If I had the $$$ to render a quick clip I would, but a description will do well enough for the mean time. As you know, at the end of Coastal Highway, you have to ditch your ride and hold off a bunch of Covenant waves until you are extracted. For those looking for an added punch or something a little different to try, you can get the Warthog over the vehicle barriers in the offramp. Normally the game would keep you from driving all the way over it with an invisible barrier of sorts, but it's easy to break through. Note that this may be easier on co-op for several reasons. 1) First, you will need another large vehicle, preferably a Scorpion. Use this vehicle to push one of the many abandoned civilian cars against the barrier so it forms a makeshift ramp. This serves mainly to allow the Scorpion to do its trick. 2) Drive the Warthog up this ramp and as far out as you can. It should be prevented from driving in to the plaza by the invisible 'wall'. 3) Drive the Scorpion up the same 'ramp' and try to push the Warthog. It should be easily nudged beyond this barrier, allowing you to use a Warthog in the final fight. I haven't tried to bring the tank itself in to the plaza, but I'm sure it could be done somehow. Having an extra hand to help you get the Warthog over the barrier and to man said Warthog is advised. You are then free to drive it around, up the steps and to the 2nd level of the plaza. Having a Gauss Turret handy will make short work of just about everything you fight.