The "fastest" BR around, notmycar is a vehicular Battle Royale game around, available on Steam.
Business Model: Free to Play
Microtransactions: Yes - Cosmetic
Vroom Vroom!: The first vehicle based Battle Royale game since the genre exploded, with highly customizable rides.
Boom Boom!: Loads of guns to choose from to bring your opponents to an untimely end.