in Wales during the morning peak. Neath Port Talbot and Newport are the only local authorities where the average speed is below 60 mph in both directions.

Chart showing average speeds for the stretches of M4 in each local authority in Wales during the evening peak. The average speed in Monmouthshire, westbound was 33 mph. This was the slowest average speed for any time, direction or local authority.

Main points

  • Average speeds for the M4 were consistently above 60mph across four out of nine local authorities.
  • Slower average speeds were recorded in Neath Port Talbot and Newport for all directions, during the morning and evening peaks.
  • The A48(M) often saw quarterly average speeds under 60 mph during peak times. The westbound A48(M) routinely saw average speeds under 50 mph during the morning peak.
  • Average speeds on the M48 were consistent in each direction during morning peak hours, but lower westbound for the rest of the day.
  • Analysis suggests a small increase in the average speed on the M4 over the period covered by the data.

Note

The data for this report is taken from in-vehicle global positioning systems (GPS).

Reports

Vehicle speeds on Welsh motorways, April to June 2016 - Revised
, file type: PDF, file size: 2 MB

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Contact

Thomas Lines

Tel: 0300 025 9895

Media

Tel: 0300 025 8099