The termscorduroy, corduroy bridge, andcorduroy road seem often to be used interchangeably by early writers to refer to a stretch of road made passable by a surface of transversely placed logs. The relatively late quotes for corduroy roadandcorduroy bridge(def. 2) suggest that a need for a distinction between them arose only when the latter term became widely used.
2
a bridge having a surface of transversely placed logs.