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London's GPS-based speed-limit trial puts Big Brother's foot on the gas pedal

A fleet of 12 Toyota Priuses in London have been fitted with GPS-linked speed limiters to measure how drivers respond to having their speed controlled by a computer rather than their own feet. For now, the trial is local to London, run by Transport for London, the agency that manages the city's roads, buses, subways and trains. The agency is using its own fleet of Priuses for the test and will add a bus and a taxi later this year.

Video: Track-day fun in the Lexus LFA

As promised, the third installment in our supercar video extravaganza--after the Chevrolet Corvette Z06 and the Porsche GT2 RS--gives you the lowdown on the hyperexotic Lexus LFA and its insane 552-hp V10 powerplant. Best described by senior editor for motorsports Mac Morrison as "shrieking like a melting witch," the Lexus LFA emits a wail unlike anything this side of a Formula One racer, and its performance isn't too far off that mark, either. Check out the walk-around and some on-track fun, then come back for the VBox lap on Friday.

Audi to build cars in Mexico

Volkswagen Group has settled on Mexico as the location for a factory for Audi. The Audi supervisory board decided in favor of Mexico over a site next to VW's factory in Chattanooga, Tenn., which opened last year to build the VW Passat. The Mexico plant will provide a boost to the VW Group’s sales prospects and manufacturing operations in North America, where its light vehicle output rose 25 percent in 2011 to a record 542,363 units.