The restriction is in place between Junctions 1 and 2 due to strong winds on the bridge. Traffic is moving well, however.
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Mrs Justice Nicola Davies will sentence Berlinah Wallace, 48, at Bristol Crown Court.
After cool early morning weather bringing mist and fog, there should be a bright afternoon for most parts of the region.
Any early mist and fog will soon clear, with unbroken sunshine through the day for most.