Roads are an important issue in the Y2Y region. Not only do roads fragment habitat, but wildlife-vehicle collisions kill many animals and create dangerous situations for people. Long-term studies of wildlife crossings conducted in Banff, Alberta show that it's possible to mitigate this hazard with special over- and underpasses designed to allow wildlife to cross roads safely.

In late 2007, one such underpass was approved on Highway 206 east of Kalispell, Montana. Landowners Jay and Sandy Whitney, and Montana Department of Transportation biologist Pat Basting, worked with Y2Y, American Wildlands, Keystone Conservation, and others to raise money for the project. Highway safety funds weren't available because that stretch of highway wasn't a documented wildlife hazard, even though crews regularly hauled away roadkill. The spot where the underpass will be installed is part of an important corridor along which deer, elk, and other wildlife – including the occasional grizzly bear – can move from Glacier National Park and the Swan Range down to the Flathead River.