we are talking about Major roads and motorways in around large towns and cities..i have never heard of any size able population centre say above 25,000 being cut off for any length of time..sure small rural communities it may happen..but that happens here too...also you dont have prolonged periods of severe cold..once the snow slightly thaws and refreezes it becomes solid and the wind wont blow it around..it only takes one day for the temp to creep above freezing for a few hours for this to happen..i mean i live out on the prairies where a tree is novelty and there are no such things as hedgerows..you would think snow would be blowing around constantly all day every day when its not snowing..during the winter..but just one day when it jumps above freezing the snow stabilizes and it doesn't go anywhere...also things grind to a halt here too..but only the day its snowing next day everything is back to normal.