Considering A Car-Free L.A.

"Gensler Los Angeles recently designed a phone-based application, Network_LA Transit, which generates flexible vehicle choices, by managing individual commuting needs through a system of data. The network adapts and restructures existing transportation systems such as bicycles, scooters and the LA Metro, while personalizing them to individual commuter needs. It works by keeping current transportation stops, but also liberating the routes to respond to user demands. Network_LA Transit integrates real-time data from ground transport, stops and users through a GPS application, tripFinder, to generate optimal itineraries for each user."

A video explains the idea, though as this post suggests, such a project would likely require many users to have a noticeable effect.