The state highways leading into the capital are going to be chock-full of cars on Thursday, so being patient and sensible is key, police are urging.
A 24-hour strike of rail workers means no commuter trains are running, while no replacement buses will fill the gaps.
This means people that make up the more than 30,000 daily passenger journeys will likely take to cars.
Wellington road policing manager Inspector Jan Craig hopes drivers will be sensible.
"We need motorists to take it easy," she said.
"Accept your journey is going to take longer than normal and sit back and enjoy the ride.
"If you can, think about getting on the road early or later in the day."
Insp Craig said to watch following distances and be on the lookout for more pedestrians, cyclists and motorbikes out there than usual.
Wellington's regional and city councils are asking commuters to carpool or not drive into the city if they have no pre-planned parking space.
Train services will return to normal for Friday.