roadbed
/ˈroʊdˌbɛd/
noun
- The foundation or base layer of a road or railway track, usually made of earth, gravel, or stone, on which the surface is built.
- The railway company reinforced the roadbed to support faster trains.
- The workers laid gravel to create a solid roadbed before paving the highway.
- Heavy rains caused the roadbed to shift, creating cracks in the asphalt above.
Synonyms