noun
Refers to the area immediately beside a road or path.
道脇に小さな花が咲いていた。
Small flowers were blooming by the side of the road.
道脇に車を停めないでください。
Please do not park your car on the roadside.
Compound of 道 (road) and 脇 (side). The exact historical derivation is uncertain, but the meaning is transparent from its components.