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Cadillac ATS coupe bows at Detroit auto show

Cadillac's ATS range grows into an even stronger BMW 3-series/4-series competitor with the introduction of the coupe model, which marks the first time GM's luxury division has taken the plunge into the compact luxury coupe segment. The ATS coupe's 109.3-inch wheelbase is shared with its sedan brethren, but wears a lot of its own bodywork including a unique roof, doors, fenders, trunk lid and front fascia to not only give the coupe its own distinctive look, but to dress the wider track the coupe gets over the sedan. The ATS Coupe will be the first production Caddy to wear the division's new crest when it goes on sales this summer.

Smart Fortwo Lightshine launches

Yet another Smart Limited Edition - the Smart Fortwo Lightshine You have to hand it to Mercedes – they don’t give up on Smart (or Maybach – another expensive departure). They keep churning out new cars (well, endless new limited editions, anyway) despite sales that seem to keep falling. Last year (2010) saw Smart sales in the UK fall by 8.5% and their sales last month (December 2010) were a woeful 57% down on December 2009.

Concept Car of the Week: Ford Mustang RSX Concept (1979)

In the late ‘70s, Ford commissioned carrozzeria Ghia to build a concept car based on the Fox platform to help promote its third generation Mustang. Probably inspired by the Escort RS's success at the World Rally Championship, the concept was dubbed RSX – standing for Rally Sport Experimental – and the Fox platform-based Mustang was modified as a rally car. To improve the handling, the wheelbase from the Fox was shortened by 142mm, the track was widened by around 25mm at the rear while the ride height was increased for off-tarmac stages of European rallies.