Madrid’s New ‘Animal Highway’ Will Reconnect Wildlife Across Busy Roads

Madrid is set to take a major step forward in wildlife conservation with the construction of a massive “animal highway,”a green overpass designed to safely carry animals across one of its busiest roads. The project will be built over the M-607 highway near Colmenar Viejo and aims to prevent accidents while restoring natural animal migration routes.

Unlike a traditional bridge, this structure will be completely covered in soil and native vegetation, including holm oaks, rosemary, broom, and Mediterranean shrubs. With no asphalt or vehicles, it will resemble a natural landscape, allowing species such as wild boars, roe deer, and fallow deer to cross the highway without fear or disruption.

Measuring 137 meters long and 56 meters wide, the overpass will be supported by four concrete tunnel-like structures spanning the road below. Around two meters of soil will be laid on top, creating a living ecosystem that blends seamlessly into the surrounding environment.

To further protect wildlife, the design includes wooden fencing to guide animals toward the crossing and prevent them from approaching traffic. Large stone blocks will also be placed at entry points to stop vehicles while providing shelter for animals.

Wildlife crossings like this are already common in parts of Europe and are proven to significantly reduce animal-vehicle collisions. In Madrid, the new “green bridge” is expected to become a vital route for animals, improving safety for both wildlife and drivers while reconnecting habitats that were previously divided by the highway.

Source: Madrid Secreto, March 2026