Road closed for Guernsey Electricity cable repair work
The main route along St Peter Port's sea front is to be dug up by Guernsey Electricity as it repairs a fault.
The landward side of the Town Quay will be closed on Monday and the two lanes normally used for southbound traffic will become a contra-flow.
To allow for this, a central island will be removed, which will mean the Quay becomes one way southbound for 12 hours from 18:00 BST on Sunday.
Guernsey Electricity has estimated the cable repairs will take one week.
Northbound traffic will be diverted via La Charroterie and The Grange.