At any time during the game, pull out Niko's phone and dial these numbers for the desired effect.
Note that cheats will affect your missions and achievements, so either complete your achievements first or use a different profile to cheat with.
It takes place in a fictional parody of New York City called Liberty City.
Turn the camera and face the vendor and he will be there.
Type a word of phrase that relates to your question and see if it has been asked before and answered.
Rockstar put 2 different police vehicles (Police Patrol=Chevy Impala Police; Police Cruiser=Ford Crown Victoria Police).
They also include Firetruck, Airtug (Modified Baggage), Ambulance, FIB Buffalo (Similar to the FBI Cruiser only the agency has changed its name to Federal Investigation Bureau), Anihilator (police Chopper), and more. The Bus (Modified Orion V bus) and Subway (R-32 Cars) are the main public transportation vehicles in the whole entire series.