Parks Canada begin this idea in the 1980's. The Trans-Canada Highway is fenced on both sides to prevent animal and vehicle collisions. They added overpasses to allow animals to move safely from one side of the Bow River valley to the other.
Highway fencing and wildlife crossing structures were largely untested ideas until Banff National Park installed fencing and 44 wildlife crossing structures: six overpassed like this one, and 38 underpasses.
A variety of wildlife now cross the highway safely. Black bears and cougars prefer underpasses; grizzly bears prefer overpasses. Parks Canada proved that roads can be made safer for people and wildlife.
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87 mm (35mm equiv.)