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2013 Maserati Quattroporte night testing (video)

Maserati has released a video of the 2013 Quattroporte out night testing ahead of a Detroit Auto Show public debut. The new Quattroporte is bigger and more powerful than the current model and leaves Maserati room to introduce a smaller version – the new Maserati Ghibli – to take on the sports saloons from BMW, Mercedes and Jaguar. To be honest, the video tells us little we don’t already know about the new Quattroporte (except perhaps that it has frameless glass in the side windows), but it does indicate how keen Maserati are to keep the new Quattroporte’s PR momentum on the move ahead of its debut.

California looks to tighten pollution limits

The California Air Resources Board is scheduled to vote on Thursday on whether to adopt stricter clean-air standards for the state proposed by the Advanced Clean Car program. The program's proposal combines the control of soot, smog-causing pollutants and greenhouse-gas emissions into a package that may be required for model years 2017 through 2025. According to the program, the rules aim to clean up conventionally powered cars, deliver more zero-emissions cars and ensure that a fueling infrastructure is available.

Spied: Cadillac ATS-V and a production 2013 Cadillac ATS on the road

Autoweek reader Christina McNeal shot these photos of a 2013 Cadillac ATS out cruising the highways of Michigan. General Motors' BMW 3-series fighter was finished in a metallic dark blue and wore manufacturer plates. According to its badging, it was powered by Cadillac's 3.6-liter six.