One lane closed and queueing traffic due to debris on road and accident, a lorry involved on M4 Westbound between J16 A3102 / B4005 (Swindon West) and J17 A350 / A429 / B4122 (Chippenham).
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The RMT Union's comments come as it's announced a new operator will takeover the South West Trains franchise.
Monday's forecast for the west of the region
Monday's forecast for the east of the region