A truck crash has blocked the northbound lane of the Midland Highway north of Kempton.
One person is in critical condition, A rescue helicopter has been dispatched to the scene.
Emergency services are responding to the crash, around seven kilometres north of the town.
The crash is believed to have involved a single truck and no other vehicles.
One person is reportedly receiving medical assistance at the scene, police said.

“Motorists are asked to avoid the area until the scene is cleared,” police said.
