After the World of Motion came the idea to take guests through the "proving grounds" .... and that became Test Track. Guests experienced the testing that a car goes through, culminating with high-speed trip outside of the building. Later, this became more of a branded product with Test Track 2.0. 

I'll be honest with you: I don't care much for it. Sure, its clever, but its missing some of the hallmarks of a great Disney attraction, and the aesthetics are overlooked, with the "wheel" that was the building now being overtaken by the track on the outside...