This station has an elevated platform.
There is a parking lot under the elevated road.
There are plans to elevate this road.
I drove along the elevated road.
高価 (expensive) and 高架 (elevated) are pronounced identically but have completely unrelated meanings.
効果 (effect, result) shares the same reading こうか with 高架 (elevated) but refers to a completely different concept.
under an elevated structure; under a railway bridge
elevated bridge; viaduct
overhead wires; overhead power lines · elevated railway; elevated track
elevated railway station
elevated railway; elevated railroad
Compound of 高 (high) and 架 (erect, build), literally meaning 'built high'. The kanji 架 is used in words for spanning or constructing frameworks.