The Audi quattro Experience reinvented the test drive. A one-of-a-kind interactive installation put drivers directly behind the wheel of a custom-fabricated, 1:32-scale, all-wheel-drive Audi slot car. Using the world’s first iPad-enabled slot car controller, visitors took their A4 for a wild test drive through hairpin turns, long highway straightaways and icy mountain passes—terrain that would get the better of lesser vehicles.