Motorists face lengthy diversions as the road through St Bees is closed one way.
Northbound traffic can travel along the B5345 from the Whitehaven direction, but those travelling southbound are being diverted onto the A595.
It means vehicles which want to travel from the south end of the village to the other side, are being diverted just before the railway crossing, along the A595 and back into St Bees. There are no restrictions to those heading in the opposite direction.
The closure is due to work being carried out by Northern Gas Networks and is expected to be complete by Friday.
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