Speed limits to slow trucks on the Monash Freeway – introduced by Roads Minister Luke Donnellan​ to increase safety – have been dumped after VicRoads said they had made traffic conditions worse and increased aggression between car and freight drivers.

The trial had encouraged tailgating and led to cars weaving, VicRoads found.

Heavy traffic on the Monash Freeway. Credit:Joe Armao

Last year, Mr Donnellan said the Andrews government would run an 18-month trial cutting truck speed limits to 90km/h on the Monash Freeway – Victoria's busiest freight route. Car speed limits remained at 100km/h.

"Reducing the speed of trucks on the Monash will only increase their travel time by one minute, but make it safer and boost the reliability of the freeway," Mr Donnellan said at the time.