You're bringing in a whole load of baggage that isn't actually there.
Rule: no vehicles in the park.
A vehicle in the park violates the rule. If it's a vehicle, and it's in the park, it violates the rule.
Anything else you're assuming should be added to this comes from your own experiences, not from the problem statement.
The whole point is -- to you this is extremely clear, along one axis of interpretation. To other people it may be extremely clear along another; the issue is those two "obvious" interpretations don't actually align.