The script allows you to expand the range of taxis, by default consisting of only 2 cars (Cabbie and Taxi), with any number. How many and what kind of taxi cars will be in the game is up to you. Now you can work as a taxi driver on those cars whose ID * you specify in a special file. If the car model has a taxi checker on the roof, then at night it will be highlighted in yellow.
*ID - vehicle model identifier, which can be viewed in the "datavehicles.ide" file (the first number in each line is the id, followed by the model name, which often matches the name of the car in the game).