Police are appealing for witnesses following a road rage incident which left two men bruised and a car windscreen smashed during morning peak hour in Brisbane.

On Thursday, about 6am, two cars were heading into the city on the Riverside Expressway near Coronation Drive, when a man driving one of the cars got into a verbal argument with two men in the other car, police said.

The windscreen of this 1997 Holden Statesman was allegedly smashed in a road rage incident on Thursday morning. Credit:QPS Media

The man allegedly attempted to assault the passenger of the second car through the window while his was driving, and then ran into the car and pushed it across three lanes.

Police said the man then got out of his silver Suzuki Swift and allegedly jumped on the bonnet of the other car, stomping on the windscreen and then allegedly punching the passenger through the window.