Civil-engineering technical term for the foundation layer beneath the road or rail surface. Three forms cited in
新华词典:
路堑 (lùqiàn) cut-through,
路堤 (lùdī) embankment, and the half-cut/half-fill type. Top surface =
路基面, side slopes =
边坡 — vocabulary that shows up in any Chinese highway-construction news report.
