MLX

The MLX is a civilian vehicle, seen in the Halo 2 levels Outskirts and Metropolis. It looks like a normal car, but with the 2 rear tires being supsended on "legs" independant of the car, meaning the engine is likely housed in the front. It is not pilotable, but can be destroyed with sufficiant weapons fire, making it a possible hazard for units within the blast radius. It appears to be a a fast car, and only has 2 doors, the common symbol for Sport cars (Smaller, faster, lighter).

http://nikon.bungie.org/misc/sloftus_scalecomparison/?display=UNSCVehicles