How do wildlife know to use animal bridges and crossings

Do animals really use those bridges to cross roads and highways? And how do they work to keep people and wildlife safe?

Reports Offer Guidance on Why and How to Build Wildlife Crossings - Center for Large Landscape Conservation

Once controversial highway program is now massive success story - Columbia Insight

Animal Crossings Are Helping Reduce Road Kill, CDOT Says

How Do Animals Safely Cross a Highway? Take a Look. - The New York Times

How Do Animals Safely Cross a Highway? Take a Look. - The New York Times

Animals Are Using Utah's Largest Wildlife Overpass Earlier Than Expected, Smart News

Wildlife crossing - Wikipedia

Why Aren't More Wildlife Crossings Being Built? - Uncommon Path – An REI Co-op Publication

Some Countries Build Wildlife Crossings Over Highways, and They're So Effective We Need Them Everywhere / Bright Side