CPAWS has just made a video on wildlife and the trans-Canada Highway that runs through part of Banff National Park. Significant expenditures have been made to build fencing and wildlife overpasses and underpasses.
These measures work, but they have to be designed correctly, put in the right place, and one kind of crossing does not fit all species.
In sum, I think they concluded that these measures have dramatically reduced wildlife mortality on the highway, but they have not increased, and perhaps have even decreased, the amount to wildlife that gets over the highway.
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