Australia has the same problem seen in most other countries. Wildlife fatalities on major highways. We see the more traditional over and underpasses but one now solution that seems pretty cool. They weave hemp into a giant macramé ladder and suspend it on poles across all the lanes of traffic and back into the forest canopy on both sides. Fencing limits crossing opportunities at ground level and they are planting Koala food favorites around the crossings to entice them to those areas. Of course, I had to google if they work. Mixed reports but some evidence from gene pool monitoring that indicates that at least some animals cross over to find their soul mates. Other arboreal critters use the ladders too. The koala just makes for a great lovable mascot to encourage support for the effort.