side street
A smaller or less traveled road adjacent to away from those roads that have heavier traffic. I always use side streets to get to and from work because the main roads are a nightmare during rush hour.
side street
A minor thoroughfare that carries little traffic, as in Our favorite hotel is on a quiet little side street. The side in this idiom means "off to one side, away from the main street." [c. 1600] Also see back street.