noun
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.
この高架橋は新幹線のために建設された。
This viaduct was built for the Shinkansen.
高架橋の下に小さな公園がある。
There is a small park under the elevated bridge.
陸橋 is an overpass or pedestrian bridge, often smaller in scale than a 高架橋, which typically implies a longer viaduct.
Compound of 高架 (elevated structure) and 橋 (bridge). The exact historical derivation is uncertain, but the term follows standard Sino-Japanese word formation.