Brilliant! Apparently these things have been around since the 70s, but I've only now heard of On-Spot tire chains. These gadgets have short lengths of steel chain attached to a spindle. When the driver encounters heavy snow, s/he can lower them to tire level. The spindles spin with the wheels, driving the chains beneath the tires. When the driver turns them off, spring tension raises the spindles back up.
-via TYWKIWDBI
That's so much easier than putting on chains! Genius!
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I would but crush-proof bells at the ends of each chain.
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