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a. The foundation upon which the ties, rails, and ballast of a railroad are laid.
b. A layer of ballast directly under the ties.
2. The foundation and surface of a road.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


1. (Civil Engineering) the material used to make a road
2. (Civil Engineering) a layer of ballast that supports the sleepers of a railway track
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014



a. the bed or foundation for the track of a railroad.
b. the layer of ballast immediately beneath the ties of a railroad track.
2. the material of which a road is composed.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.roadbed - a bed supporting a road
bed - a foundation of earth or rock supporting a road or railroad track; "the track bed had washed away"
road, route - an open way (generally public) for travel or transportation
safety island, safety isle, safety zone, traffic island - a curbed area in a roadway from which traffic is excluded; provides safe area for pedestrians
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.


[ˈrəʊdbed] N (US) [of road] → firme m; [of railroad] → capa f de balasto
Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005
References in classic literature ?
The bridge seemed longer than it had ever seemed before, and he was glad when he felt the beat of the wheels on the solid roadbed again.
In addition, since the new Animal Community Center was built on a former industrial site, toxic materials such as lead paint, Freon and mercury were removed and 90% of the concrete from the old building foundation was reused to build the new foundation and roadbeds.
Mike says they need a small roller to compact newly graded roadbeds and further speed the process of laying track.
For example, the film needed for roadbeds is measured in miles; and some of the anti-erosion materials are measured in acres.
The main uses are to crush development waste for underground road base or to rehabilitate existing roadbeds, to crush backfill material to allow it to pass through borehole openings of 0.4-0.5 m, and to crush ore.
Installing underground utilities below roadbeds and railroad tracks in the variable soil conditions of West Virginia has never been easy.
But in 1987, when Philadelphia tried to ship its ash to Panama to be used in roadbeds in swampy areas, a Greenpeace analysis found high levels of lead and aluminum.