Police found tha man, 25-year-old Warodom Withayanithidilok, lying face down on the road with his HomeWorks company shirt and a brown jacket.
The driver of the truck, Adisor Samankit, 51, told police that he stopped the truck and turned on the warning lighting. Then, he heard the smash of a motorbike as it drove into the back of the large vehicle.
People at the scene attempted to help the man, calling emergency services, but he passed away on the road.