[martiancookbook]

My guess is that to “localize” a street is to use it as a street - primarily for interacting with the storefronts, offices or residences along it. To make it “express” is to use it as a road - primarily for transit.

Check out the Strongtowns definitions of street, roads, and stroads: https://www.strongtowns.org/journal/2018/2/15/how-to-turn-a-...