A man has tested positive for drugs after police caught him driving with his hands off the wheel while eating a McFlurry ice cream on the Princes Freeway.

The man in his 20s was caught driving his Toyota with his knees along the Princes Freeway in Point Cook while eating the iced confection at about 4pm on Thursday.

A McDonald's McFlurry.

The man allegedly test positive for drugs and had his car immediately impounded for 30 days.

He is expected to be charged on summons with drive whilst suspended, careless driving and other traffic-related offences.

If the drug test results are confirmed, the man will also be charged with drug driving.