All southbound lanes have reopened on the Pacific Highway at Coolongolook following a truck crash this morning.

The truck has been cleared but one of two northbound lanes remains closed while the clean-up is carried out.

A reduced speed limit of 80 kilometres per hour is in place, so motorists are advised to slow down and exercise caution.

EARLIER:

A B-double truck crashed on the Pacfic Highway at Coolongolook in the early hours of Tuesday, June 11.

According to Live Traffic NSW, the truck crashed about 5am on the highway between Melaleuca Drive and Willina Road.

Intermittent stoppages will be in place during the vehicle salvage operation. This will not be a quick task.

A contra flow is currently in place in both directions of the highway. This is using the northbound carriageway to travel past the accident.

Traffic is still very heavy, with motorists advised to take care and allow for extra travel time.

Earlier, both southbound lanes and one northbound lane was closed.

Meanwhile, a car crashed on the Pacific Highway on the Pacific Highway near Herons Creek this morning.

A tow truck and emergency services are on site to assist the removal of the vehicle from the centre median.

Motorists are advised to reduce speed and exercise caution.