To speed up travel times, buses are equipped with special transmitter devices that send a signal to traffic lights, which cause them to favor the bus by holding green lights longer and shortening red lights. Metro Rapid buses also stop less frequently than Metro Local buses, with Rapid stops located only at major intersections and transfer points. The frequency of Metro Rapid buses is increased as well, as more buses on a line translates to less wait time at each station. All Metro Rapid buses are low-floor CNG buses for faster boarding and alighting.