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Traffic Booster honks at drivers as soon as the light turns green

The Traffic Booster is a simple little device: a few resistors, some switches, a box with a cheap car horn in it. The schematics are here for easy home replication, dog-eared copy of "The Anarchist Cookbook" not required. But the apocalyptic infuriation it causes is priceless, and if deployed across a city center, the ensuing riots will cause untold millions in damages.

Geneva motor show 2014: CAR’s A-Z guide

By the CAR online team Motor Shows 12 February 2014 16:00 The 84th Geneva motor show kicks off on 6 March 2014, showcasing the latest in new production cars and outlandish concept designs. Headline debutants at this year’s event include the new twin-turbocharged Ferrari California T, Audi’s first series production hot supermini, the new Mercedes S-class Coupe, and a hardcore McLaren 12C 650S model to take on the Ferrari 458 Speciale. Click the links below to jump straight to CAR’s latest articles on the new cars of the 2014 Geneva motor show.

Hamann Motorsport tie-dyes McLaren MP4-12C

Tuner Hamann Motorsport is going after BMW's art car with its new creation. The colorful memoR package for the McLaren MP4-12C turns the angry supercar into a Technicolor rolling sculpture for Timothy Leary fans. Of course, this car is from Hamann, so it's equipped with a carbon-fiber body kit.