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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.

GM shelves Camaro convertible, Z28

General Motors has delayed indefinitely the Chevrolet Camaro convertible and Z28 high-performance variant to save cash, sources say. GM also has tabled plans to add a four-cylinder engine version of the Camaro. GM is starting to ship the Camaro to dealers this week.

2013 Ford Mustang Shelby GT500 to start at $54,995

The muscle-car hammer known as the 2013 Ford Mustang Shelby GT500 will start at $54,995 for the coupe and $59,995 the convertible. Both prices include the $795 destination charge. The 200-mph pony car from the Blue Oval comes with a 650-hp, 5.8-liter supercharged V8 and a manual transmission standard.