Interstate 25 runs down the Front Range of Colorado between Denver and Colorado Springs, six lanes of traffic through country that elk, mule deer, bears and pronghorn have crossed for a lot longer than there has been a road. Between Larkspur and Monument that used to mean about one lethal, traumatic or expensive crash a day. In December a bridge opened over the highway that was built for the animals, not the cars: 200 feet wide and 209 feet long, about 3,900 square metres of earth, grass and native planting carried over the traffic, with five tunnels underneath for the smaller and shyer creatures and kilometres of fencing to funnel everything toward the crossings. It is the largest wildlife overpass in North America. Ten months on, the Colorado Department of Transportation has its first full count, and wildlife collisions on that stretch are down 91 per cent, a shade better than the 90 the engineers promised. Traffic delays are down nine per cent too.

Read the full story: North America's largest wildlife overpass is working: animal collisions on I-25 down 91 per cent, Andy Corbley, Good News Network.

Cameras have been the fun part. Elk, bears and moose have all been recorded walking across, and in one clip a pronghorn, the fast, pale antelope of the plains that is famously reluctant to cross anything it cannot see over, trotted over the bridge, the first pronghorn recorded crossing that corridor in 30 years. Down in the tunnels the traffic is smaller: rabbits, and northern leopard frogs. "We are thrilled," said Bridget O'Rourke, spokesperson for Colorado Parks and Wildlife, who called the crossing's success a huge plus for the little animals as much as the big ones. Positive News, which also carried the figures this week, reports that elk, pronghorn and bears have all been photographed on the bridge. Wildlife crossings have been built in Canada, Europe and Singapore for years, and the Colorado result is the clearest yet that a bridge for animals pays for itself in the crashes that never happen. Somewhere north of Larkspur tonight, a pronghorn is crossing a six lane highway without breaking stride.

A pronghorn antelope standing in grassland
A pronghorn, the first recorded crossing the corridor in 30 years, photographed at Arapaho National Wildlife Refuge, Colorado. Photo: US Fish and Wildlife Service, public domain.

Our short take: the full story is by Andy Corbley for Good News Network (16 October 2026), with the figures from the Colorado Department of Transportation as reported by the Colorado Sun; Positive News carried the result in its week 42 roundup (16 October 2026).