Probably, people cleared the roads first (here in Canada this is at 4am typically, and again and again if it is still snowing). Then, as clearing the roads throws snow large volumes of and such everywhere, later the sidewalk clearers show up.
So now they probably just had the sidewalk clearers start work earlier, and clean an extra time, problem seemingly solved.
That seems like a very reasonable interpretation. I would add that they had. preference for making the roads safe because the roads have thousand pound death machines, and later increased the safety actions to improve the lives of people who might fall down. It was very weird to toss gender in, but this is the 2020s I guess.
So now they probably just had the sidewalk clearers start work earlier, and clean an extra time, problem seemingly solved.