Macadam road - definition of Macadam road by The Free Dictionary
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A road surfaced according to the Macadam plan. That plan called for first spreading and rolling a three- or four-inch layer of coarse rocks of uniform size on a graded roadway and then covering it with a layer of finely crushed rock that was worked down into the interstices of the first layer.
1001 Words and Phrases You Never Knew You Didn’t Know by W.R. Runyan Copyright © 2011 by W.R. Runyan
References in periodicals archive
Even today the macadam road
stops just north of Isiolo, normally considered the frontier town between north and south.
The study concluded that a graded earth road costs approximately $26,500 per mile per year to maintain while a macadam road
(including initial construction) costs approximately $8,500 per mile per year.
The first bituminous macadam road
in America is credited to Rhode Island.