What are Motor Wars in GTA Online and how to play it?

GTA Online's weekly update came out today. This week sees quite a lot in some aspects. There are two game modes that give out bonus rewards.

Motor Wars, GTA Wiki

10 things you need to do in GTA Online

GTA Online guide with everything you need to know

GTA 5 Online Update: 3x money on Motor Wars, Thruster discount, Zion Classic free car - Daily Star

Grand Theft Auto Online

Motor Wars, GTA Wiki

How To Start Motor Wars In GTA Online

Why can't people use there brain when playing motor wars : r/gtaonline

Bonuses on Mobile Operations Missions, Bunker Research, and Motor Wars - Rockstar Games

Bonuses on Mobile Operations Missions, Bunker Research, and Motor Wars - Rockstar Games

GTA Online Update This Week - Triple Rewards in Motor Wars and More - MP1st

MOTOR WARS! (New Adversary Mode GTA 5)

Motor Wars, GTA Wiki

GTA V ONLINE - MOTOR WARS - A Lenda do Paraquedas (DLC)

Get your fix of excitement with 'Last Dose' of GTA Online's latest release - Hindustan Times