That's a great point. I'm starting out with experiences that are intended for low speeds. In the video, the vehicle is never going more than 5 mph. I think there's a lot of ways to make things interesting, e.g. adding additional tasks, without having to go much faster.

In regards to multiple vehicles, you're absolutely right. At the current state, this is limited to one player per driving area. But the fact that the vehicle is software controlled, will allow multiple vehicles to eventually drive on the same track.