Secrets of bidders: Is this your year to steal a car at the Arizona auctions?

Each January, enthusiasts flock to Arizona for the most exciting events on the auction calendar. Seven companies--Barrett-Jackson, RM Auctions, Gooding & Co., Russo and Steele, Kruse International, ICA Auctions and Silver Auctions--will duke it out, with more than 3,000 collector cars on the block. But with real estate tanking, the economy in a tailspin, consumer confidence at an all-time low, retail car sales bottoming and automakers begging for loans in Washing-ton, is this any time to buy an old car at auction?

Chevrolet Silverado 1500/GMC Sierra [w/Gallery]

The all-new Chevrolet Sliverado and GMC Sierra 1500 pickups will be looking to steal sales from the dominant Ford F-Series in the US full-size truck market in the 2014 model year. The Silverado is the flagship of Chevrolet's three-truck portfolio, sitting above the Silverado 3500 and 2500 HD. The GMC Sierra features the same basic package as its bow-tied sibling but with unique features to offer a more premium proposition.

London black cabs to go 100% green by 2018

The Mayor of London, Boris Johnson, announced plans this week that will require all new London taxis to be zero-emission capable from 1 January 2018. The Mayor was speaking at Transport for London's 'New Taxis for London', an event where he met five manufacturers currently developing vehicles designed to meet the new requirements. Boris Johnson has previously pledged to make the capital an Ultra Low Emission Zone by 2020, although some have argued that it needs to come sooner than that.