underpass
/ˈʌndəpɑːs
/noun
A road or pedestrian tunnel passing under a road or railway.A subway is a pedestrian underpass, generally under a road....
- The park would then take a route through an underpass beneath the trunk road and continue on the side of Ramsey village.
- On the other side is a new link road taking motorists to a new underpass under the dual carriageway.