Wildlife Road-Crossing Structures: Green Bridge vs Underpass (2D)

Two forest patches sit on either side of a busy highway, seen here from directly above, and a live population of animals keeps trying to move between them. This simulator models the road-ecology decision every crossing animal effectively makes: detour to a purpose-built crossing structure, or risk a direct dash across traffic. Switch between no structure, an underpass, and a green bridge, tune the structure's width and vegetation cover, and dial traffic volume up or down — the structure-use probability and the Poisson gap-acceptance survival odds for at-grade dashes update live, and the roadkill and successful-crossing counters track the real consequences of each design choice, the same trade-off wildlife-crossing engineers weigh when sizing a real overpass or culvert.