Take the truck and drive out Gate 1, then follow the road until you reach an intersection. Turn left to see the on and off ramp for the major highway. Take it, then drive the truck along the highway at maximum speed and ram gang-controlled cars. Try avoiding innocent and police cars or you may be attacked. If done enough times, you will run out of cars on the highway. Just die and more cars will reappear, or quit and come back. You will soon have star level driving this way.