The people I see walking on the street are usually choosing on-coming cars vs. falling into the road while walking on top of a hard crusted snow pile left by snow plows.  My primary point is: not everyone has access to transportation.  We need to make sure we are not creating safety hazards when we plow and we need to plow soon enough for people to use sidewalks.  The soon test might be: can wheels on a baby stroller push through the snow.  Apply common sense. People won't be going out in blizzards.