Wheelman

Wheelman is a Halo 3 Multiplayer Medal awarded and achieved when the player, as the driver of a vehicle, has one of their passengers kill an opponent. The design of the medal is very similar to the Vehicular Manslaughter Medal. The Wheelman medal actually takes on the design of the Halo 2 Roadkill Medal. On the tire it says 'ROAD KILL TIRE' twice over the speakers.

It can be achieved easily with any map that has a warthog, especially during big team battle games as more maps in big team have warthogs.