roadbed

road·bed

1. the foundation laid to support the ties, rails, and ballast of a railroad
2. a layer of crushed rock, cinders, etc. immediately under the ties
the foundation or surface of a road or highway

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"Roadbed." YourDictionary. LoveToKnow. www.yourdictionary.com/Roadbed.

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Roadbed. (n.d.). In YourDictionary. Retrieved from https://www.yourdictionary.com/Roadbed

roadbed

noun

a. The foundation upon which the ties, rails, and ballast of a railroad are laid.
b. A layer of ballast directly under the ties.
The foundation and surface of a road.

THE AMERICAN HERITAGE® DICTIONARY OF THE ENGLISH LANGUAGE, FIFTH EDITION by the Editors of the American Heritage Dictionaries. Copyright © 2016, 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.