If a player is close by long enough when the Police Transporter is stationary in traffic, the officers inside will get out and attack the player. If the player successfully stops the transporter, Packie and another un-named accomplice can be found in the back. If the player gets close, Patrick McReary will call out for assistance, whereupon the player can choose to attempt a rescue.
The player may encounter a Police Transporter with its siren on, driving around various locations on the map.