Regarding abnormally reduced speed, what is the minimum speed at which a van must travel on a conventional road (carretera convencional), unless there is a justified reason?

Correct answer: 40 km/h.

On a conventional road (carretera convencional), the general speed limit for a van is 80 km/h, so its minimum is half that, 40. The 45 minimum is for a passenger car, which may travel at 90 there.

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