The A382 is closed in both directions due to resurfacing work between the B3212 Cross Street (Moretonhampstead) and the B3387 / B3344 Station Road (Bovey Tracey).
Long delays are likely.
More top news
The leader of a drugs operation in Yeovil who used names from the TV series 'The Wire has been sentenced to more than five years in jail.
Bristol Rugby have announced the signings of young England prospects George Perkins and Ehize Ehizode for next season.
Thursday could be the warmest day of 2017 so far, with temperatures of 22C (72F) forecast, double the average for March.