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Rear lamps on cars... for acceleration! [more ideas]

Not related to computers, but crazy nevertheless...

Similar to brake lamps on cars, these emit green light. The harder you accelerate the brighter they will shine. Lets the drivers behind you know what you are up to.

Obvious usefulness: besides showing off coolness while leaving other cars behind, it could help alleviate traffic jams by helping people "go with the flow".