Where I live they plow the street with a couple graders, and follow up with a front end loader that clears the snow bank created over driveways, but only on front street driveways, and never well.
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They use a laser to melt the top layer of a bed of metal powder, lower the bed, spread more powder, repeat. It results in a generally more porus part than cast or forged material, thus weaker, but can make otherwise impossible to manufacture geometries that can be lighter weight, which can reduce the strength requirements as well. A jesus nut is not an application you skimp on strength lol