City maintenance department or public works.
It wasn't me. Honest!
No, you're not since the sidewalk is technically not your property. The city where you live is the one responsible for clearing and/or placing salt on the sidewalk to prevent ice.
In most US cities, the sidewalk is on an easement owned by the city. This easement usually runs from the sidewalk to the curb. The property owner is responsible for the upkeep of the sidewalk including shoveling snow and repairing any damage.
Holiday Style.
In this city, it is legal to ride a bike on the sidewalk unless there are specific local ordinances prohibiting it.
This probably varies from city to city, and building code to building code. When I was growing up in the city of Detroit, sidewalk squares were 5' x 5'.
new york city
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The Boardwalk.
Usually 'the gutter'.
the Boardwalk
Arborist.