Here in NJ, we have Interstate roads, state roads, county roads, and local roads. Each has a different crew that does the plowing. The NJ Turnpike is usually the best cleaned in the state. They don't skimp on trucks or salt/sand/brine. That crew works for the turnpike, I assume. Have a friend that drives a heavy truck for the county; he gets called in to plow when it snows. If it's really bad snow, they'll outfit garbage truck with plows and send them out to clear snow. They plow my residential street with a pickup truck.