Police have impounded a man's car after he was caught travelling at almost 200km/h on the Hume Highway north of Melbourne on Sunday morning.

The 20-year-old Reservoir man's white Holden Commodore was clocked at 193km/h in a 110km/h zone at Mangalore just before 9am.

Police pulled over the man and impounded his car for 30 days.

He is expected to be charged on summons with speeding and other traffic offences.