Noise

Sound signifies event. A noise means something is happening... Speech, the most specifically human sound, and the most significant kind of sound, is never just scenery, it's always event.

~ Ursula K. Le Guin

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I disconcur with this sign. I don't know that a specific type of wagon makes the most noise, but I know it is not an empty wagon. Maybe really ALL kinds of wagons (except empty ones) make the most noise. Examples include: station wagons, chuck wagons, band wagons, Radio Flyer wagons, covered wagons...

Which is the noisiest? It's hard to say. Could be a Radio Flyer with a group of children screaming as they careen down a hill. Could be the wayback of a station wagon packed with children as the car careens down a hill. Could be a covered wagon full of children careening down a hill. 

Regardless, I think the noisiest wagon is one that involves both children and careening. And probably hills.