You will be brought into the level on a bus. You will then get out and the 
two cars surrounding the bus have the triangle button pointing to them to 
climb in. However, they do not point to the bus you rode in. IF you get into
that bus it is practically indestructible. It also destroys other cars in 
one hit. Watch out for the helicopters dropping bombs; they are the only 
thing that can destroy the car.