If at night you are forced to leave your vehicle stopped on the shoulder of a road because of a breakdown, which lights must you use?

Correct answer: The position lights and the hazard lights.

If a breakdown leaves you stopped on the shoulder at night, you must leave your position lights and hazard lights on, if your vehicle has hazard lights. You may also use low beams, but they are not required, and position lights alone are not enough after a breakdown. In the image, the passenger car stopped on the shoulder has its turn signals and rear lights on.

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