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[rohd-bed] /ˈroʊdˌbɛd/
  1. the bed or foundation structure for the track of a railroad.
  2. the layer of ballast immediately beneath the ties of a railroad track.
the material of which a road is composed.
Origin of roadbed
1830-40. Americanism; road + bed Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for roadbed
  • The roadbed is raised above the surrounding land so that snow blows off.
  • Then the wreckers found that they couldn't burn off the nuts from the bolts on the ties without setting fire to the roadbed.
  • The street's brick roadbed now pushes up through the asphalt in big patches, and nearly every other house is empty or for sale.
  • About six inches of red clay seemed to have broken off the edge of the roadbed.
  • When the road was paved, the roadbed was built up, so the house seemed to settle down to the level of the road.
  • When used, modification or stabilization shall be required for the full roadbed width including shoulders or curbs.
  • The pulley direction is reversed to move the roadbed back into place.
  • Nine of the ten cars on the westbound equipment train derailed as roadbed conditions at the site deteriorated.
  • The asphalt is applied upon the newly prepared roadbed.
  • Also discuss in detail any planned roadbed widths that are less than standard widths.
British Dictionary definitions for roadbed


the material used to make a road
a layer of ballast that supports the sleepers of a railway track
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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