In modern, practical use, there’s really no fixed convention. Some places you’ll see Streets going north/south and Avenues going east/west with Roads heading out of downtown, but it’s not consistent.
Classically, a road is a road, an Avenue is a road with trees, a Street is a road with buildings, a Boulevard is a road that follows the old city walls/edge of the city, and everything else is just small neighborhood roads.
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