A truck has rolled on the Western Freeway this morning between Bacchus Marsh and Melton.
The Courier understands nobody is injured, although there is expected to be traffic delays for some time.
The truck was empty at the time but has spilled diesel across the road.
The crash occurred about 10am.
The Country Fire Authority is en route to wash away the diesel spill.
Motorists are advised to exercise caution around the area.