“Wildlife crossings are growing in popularity across the country, and in recent years, Colorado has emerged as a leader. Since 2015, it has built 28 new large game crossing structures, according to the state Transportation Department…

Wildlife crossings, when combined with long stretches of fencing to funnel animals to the right location, have been found to reduce vehicle collisions with large animals by more than 80 percent.

They are expensive, but research has shown they can save money when installed on stretches of highway with at least an average of three collisions between motorists and deer per mile per year. For collisions with elk and moose, which are bigger and therefore cause more damage to vehicles and people, that threshold goes down to less than one collision per mile per year.”

From New York Times.