Motorists are advised of changed overnight traffic conditions next week on the Pacific Motorway at Tweed Heads to carry out essential maintenance work at the Tugun Bypass Tunnel.

To reduce impacts to motorists, the northbound and southbound lanes of the tunnel will be closed overnight on Tuesday 17, Wednesday 18 and Thursday 19 August from 7pm to 5am, weather permitting.

During the Tuesday night closure, northbound traffic will be diverted at the Kennedy Drive off-ramp, with southbound traffic re-entering the highway at the Kennedy Drive on-ramp.

During the Wednesday and Thursday night closures, traffic will be diverted at the Gold Coast Highway interchange.

Both northbound and southbound traffic will be diverted onto the Gold Coast Highway and Stewart Road during the closure.

Motorists are advised to allow up to 10 minutes additional travel time, drive to the conditions and follow the directions of signs and traffic control.

The tunnel will remain fully operational during the day.

Routine maintenance of the tunnel is carried out every three months and involves a range of measures such as inspecting the various operating and safety systems.

Transport for NSW thanks motorists for their patience while this essential maintenance work is carried out.

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