The description On the GTA taxi drivers.
The Taxi Drivers
GTA III-GTA Vice City: The Taxi drivers in GTA III and Vice City are mostly Indian and usually run away if you steal their Taxi.
GTA IV: Now the Taxi drivers in GTA IV are ruthless and vengefull. This time they ain't Indian, their Greek. If you crash into them they might say the word "Malaka" which means in this case means they have no common sence and repeats the same mistakes. After that they will exit their Taxi and try to pull you out of your vehicle and start a fight. Now if they started a fight with an officer standing nearby or a Police Cruiser they will take immediate Action. And arresting the driver and taking them away.