One of the mysteries of the English language finally explained.
1US. A flat road along which casks of tobacco are rolled. Now historical.
2US. A large conveyor belt functioning as a moving roadway for carrying horses, freight, etc., up an incline. Now historical.
3A dynamometer on which the horsepower of a vehicle is tested by driving rollers which provide friction similar to that of actual driving conditions.
Early 18th century; earliest use found in Laws of Maryland. Partly from rolling + road, and partly from rolling + road.
rolling road/ˈrəʊlɪŋ rəʊd/
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