Rear-wheel drive cars are sporty, but novice drivers often lose control of them in slippery conditions. Front-wheel drive cars are stable and idiot-proof, but understeer like all hell. Eventually, someone got the great idea to just make an all-wheel drive car. There were a few road cars and plenty of trucks before it, but all-wheel drive's performance potential was realized with the World Rally Championship-dominating Audi Ur Quattro. The Ur Quattro's AWD is what gave it such a huge edge over its competition, especially on the dirt roads that comprised the majority of rally courses.