Make Sure Your Taxi Has A Medallion
"All licensed yellow taxis have a medallion affixed to the hood of the car and each medallion has its own individual number," Gordon said. "Medallion numbers consist of a number, followed by a letter, followed by two more numbers. For example, a medallion number could be 4Q88 (this is not an actual medallion number). Besides the hood of the car, the medallion number also appears on the rooflight, license plates, and the left and right side, just behind the rear passenger doors, on the exterior of the vehicle."
The License Plate Should Match The Medallion Number
Gothamist also points out that the taxi's license plates should match the medallion number (numbers and a letter), and if the taxi was licensed anywhere in New York State, the car should have a NY plate that reads "taxi" somewhere on it.
Don't Be Fooled By Fake Roof Lights That Say "Taxi"
Don't get into a car if the light on the roof says "taxi" or anything other than the medallion number, according to Gothamist.
If You Spot A Fake Cab, Report It To 311
As for the suspicious yellow cab that appears to be on the road again, Gordon said the TLC's enforcement unit is on the lookout for the vehicle. Additionally, he said that if anyone encounters what appears to be a phony taxi, they should report the car by calling 311.