1 Hist. a route used in winter, especially by dog drivers.
See also: winter trail
2a a secondary road used only when the ground is frozen, usually because the terrain is impassable at other times, formerly used by sleighs.
See also: snow-road summer road
2b Lumbering a road swamped (def. 1) through the bush and used for hauling logs during the winter months.
See also: snow-road swamp ((v.)) (def. 1)
3 Obs. a route following the course of a frozen river.
See also: ice-road (def. 2)