Motorists battling to get to work on Melbourne's congested freeways may soon have to contend with larger trucks.

VicRoads is considering dumping the peak-hour ban on heavy trucks, introduced by the former Labor government two years ago, and allowing trucks longer than 30 metres.

Former roads minister Tim Pallas launched the trial in 2009 allowing heavy freight trucks up to 30 metres long on freeways linking the Port of Melbourne with major industrial areas in the west and north of the city and in the green triangle region in southwestern Victoria.

But the heavy trucks were not allowed on the West Gate Freeway and Western Ring Road in the morning and afternoon weekday peak hours.

VicRoads is working with the freight industry to review the trial, and proposals include scrapping the peak-hour restrictions and 30-metre limit.