LONG delays are affecting motorists on the M4 this morning with all three lanes blocked westbound between Junctions 16 and 17.
Emergency services were called at 9.37am to an incident which has taken one vehicle off the road and left another on its side.
Early signs suggest injuries are minor, but the effects could yet be felt by drivers for some time yet, as the vehicles are recovered and the lanes slowly reopened.
The Highways Agency website suggests the road will be cleared by 11.30am. Motorists are advised to find an alternative route if they have not yet hit the tailbacks.