Queueing traffic due to rolling road block and accident, involving four vehicles on M4 Eastbound between J17 A350 / A429 / B4122 (Chippenham) and J16 A3102 / B4005 (Swindon West).
Two of the vehicles are in the carriage way and are being removed.
More top news
A woman and two young children have been seriously injured after being hit by a car near a seaside holiday park in Somerset.
Showers on Saturday and Sunday, some heavy, but sunny on the bank holiday
Some cloud tonight, showers Saturday and Sunday, sunny on Monday