The B3232 is partially blocked due to fallen power cables and an overturned car around the turn for Huntshaw.
Police advice is to use the A roads between Torrington and Barnstaple instead.
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Jeremy Corbyn's visit has been one of the big talking points of another busy day at Glastonbury.
The Labour leader said socialist politics would not be put "back in a box" as he appeared on stage at the festival.
Turning windier with a few showers