On a conventional road outside a built-up area, what is the maximum speed a passenger car is allowed to reach in order to pass another vehicle?

Correct answer: 90 km/h.

Outside a built-up area, a passenger car has a 90 km/h limit on a conventional road (carretera convencional) and must obey it when passing too. The 110 comes from the former 20 km/h allowance, which has been abolished, and 120 is the limit on freeways (autopista) and high-capacity divided highways (autovía).

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