Definitions

1. noun

A layer of material, typically gravel or crushed stone, laid down on a road to provide a solid foundation and prevent damage from weather and heavy use.

“The construction crew worked tirelessly to build a stable roadbed for the new highway.”

2. noun

The surface of a railway on which the rails are laid, typically made of gravel or other materials.

“The roadbed of the old railway was overgrown with weeds and shrubs.”