When there is fog and a passenger car is not equipped with fog lights, which lights must it turn on?

Correct answer: Low beams and position lights.

If your passenger car has no front fog lights, you must use at least your position lights and low beams in fog. Position lights alone are not enough, and high beams cannot be used without position lights either.

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