From Halopedia, the Halo wiki
Universe and lore
The cart resembles a luggage transport at an airport, having a yellow color scheme and sometimes being seen attached to trailers. It is mainly flat, with small railings on top.
There aren't vehicles directly analogous to the Cart. However, the Mongoose is similar in terms of size.
The four-wheeled cart is a slow moving, single seater. It has no horn does make a beeping sound in reverse. During multiplayer activies, players can stand on the cart without being killed at full speed.
The four-wheeled cart is drivable in Halo: Reach and can be found during the level ONI: Sword Base, early on. It can only be used in the courtyard, and cannot be taken to the next area. However, during the end of the mission, the cart can be taken into the base. Like all other civilian vehicles in Reach, the cart is weaponless and is mainly there for fun.
At full speed the Cart is capable of splattering enemies in Easy and Normal modes, however only Grunts can be killed with it. A Jackal or an Elite will merely be damaged. This is not possible on Heroic or Legendary.
The six-wheeled cart can be spawned in the Forge of the Halo 3 component of the Halo: The Master Chief Collection. Specifically on the map Waterfall, added in Season 6: Raven. It is under the "Scenery" tab.
List of appearances