The official said that people can book these cabs through the Chalo app, which is currently being used for live tracking of tickets and buses. BEST provides bus services in Mumbai and its surrounding areas, and has a fleet of approximately 3,400 buses, including more than 400 e-buses Are included. The Transport Authority has 400 Non AC Double Decker Diesel Buses in its fleet. But in 2023-14 they will be gradually phased out on completion of their codal life.