Noun
A vegetation covered bridge over a motorway that allows wildlife to safely cross over; a wildlife bridge.
Any bridge with a substantial amount of greenery, gardens, etc.
A bridge in an urban environment that allows only foot and cycle traffic and helps reduce motor vehicle emissions.
Source: en.wiktionary.orgArt market At a 2001 Christie's auction in London, Feininger's painting The Green Bridge (1909) was sold for £2.42 million. Source: Internet