There's a scene with trucks:

"A long line of trucks, with wooden-faced guards armed with sub-machine guns standing upright in each corner, was passing slowly down the street. In the trucks little yellow men in shabby greenish uniforms were squatting, jammed close together. Their sad, Mongolian faces gazed out over the sides of the trucks utterly incurious. Occasionally when a truck jolted there was a clank-clank of metal: all the prisoners were wearing leg-irons. Truck-load after truck-load of the sad faces passed."

The reason there are no private cars in Orwell's dystopia is the same reason there are none in North Korea, for the same mix of ideological and economic factors.