Manx Gas is dealing with a mains leak at the Four Roads roundabout just outside Port Erin.
Castletown Road between the roundabout and Ballafesson Road in the village is currently one-way (1150 Jan 24).
Drivers have access from the roundabout into Port Erin, but a diversion through Ballafesson has been set up for traffic heading out.
Engineers are working on the problem but there's no word yet on when the leak will be capped. Manx Gas has apologised for the disruption and says it is working to resolve the issue as soon as possible.