Somehow, Ludacris' song "Move B***h* resonates with me when seeing that video. My question is....Did those AI cars rejoin the race? BTW Cool "bug".
Tried several times with different AI strenght and cars, never happened. Maybe other testers/players can check.
Oh dear... It'd help to know what settings you're using - get real or amateur? What AI level? But of course this kind of silliness shouldn't happen in any of the game modes