A cycling jacket that tells drivers when you're braking, accelerating or turning?
Sign me up!
And to people who honk at me when I turn left (from one designated bike route onto another) on that steep downhill stretch: the reason I didn't signal is that I need BOTH my hands to work the brakes, otherwise I won't be able to make the turn. Moving into the centre of the road and repeatedly shoulder checking should be good enough signs that I'm about to turn.
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