I've been on more than one nature trail where there's a "bell box" at the trailhead, inviting cyclists to "borrow a bell" for their ride, and asking them to return it when they leave the trail. And they're the jingle-bell type, so they ring whenever the bike is moving. Makes sense to me. Unless its rocking a Chris King hub, a bike coasting down a dirt trail doesn't make a whole lot of noise.
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