Eastbound lanes of a major road in Sydney’s lower north shore have been closed this morning due to a HAZMAT incident, causing traffic upset.

Crews are hosing down a building in Cremorne due to a potential asbestos threat, which has caused the closure of one of two eastbound lanes of Military Road.

Traffic is heavy in the area and motorists are urged to expect delays, Live Traffic NSW advised.

Drivers are being redirected onto Winnie Street. (9NEWS)

The site in Cremorne is currently under development. (9NEWS)

Drivers are being redirected onto Winnie Street by police.

It’s believed several workers were found trying to remove asbestos from the building around 3.30am.

Around 14 firefighters and HAZMAT officers have been working on the site this morning to remove the asbestos and secure the area.

The building is currently under development.