If you're a "biker" you probably know what hand turn signals mean and use them daily. But if the people behind you don't know them, they're essentially useless. That's where the YouTurn turn signaling glove comes in.
The YouTurn has a built in accelerometer that detects your hand signals and activates the corresponding LED arrow blinker. (If you didn't know, a left arm stuck straight out indicates a left turn. The same arm bent at a 90 degree angle signals a right turn).
It is currently in the proof-of-concept stage but your $50 Kickstarter contribution will buy you a finished production model when it is released. The finished version will be a hand attachment as opposed to the current one-piece glove+light combination. That way you can use whatever glove you like (or just roll barehanded) and be able to take it off when you're done. In the meantime, just continue being emphatic with your unlit hands knowing that help is on its way. [Kickstarter via Engadget]
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