Changes to the speed limit on the M4

The permanent 50mph limit with average speed enforcement between junctions 24 and 28 on the M4 will be live by Monday, March 15th.

The measure forms part of the Welsh Government’s approach to tackling congestion in the area as recommended by Lord Burns’ report published following the work carried out by the South East Wales Traffic Commission.

Over the next couple of weeks work will be undertaken to finalise the installation of the cameras and road signs. .

There will be night-time full closures of the east bound carriageway week commencing March 1st, followed by west bound full closures week commencing March 8th, from 20:00 – 06:00. Additional information about diversion routes and any disruption to the travelling public can be found on the Traffic Wales website and twitter.

The cameras will be operational and the mandatory 50mph speed limit will be monitored closely by Go Safe during the bedding-in period. It will allow for full systems and enforcement checks to take place and give motorists time to get used to the new speed limit. Notices of prosecution will then begin to be issued in the Summer.