elevated bridge; viaduct
A bridge-like structure that carries a road or railway above ground level, often over a valley, another road, or urban area.
This viaduct was built for the Shinkansen.
There is a small park under the elevated bridge.
Compound of 高架 (elevated structure) and 橋 (bridge). The exact historical derivation is uncertain, but the term follows standard Sino-Japanese word formation.