What does the sign indicate?

Correct answer: An exit 100 meters ahead.

The blue panel with a single diagonal stripe and “100 m” warns you that the next exit from the freeway (autopista) or high-capacity divided highway (autovía) is about 100 m ahead. Panels announcing a railroad crossing have red stripes on a white background, and an emergency braking area has its own sign.

Real Decreto 465/2025, de 10 de junio, por el que se modifica el Reglamento General de Circulación