The Nong Plue police station was alerted of the accident on Pattanakarn Road in Moo 6 village of Tambon Nong Plue of Chon Buri’s Bang Lamung district.
Police said Thanong Saengthong, 36, lost his left leg in the accident, which was hurled under the truck on impact. His right leg was almost severed and might require amputation later.
Rescuers rushed him to the Somdej Na Sriracha Hospital.
The car was driven by Penporn Prati, 29. She was arrested and charged with reckless driving causing injury to another.
Manote Thongkham, 42, another garbage collector, told police that he was pushing a garbage bin to the truck and Thanong was waiting at the back when the car, which was travelling at a high speed, moved out of its lane, hitting Thanong and pinning him against the truck.