Found this at MiceAge.com:
A car in the Test Track queue area honors the attraction which preceded it.
The white car elevated on blocks, seen near the start of the queue for Test Track, was used in the previous pavilion to stand on this spot, the World of Motion. That attraction celebrated the evolution of mankind's ability to travel on the ground, and in particular the role played by the automobile. While the car was displayed as a normal-looking street model in World of Motion, for Test Track's queue it has been stripped down just to its skeleton.