Here's a funny story about my experience on Test Track.
I was at Epcot this past August, and this was about my 3rd time riding it that day. I was with my friend Lisa, and we were sitting in the front with this girl we didn't know and this family of 3 in the back seat. Well, we started in the ride and it was all going well - and then we got to the "brake" section of the ride. Now, Lisa and I had ridin this before, and were afriad when we saw a car parked in the middle of the speed-up section. I looked to Lisa and said "there wasn't a car parked there before" and she agreed. We knew that in a few seconds, we should be speeding right toward it. So we figured, maybe that car in front of us has a problem - so we'll stalll here.
Well, the light turned to yellow and then to green, and the voice in the car said "okay, go!" and our car started speeding up. I was like "oh crap!" as we sped toward the seemingly broken-down car in front of us. Right before we hit it, our car stopped suddenly, throwing us all a little bit forward. Good thing for good seatbelts, but it was still a bit frightening. Suddenly, the car in front of us began moving again - and then we were on our way. The car behind us didn't speed toward us, and I can't imagine what happened. Maybe it's a new form of brake-testing. I'm just glad the actual emergency brakes worked.