A similar thing is done by Chicago folks, only much more complicated. The State of Illinois has an interesting habit of bestowing honorary names on stretches of Interstate Highway; usually the names of prominant politicians. Though they name sections all over the state, it seems to be only in Chicago that the locals take it seriously. In the days before GPS, tuning in to the local traffic report to hear what traffic conditions were when you arrived in Chicagoland was well-nigh useless if you were not local. The traffic reporters all used (and they still use, IME) the honorary names only, so you would hear all about conditions on Veterans, the Edens, the Eisenhower, the Tri-State, the Dan Ryan, etc., but you'd have no clue which highways those actually were, because those names were not on standard maps.