The truck overturned over the wire rails on the E4, north of Söderhamn, during late Friday night.
Traffic was stopped in both directions but no driver was left at the scene when police arrived.
- Footprints were seen from the cab, says Mats Länn, the police in the Central region
Dog patrols were looking for drivers
A dog patrol was sent out to search for the man when there was concern that he had fallen down on nearby railway tracks.
- After a while, another patrol sees a man walking along the E4, he bleeds from his mouth and has broken clothes, says Länn.
The man is arrested and is now suspected of negligence in traffic, illegal driving, drug driving.
Witnesses fell into ditch
The suspect had no serious injuries but was taken to hospital for transfusion.
Another person was injured in the incident.
- We have a witness who got out of his car at the accident site, who slipped and fell into the ditch from the E4 and broke an arm or injured his shoulder.
The person is taken by ambulance to hospital, says Mats Länn.