If your vehicle is stopped on the shoulder because of a breakdown, must you signal it?

Correct answer: Yes, with the hazard warning flashers and the V-16 emergency warning light device.

Yes. Even on the shoulder, you must warn others of a broken-down vehicle with the hazard lights and the V-16. The V-16 alone is not enough. At night or in poor visibility, turn on the position lights as well. In the image, the car stopped on the shoulder has the V-16 on its roof.

Reglamento General de Circulación · Reglamento General de Vehículos · RD 159/2021. Servicios de auxilio en vías públicas