By Jessica Anstice
The left lane is closed on the Monash Freeway city-bound between Old Princes Highway, Beaconsfield and Clyde Road, Berwick due to a van rollover.
One city-bound lane remains open, with heavy delays in both directions on the approach.
Motorists wishing to avoid delays might consider taking the Princes Highway through Berwick instead.
Melbourne-bound drivers are asked to obey the 40km/h limit when passing emergency services with lights flashing, and to merge safely.
The lane closure is under Victoria Police control. The road will re-open when the rolled van has been removed.