Part of Boltro Road, in Haywards Heath, has been closed until Monday due to a hole in the ground.
A large hole in the road was reported to police at 7.20pm last night (July 10).
Officers closed the road between the William Hill bookmakers and the A272 and handed over the issue to West Sussex County Council.
The council said it will be closed over the weekend and on Monday a full investigation into the issue will be needed.
It will still be open for local access.
The investigation will involve digging up the road.
At this stage the council can not say what the cause of the problem is.