I was on the original R&D team for Indy at WDI. The cool thing is we originally mocked up the ride system as an AGV-based prototype. Funny story about one of the first proof of concepts. Lucas, Eisner and Wells were there and looking forward to riding it. We had it set up at the Te Hunga building all programmed and ready for a spin. They boarded the car and we started it up. It was going along well in its figure 8 pattern for a while until the vehicle's guidance receiver went out. The E stop bus is supposed to activate in that situation but it didn't. The vehicle left its safe path and started heading toward a wall at full speed. We were frantically trying to figure out how to stop it before we killed all three of them. Thankfully two of our guys were close enough to the path that they were able to run with the car and reach over to the E Stop button.
To make a long story a bit shorter, the car stopped ubruptly and their reaction was like 3 teenagers that just got off an exhilerating thrill ride. They loved it and bought off on it for further development. They had no idea that they were about to be seriously injured. That was the day we decided not to go with the wireless system for that attraction.