Chains on the bottom of school buses and ambulances… whats that about?

Why do school buses, ambulances, and other large trucks have chains dangling from the underside of them? I’ve always wondered this

They are automatic tire chains to so the driver doesn’t have to get out of the bus to chain up. They are most commonly seen in areas which get large amounts of snow or ice.

One of the companies which manufactures and markets these chains is On Spot:

http://www.onspot.com/

3 Responses to "Chains on the bottom of school buses and ambulances… whats that about?"

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