"We have confiscated the driver's driving licence and taken a blood test. We don't have an concrete suspicion that he was intoxicated, but we are working to exclude possible reasons," police spokesman Arild Ølberg told the NTB news agency.
"When a vehicle goes off the road, something's up."
The police at present do now know why the 64-year-old driver veered off the road. He has been taken to hospital and will be questioned later on. Five of the eight passengers received minor injuries.