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If it's metal bent to look like a tank then it's not a vehicle.

If it's a real tank that just happens not to work any more then it's a vehicle even if it as a monument as well.

I didn't get to the tank in question but also: Let's assume the city or whoever wrote the rule because it's their park, so they are usually allowed to break their own rules anyway. (Maybe I am missing the point of this example, but even in our parks with something of that rule the utilities have golf carts to grab the trash and no one objects to that rule...)

The instructions specifically tell you to ignore any of these "the rule exists but we are allowed to break it" situations. It's what trips people up with the questions about police cars and ambulances too - they also violate the rule. Whether they are allowed to or not is not the question.

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