What do the red lines on the sides of some Spanish roads mean?

The red side lines painted on certain roads by the DGT indicate high-risk zones .

These areas have a higher number of accidents, especially involving vulnerable road users like cyclists or pedestrians .

The goal is to increase driver awareness and encourage slower, more cautious driving in those zones.

So if you see red lines on the edge of the road, stay alert and reduce your speed — you’re in a danger zone.