In Alaska, as in most of the US, it is the homeowner's responsibility to clear the sidewalk/UK pavement of snow or debris. However, there can be extenuating circumstances.

In Juneau, in southeast Alaska, city road crews pile snow from the streets onto their shoulders- the sidewalks. Berms can end up as tall as four or five feet. We learn early in the wintertime to walk in the streets- it is much safer.

After streets are secured, road crews come back - frequently during the night - and grind down the berms and haul off the snow and ice to wherever they take it.

Works fairly well.