UPDATE 8/9/20: Following a day of vehicle-free battle royale action, instigated after the discovery of a serious, game-breaking glitch, Infinity Ward has restored transportation to Call of Duty: Warzone. As announced in a developer tweet, vehicles have been reactivated as part of today’s playlist update. No additional insight on the incident has been shared.
ORIGINAL STORY 7/9/20: Infinity Ward has disabled all vehicles in Call of Duty: Warzone after players discovered a game-breaking glitch.
The glitch involves driving any vehicle to a specific point on the map, triggering the “return to combat area” on-screen warning you see when you go out of the play boundary.