This passenger car is traveling at 90 km/h. What speed may you reach to pass it?

Correct answer: You may not pass it.

On a conventional road, a passenger car must obey the 90 km/h limit even when passing. If the vehicle ahead is already traveling at that speed, you may not pass it by exceeding the limit.

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