Wildlife Road Mortality: Scale, Impact, and Mitigation Measures

Road vehicle collisions kill billions of wild animals annually worldwide. Mitigation measures including wildlife crossings significantly reduce mortality and suffering.

Key Facts

Roads kill an estimated 1-2 billion vertebrates annually in the USA alone
Badgers, hedgehogs, deer, and amphibians are among the most affected UK species
Wildlife crossing structures including tunnels and green bridges can reduce mortality by 80-90%
Warning signs and speed restrictions in known wildlife crossing areas provide moderate protection
GPS tracking of individual animals allows precise identification of road mortality hotspots

Welfare Considerations

Road mortality causes massive individual animal suffering and population-level conservation impacts. Animals struck by vehicles may die instantly, slowly from injuries, or survive with severe disabilities. The scale - billions of animals annually - makes road mortality one of the largest sources of anthropogenic animal suffering globally. Mitigation measures including underpasses, fencing to guide animals toward safe crossing points, and wildlife bridges significantly reduce casualties when properly designed and maintained. Amphibian tunnels under busy roads during migration periods have been particularly successful. Identifying and prioritising road mortality hotspots using GPS tracking data enables cost-effective intervention targeting.

What You Can Do

Support wildlife road crossing infrastructure projects in your area
Reduce speed in areas with wildlife crossing warning signs
Participate in citizen science road casualty recording projects
Advocate for wildlife crossing requirements in new road construction planning