Motorists are advised of changed traffic conditions tomorrow night on the Pacific Motorway at Tugun to carry out investigations.

The southbound lanes of the tunnel will be closed from 8pm on Thursday 8 until 5am on Friday 9 October. If required, investigations may also be carried out on Friday night.

Southbound motorists will be detoured via the Gold Coast Highway exit to rejoin the Pacific Motorway at the Kennedy Drive intersection.

Motorists are advised to drive to the conditions, and follow the directions of signs and traffic control.

Transport for NSW thanks motorists for their patience during this time.

For the latest traffic updates download the Live Traffic NSW App, visit livetraffic.com or call 132 701.