Wildlife Bridges
This is a self-initiated project in response to the real wildlife crossings that are appearing around the world. They have proven to be very successful, but are not yet in wide enough use. For perspective, damage caused by animal-vehicle collisions costs the US $8 billion every single year.
Here is an example model of how the animal crossings work - a bridge is constructed over/underground and is disguised as if it were part of the surrounding forest. Wildlife is funnelled to these crossing, preventing them from attempting to cross the road:
