A concept: The Phree Philly Phloop is a concept rapid bus route circulator that could connect center city with nearby neighborhood, particularly those undergoing rapid development. It would be free and frequent, making it easier to live car-free in the greater center city area. It would connect to the BSL at key intersections and could also connect to parking structures (as yet up built) to make it practical to leave a car and hop on.
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The basic idea...
As incorporated into the existing map.