Definition of roadbed
1a
: the bed on which the ties, rails, and ballast of a railroad rest
b
: the ballast or the upper surface of the ballast on which the ties rest
2a
: the earth foundation of a road prepared for surfacing
b
: the part of the surface of a road traveled by vehicles
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Merriam-Webster unabridged
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Time Traveler for roadbed
The first known use of roadbed was in 1828
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