The A37 in Dorset between A35 / B3150 (Dorchester) and A30 (Yeovil) has been cleared and traffic is moving again.
The road between Dorchester and Yeovil was blocked earlier in several places by stuck vehicles and snowdrifts, but is now fully passable.
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The RMT union has accused Southern of inventing figures which the company claims show record numbers of guards are going sick.
Thursday morning's weather for the west of the region
Thursday morning's weather for the east of the region