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The great British motorway speed limit debate

Associated Press As the government plans a 60mph limit on a 32-mile section of the M1, Britain's speed limits are under the spotlight as never before. The lower limit was announced this week as part of a project to improve air quality in Derbyshire and Yorkshire. If approved, drivers will not be able to exceed 60mph between junctions 28 and 35a between 7am and 7pm.

See the Merc SLS driven by David Coulthard in 3D

Sky's 3D pub channel will this weekend host the premiere of a 3D film showing David Coulthard driving the Mercedes SLS supercar around the Isle of Man. Click here to see the making of the 3D Merc SLS video.It was shot using a second SLS carrying a brace of 3D camera gear bolted to the back. After Sky's premiere, CAR Online will show the film here this autumn.Sky's 3D channel shows in 3000 pubs (click here to find your nearest pub).    If you cannot make it to the pub, the film will be showing in Mercedes dealers and online this autumn.

After much hype (and one van), Mazda rethinks design plan

After four years of hyping its curvy, fluid Nagare styling philosophy--but developing only one production vehicle with the look--Mazda has changed design course. Now the Japanese carmaker wants to go with a simpler, more upscale style. So the design language seen in the Shinari concept car being unveiled at the Los Angeles auto show this week represents Mazda's future.