Hypertext Webster Gateway: "roadbed"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Roadbed \Road"bed`\, n.
In railroads, the bed or foundation on which the
superstructure (ties, rails, etc.) rests; in common roads,
the whole material laid in place and ready for travel.
From WordNet (r) 1.7 (wn)
roadbed
n : a bed supporting a road
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