We normally link bridges with cars, bicycles, people, but throughout the world there are other kinds of bridges, with environmental concern.
Banff National Park, Canada, the highway that crosses it is covered by a bridge allowing wildlife to go from one side to the other.
Similar situation in the Netherlands A50
Or in Birkenau, Germany
As the Scotch Plains, New Jersey, USA
Indian Reservation of Flathead, Montana, USA
Interstate 78, Watchtung reservation, New Jersey, USA
Keechelus lake, Washington state, USA