You clearly didn't understand. It's mostly not able how easy or not you found it to apply the rule, it was about how whatever you decided was actually quite different from other people. In fact, you finding it very clear makes the point apply even more.

Are you saying that an ambulance is not a vehicle?

I felt it was easy too, but I felt that almost every item listed was a vehicle and in the park. If it helps here was my reasoning. To start with I checked the dictionary for a definition and it appears that a vehicle is "A device or structure for transporting persons or things; a conveyance". Then it was a matter of categorizing. The only one I had to deliberate was the horse, because while it transports persons or things it isn't a device or structure. I ended up saying almost everything was a vehicle and in the park.