A hackney or hackney carriage is a carriage or car for hire. A hackney of a more expensive or high class was called a remise. A symbol of London and Britain, the black taxi is a common sight on the streets of London. The hackney carriages carry a roof sign TAXI that can be illuminated to indicate their availability for passengers.

The New York City Taxi and Limousine Commission is an agency of the New York City government that licenses and regulates the medallion taxis and for-hire vehicle industries, including app-based companies such as Uber and Lyft. The TLC's regulatory landscape includes medallion (yellow) taxicabs, green or Boro taxicabs, black cars, community-based livery cars, commuter vans, paratransit vehicles (ambulettes), and some luxury limousines.