The accident took place on the flyover going across the Pathum Thani-Bang Pahan road in Chian Rak Yai subdistrict.
The driver, Saran (surname withheld), 58, said the rope holding the 4,032 boxes together had split, sending the shipment flying off the truck’s rear on to the road.
It took police officers and volunteers several hours to clear the road and get the traffic moving again.