The color yellow makes them easy to see.
yellow
One might find yellow cabs in the United States. There is a company called Yellow Cab that offers taxi service throughout many of the states in the United States.
Their are about 13,078 yellow cabs in New York City
There are currently over 13,000 medallion taxis (yellow cabs) in New York City. The exact number, according to Wikipedia, is 13,237.
So they can be easily identified as taxis. They can also be more visible from a distance, and it makes it harder for unlicensed cabs to operate. If you were to take just any car and add some magnetic signs calling it a taxi, and it is not yellow, it would be spotted immediately as an illegal cab.
4,019
meters and taxi cab drivers
London's 'black cabs' are famous for their drivers' detailed knowledge of London.
"Cabs are here!" in English is Taxi sono qui! in Italian.
they use cabs (taxi)
$476.94
There are hundreds of Taxi services across the United States. Some of the popular ones are Checker cabs, Dallas Yellow Cab, and New York Taxis. The list is endless depending on the city you are in.