I like that word, have not heard it before - 'ecoduct'.
Rather late in the day some authorities are realising that you need corridors of green space within towns and that these are useless unless you can allow animals across roads.
In Mile End, in eastern London, a very nice green corridor has been created along the canal. It has many components including an 'ecology area'
Discover Tower Hamlets - Parks - Mile End park although, ironically, it was first conceived in 1940! Better late than never ...
Crucially, they recognised that it is bisected by some seriously busy roads and therefore created green bridges:
