M4 traffic: Multi-vehicle crash between Cardiff and Miskin causes heavy congestion

Traffic cameras show long tailbacks on the M4 westbound following a multi-vehicle collision. Credit: Traffic Wales

There is heavy congestion on the M4 westbound in south Wales following a multi-vehicle crash.

Traffic Wales said emergency services had been called to the scene of the collision between J33 Capel Llanilltern and J34 Miskin on Friday afternoon.

Traffic monitoring service Inrix said the collision happened on the hard shoulder.

One lane is blocked and motorists are being urged to allow extra time for travel.