The dreadful toll of wildlife-vehicle collisions — and what we can do about it

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Advances in research technology over the past decade have revolutionized experts’ understanding of how wildlife move across landscapes and are now helping to resolve wildlife-vehicle conflicts that are rising due to increased development. One example is GPS collars that are affixed to big game, as well as other mammals and birds, and transmit electronic signals via satellite from some of the most remote regions in the U.S. to researchers throughout the country. This data captures exactly where and when animals move within large landscapes, enabling scientists and engineers to pinpoint where the construction of wildlife crossings — mostly overpasses and underpasses that help animals traverse highways — can most effectively improve motorist safety and facilitate animal migrations. Studies show that a well-placed underpass or overpass can reduce wildlife-vehicle accidents by over 90 percent, providing a high rate of return on federal and state investments in such structures.