green bridge

plural green bridges

1. A vegetation covered bridge over a motorway or railway that allows wildlife to safely cross over; a wildlife bridge.

   Elsewhere, green bridges and mammal tunnels are being used to provide routes across the railway for animals to cross.

   2023 August 23, Chris Howe, “Green screen: HS2's route through the shires”, in RAIL, number 990, page 35

2. Any bridge with a substantial amount of greenery, gardens, etc.
3. A bridge in an urban environment that allows only foot and cycle traffic and helps reduce motor vehicle emissions.