Here's something for Sue. Safe Turn is a wrist-mounted automatic turn signal for cyclists. You strap the Safe Turn light to your wrist. When you raise your arm to signal a turn, a tilt switch activates the three flashing LEDs. (And we all signal our turns, right?)
The Safe Turn signal light is available worldwide directly from Safe Turn in Australia. You can also buy Safe Turn from bike shops through distributors in Australia, Japan, Israel, and New Zealand. They haven't lined up U.S. or European distributors yet.
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...this seems like a sensible idea...however, the switch is designed in such a way as to be more practical for "flat" type bars... ...i'm being nitpicky but overall, it does contribute to a safer solution...