The closure of a section of the Bustamante Highway in Clarendon has been extended.
It was closed on Monday to facilitate drainage improvement works.
The NWA said the section will remain closed until 7 o'clock Wednesday evening to complete repairs.
A broken culvert in the eastbound lane of the Highway in the vicinity of the Foga Road exit is being replaced with a high density plastic pipe to increase the capacity of the drain.
The NWA said the work team was halfway through with repairs Tuesday afternoon when it had to retreat due to heavy afternoon showers.
The road was undermined following heavy rains two weeks ago.