A SERIOUS car accident has closed the Hume Highway southbound between Tumbarumba Road in Kyeamba and Little Billabong Road in Little Billabong.

Southbound motorists are diverting onto Tumbarumba Road and then onto Little Billabong Road to rejoin the Hume Highway.

This diversion is suitable for all vehicles.

Motorists are advised to allow additional travel time.

Emergency services and traffic crews are on site working to free a trapped occupant, and a helicopter has also landed at this location.

All northbound lanes remain open.

Emergency services remain at the scene.