Finn Helps Chinese Cross Street
(download)
Revontulet
Revolights consist of two thin LED rings that mount directly to each wheel rim. Power comes via a wire to the hub where a USB rechargable lithium-ion battery is held in a special bracket. A small magnet is secured to the fork to provide speed and orientation information to the rings. Revolights detect how fast your tires spin and only activate the appropriate LEDs so that you are always only blowing out light behind and in front of you (and not in your own eyes). When you are slowing to a stop, the light pattern changes to a safety-cycle, going around in a circle.
http://kck.st/nRFdb4
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