This minigame was originally made by Nox 2294 on Halo Reach with the Hog Potato gametype. I remade it back in Halo 4 and Halo 2A with KoTH and now in Halo 5 with the new scripting functionality.
This minigame is pretty simple. Get inside the warthog and keep control of it to earn points. Every player inside the Warthog earn 1 point a second.
If you are in control of the warthog, there is only one thing to do: drive. Your warthog is invincible so flee as fast as you can!
If you are not in possession of the vehicle, do not worry as there are many ways to stop its driver. First off, the gametype is a fiesta gametype, therefore you have good chances of spawning with a weapon capable of neutralizing the driver. Secondly, there is a Scattershot with Void's Tear projectiles that spawns every 3 minutes in the middle of the map. If luck still isn't with you, there are some splinter grenades and speedboosts placed around the map to stop the warthog or to catch it up. Finally, the Warthog has a random potato timer. Therefore, keep in mind that it will eventually reset in the middle of the map.
Base gametype used is a Fiesta Slayer variant instead of a Minigame variant as it is the only gametype that offers both FFA and Fiesta settings, but kills don't award any point and suicides don't remove any of them.
Somehow HaloWaypoint isn't able to provide me a link for the gametype so you will have to look for the gametype called "FN Arena" on my fileshare directly from your Xbox.
Here is some video gameplay of this map: