A ute was pulled over on the Western Highway in Stawell last week, clocked at 142km/h.

But what happened next came as a shock to investigating officers.

Police searched the vehicle and located approximately 6kg of what is alleged to be methylamphetamine, with an estimated street value of $6 million.

The 23-year-old driver was also found to be unlicensed.

The Coolaroo man was arrested, had his car impounded and has been charged with traffick a large commercial quantity of methamphetamine and other traffic-related offences.

He has been remanded to reappear at Horsham Magistrates' Court on 17 June.

Have you signed up to The Courier's variety of news emails? You can register below and make sure you are up to date with everything that's happening in Ballarat.