covered in the past, this one stays up all the time, using a small damper inside to flatten out when a car drives over it at low speed. The higher force applied by a faster car would prevent the bump from lowering and, presumably, ruin that dastardly speeder's day. The things are also festooned with LEDs on the front, back, and sides, which might just mean you'd be able to see this one in time to save your dubs from destruction.
[Via Techie Diva]
LED-encrusted speed bump flattens out when you're not flat-out
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