I have that light, and I set up a video camera and shot video of myself riding
away from the camera and stopping. The light flashes brightly several times
when your speed drops (it's probably measuring a decrease in voltage as the
bike slows down). It seemed pretty attention-getting to me.
--Er
My toplight rear light supposedly brightens when I brake hard, but I haven't
been able to crane my neck hard enough to observe it in action. Figure it can't
hurt.
-Kai
Brooklyn NY
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Sigma makes one that lights up when you hit the rear brake. I wonder if drivers
and cyclists will understand that it is a brake light and indicates that the
cyclist is braking. I'd think it good to still call out and hand signal until
bike brake lights become ubiquitous, if they eventually do.
