Wellington's motorway will be down to one lane each way at Churton Park tonight as maintenance is carried out.
The Transport Agency says the guardrail in the middle of the motorway will be replaced.
The right lane in each direction will be closed from Sunday to Thursday, from 7pm until the morning, for four weeks.
Road resurfacing will also close the northbound lanes between the Johnsonville on and off ramps from Tuesday night.
The agency said travellers will need to allow for added travel time while it completes maintenance.