The truck driven by Anusorn Wanrob, 58, crashed into a roadside wall of the motorway near a rest area in tambon Bang Wua in Chachoengsao’s Bang Pakong district.
Major Pairoj Prasit, an inspector at the Motorway Police Subdivision, was alerted to the incident at about 5.30am.
Police and rescuers found Anusorn’s body behind the wheel with no physical injuries. His body was taken to Bang Pakong Hospital for the autopsy.
Anusorn’s friend, who was driving a truck behind him when the accident occurred, told police Anusorn’s vehicle swerved before crashing into the wall.
He said Anusorn was discharged from hospital two weeks ago after being admitted for asthma.