roadbed

Noun
  1. A bed supporting a road (synset 104103827)
    is a type of: bed - a foundation of earth or rock supporting a road or railroad track
    has: safety island, safety isle, safety zone, traffic island - a curbed area in a roadway from which traffic is excluded; provides safe area for pedestrians
    is a part of: road, route - an open way (generally public) for travel or transportation

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