Taxicabs are operated by private companies and licensed by the New York City Taxi and Limousine Commission. "Medallion taxis", the familiar yellow cabs, are historically the only vehicles in the city permitted to pick up passengers in response to a street hail. In 2013, a new type of street hailed livery vehicles called "boro taxis" in "apple green" color are permitted to pick up passengers in the outer boroughs and the northern part of Manhattan. A cab's availability is indicated by the light on the top of the car. When the light is lit, the cab is empty and available; when it is not lit, the cab is unavailable.