A For-Hire Vehicle (FHV) is a commercial vehicle affiliated with either a TLC Black Car or Car Service Livery base. Passenger pickups must always be pre-arranged, unless the vehicle is a Street Hail Livery (SHL) also known as Green/Outerborough taxi. SHL taxis must only hail passengers in designated areas. Medallion taxis / yellow taxis are another class of TLC licensed vehicle that are permitted to hail passengers from the street anywhere in the city. TNC apps such as Uber and Lyft typically fall under the TLC Black Car designation.