Originally, boulevards had a divider (planted with trees and shrubs, usually) between opposite-bound lanes. However, nowadays that is no longer necessarily the case, and all of those street names that you list are arbitrary and at the mercy of the city planner's office.
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AnonymousTechnically speaking, a street should be the smallest of the four, with avenue the next largest, drive the next biggest, and boulevard the biggest,I'm curious as to your source for this statement.