Part 6/9:
When deciding whether to build an overpass or an underpass, engineers must consider multiple factors. For many species, existing infrastructure such as bridges can be adapted with additional fencing to channel animals into safe passages. However, for larger animals that may distrust narrow dark spaces, well-designed overpasses become essential. Plays of light, vegetation cover, and removal of human disturbances contribute to the crossing’s effectiveness, as animals are naturally more inclined to utilize paths that mimic their native habitats.