A road that is raised so as to be above water, marshland, and similar low-lying obstacles. Originally causeways were much like dykes, generally pierced to let water through, whereas many modern causeways are more like bridges or viaducts.
Any of two or more narrow paths, of steel, smooth stone, or similar, laid in a public roadway otherwise formed of an inferior pavement, such as cobblestones, to provide an easy way for wheeled vehicles.
A set of footprints left in soft ground by a human or animal, especially if fossilized.