Fire and Emergency crews are working to contain a fuel spill after a crash between a truck and a tanker on Transmission Gully, but say there is still a risk of explosion.

The road is closed in both directions and Fire and Emergency Group Manager Gareth Hughes says the amount of fuel lost from the tanker is not yet known.

However, crews have managed to stop it from draining into an “environmentally sensitive” area.

A second fuel tanker is being brought to the site to decant the remaining fuel. Until that is complete, there is still a risk of an explosion so the road is remaining closed.

Fire and Emergency shift manager Murray Dunbar told the Herald commuters in and out of the city should expect significant delays as emergency crews and contractors work to clear the incident site.

The crash, which has also seen a fuel spill, was reported just before 6 am this morning.

A police spokesperson said there are no reports of injuries.

A specialist hazardous materials unit, eight fire engines and a tanker were at the scene.

NZTA Waka Kotahi said the road was closed between Pāutahanui and Paekākāriki.

Fire and Emergency says the fuel tanker is leaking.

Motorists travelling north are advised to take State Highway 58 at Pāutahanui and continue onto State Highway 59 then State Highway 1 after Paekākāriki.

Southbound traffic is advised to take State Highway 59 at Paekākāriki and follow this through to State Highway 1 at Porirua.