A 17-year-old boy and a teenage girl died in the head-on collision between an A-tractor and a truck on national highway 44.
Another teenage girl is being treated in hospital.
The head-on collision took place on road 44 between Lidköping and Trollhättan during the night of Thursday.
The police were alerted at 01:50.
According to the police, the truck driver was physically unharmed.
Both vehicles were impounded for technical examination and the police have started a preliminary investigation into negligence in traffic.
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Three young people were traveling in the A-tractor that collided head-on with a lorry on route 44 on Thursday night.
Photo: Torbjörn Axelsson