A passenger car and a motorhome meet at a narrow unmarked passage; if it is not known which of them entered first, who will have to back up?

Correct answer: The driver of the passenger car.

If it is unclear who entered first, the vehicle that ranks higher on the list of vehicle types goes first, and the other backs up. Motorhomes share a rank with passenger cars towing trailers of up to 750 kg, ahead of buses and trucks, while passenger cars rank behind all of them. That is why the passenger car backs up. The backing distance only decides priority between vehicles of the same type or vehicles not on the list, and here both are on it.

Real Decreto 1428/2003, de 21 de noviembre, por el que se aprueba el Reglamento General de Circulación · Real Decreto 1428/2003, de 21 de noviembre, por el que se aprueba el Reglamento General de Circulación