Plenty of science involved in reading the signs in Canada's avalanche alley

I've driven this stretch many times, both summer and winter. It is gorgeous, but in the winter it can be scary. The snow-sheds are cool until you think of what could happen if an avalanche came down and you become very glad that people are monitoring the hazard.

A 40-kilometre stretch along the Trans-Canada Highway in the Rogers Pass has the dubious distinction of having the highest avalanche hazard index of any route in Canada.
Jeff Goodrich, the senior avalanche officer for Parks Canada, says there are 134 avalanche paths that can hit the road at any time. He said the eastern part of Glacier National Park, which is populated with heavily reinforced snow sheds to protect motorists, is easily the worst.