If you park your car in front of a fire hydrant, do the firefighters really have to smash your windows instead of simply laying the hose over or next to your car? It might look like they're just annoyed, but they have no choice. First of all, the hose is 10 centimeters thick and won't fit under a car without getting pinched. But the main reason is physics. When this hose fills with water, it becomes rock-hard, almost like a steel pipe. And if you were to lay it over the roof of a car, the roof would immediately collapse.
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