Multiple R.E.V. cars can be used together and each R.E.V. vehicle can either be human controlled or autonomous.
An individual player can battle against multiple A.I. virtual drivers or multiple players can battle against each other or a common foe… or you can set up a free-for-all battle between multiple players and multiple virtual drivers.
The system expands to pretty much any number of vehicles in this way. Each player simply controls their car from their own smartphone or tablet.