Never get into an unmarked cab. All NYC taxicabs are clearly identified. The largest and most well-known fleet are yellow with a light on the roof that displays the cab driver’s medallion number. You can also spot the ID number on the hood. If you don’t see those three elements, move on. Outside Manhattan, look for light green Street Hail Livery taxis.
Other services like Lyft and Uber are also available, but since they aren’t regulated by the NYC Taxi and Limousine Commission, use them with caution. Know where you’re going before you get in and speak confidently to the driver. Always exit on the curbside, and keep an eye out for cyclists, pedestrians, and other vehicles. Don’t forget to tip, as stiffing a driver can get you involved in a heated altercation.