Yva Momatiuk & John Eastcott / Permafrost cooling device along Alaska Highway helps to stabilize slopes of roadway and prevents frost heaves, Yukon, Canada

Michael Quinton / Grizzly Bear (Ursus arctos horribilis) pair mating in roadway, Alaska

Norbert Wu / American Bison (Bison bison) uses roadway groomed for snowmobiles, Yellowstone National Park, Wyoming