DCHP-1 Online
snow-shed 
n. a sloping shed or roof, now usually of reinforced concrete, constructed over a railway track or a highway so that avalanches may pass harmlessly overhead without blocking the way or endangering lives.
- 1872 (1873) On each side of the valley are mountains that act as natural snow-sheds.
- 1887 (1888) These snow-sheds are huge wooden constructions, with a slanting lean-to roof, designed to shoot the avalanches over the track. . . .
- 1964 The chief defences are the snow sheds (which carry slides harmlessly over the road in the Illecilliwaet Valley) and the avalanche warning system.
- 1872 (1873) On each side of the valley are mountains that act as natural snow-sheds.