roadbed
Definition
Noun: 1. The foundation or supporting structure upon which a road is built: The roadbed is the prepared surface, typically consisting of compacted earth, gravel, or other materials, that forms the base layer for the pavement, rails, or other final road surface.
Usage
The word "roadbed" specifically refers to the structural foundation of a road or railway. It is the layer that provides stability and drainage. It is not used to refer to the finished driving surface (which is the pavement or roadway) or the road itself as a route.
Examples
- Noun:
- Before laying the asphalt, the construction crew spent weeks preparing and compacting the roadbed.
- The old railway line was removed, but the gravel roadbed is still visible through the grass.
- Heavy rains can wash away an improperly constructed roadbed, causing the road above to collapse.
Advanced Usage
- "to stabilize a roadbed": To reinforce the foundational layer to prevent shifting or sinking.
- Engineers used geotextile fabric to stabilize the roadbed in the swampy area.
- "roadbed condition": The state or quality of the foundational layer.
- The inspection report noted poor roadbed condition as the primary cause of the pavement cracks.
Variants and Related Words
- Roadway (n): The part of a road used by vehicles; the paved or finished surface. (This is the surface the roadbed).
- Subgrade (n): In engineering, the native soil or improved soil layer beneath the roadbed. It is the foundation the roadbed.
- Track bed (n): The foundation layer for a railway track, analogous to a roadbed for a road.
Synonyms
- Foundation (n): The base or underlying support.
- Base course (n): (In construction) A layer of material in a road structure.
- Sub-base (n): A layer of material between the subgrade and the roadbed or base course.
Antonyms
- Pavement (n): The hard, finished surface of a road.
- Surface (n): The top layer.
Noun
-
a bed supporting a road
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