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roadbed

roadbed

2 6.7
A layer of material under a road or train track that supports it
  • noun
  • /ˈroʊdˌbɛd/
  • Specialized
translation icon : subbase
  • Engineers inspected the roadbed to ensure it was stable enough to support heavy trains.
  • an old roadbed
  • a cinder roadbed
  • a flat roadbed

Examples

  • The construction crew is laying gravel to create a solid roadbed for the new highway.

  • Far away in the darkness, the sound of hoofbeats echoed on the rock-hard roadbed.

    Fiction book (1992)
  • To this day, a proper roadbed has never been laid.

    Academic text (1991)
  • A dark lake had formed and risen above the edge of the elevated roadbed.

    Fiction book (1991)
  • Orchards border the roadbed of the railway.

    Fiction book (1996)
  • The truck raced up the roadbed, across the asphalt, and bounded back into the dust.

    Academic text (2002)
  • The road was flanked by a city bus depot and the sloping roadbed of the Harlem River Drive.

    Fiction book (1998)
  • They're at the apron of the bridge securing lumber supports for the roadbed.

    Fiction book (2000)
  • Recycled pavement is used to make new pavement, roadbeds, shoulders, and embankments.

    Academic text (2000)
  • The shuttle rocked and bumped along the strip of road, shaken by ruts and fissures in the roadbed.

    Fiction book (1990)

Synonyms

bed
vsroadbed
  • Specialized
128 5.2

The bottom layer of earth or rock that supports a road

is the engineered layer specifically built to bear and support road and track loads
railroad bed
vsroadbed
  • Specialized
1 4.3

A layer of earth and stones under train tracks that supports them

is the foundation layer used for both road surfaces and railway tracks
subgrade
vsroadbed
  • Specialized
7.8

The ground layer prepared to support a road or pavement

is the general supporting layer but emphasizes the built foundation itself

How Stable

roadbed
  • Specialized
2 6.7
subgrade
  • Specialized
7.8

Surface Forms

roadbed singular
roadbeds plural

Morphology

roadbed = road + bed (semi-transparent) = road + bed

Components 'road' and 'bed' are recognizable, but 'bed' in the sense 'layer or foundation supporting a road' may not be obvious to all intermediate learners.

Etymology

Roadbed joins road and bed. A 'bed' here means 'a layer or base where something rests', as in riverbed or flowerbed, so roadbed is the strong base that supports a road or railway.