Arias Pistons 12.5:1 Compression 82mm Bore Honda B-series on 2040-parts.com

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.

What the Future Holds, Nobody Knows

It's a testament to the talent, charisma and relative celebrity of Ian Callum, Derek Jenkins and Franz von Holzhausen - heads of Jaguar, Mazda and Tesla design, respectively - that they managed to captivate a crowd of industry insiders at the tail end of the Los Angeles Auto Show's second press-preview day. This despite being given a nebulous topic to discuss with a moderator who knew little about the subject. Dan Lyons, a technology columnist at Newsweek, oversaw the panel discussion that was to focus on "Tomorrow's Cars...Practical Transportation or Groundbreaking Design?" He asked only one question on that topic before digressing into a more general discourse on the design strategies of Jaguar, Mazda and Tesla.

Jaguar XKR-S Convertible (2011) first pictures

Jaguar has announced the smallest surprise of the year - a convertible version of the rabid XKR-S. We all knew it was coming, but it shouldn't take the sheen off the fastest and most powerful Jaguar open-top road car ever. It's essentially the cabrio bodyshell mated to the XKR-S mechanical spec.