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Alfa Romeo 4C Spider revealed: Geneva Motor Show

The Alfa Romeo 4C Spider (pictured) revealed in Geneva The Alfa Romeo 4C is the epitome of a modern ‘supercar’, with ultra light weight (for a production car) allowing the 4C to produce very good performance from its modest 17500cc engine. So producing an Spider convertible immediately raises the weight issue in a more dramatic way when the car’s abilities are so dependent on it low weight, but it seems the Alfa Romeo 4C Spider – previewed as a production car with a concept at Geneva today – has managed to keep the wight penalties of the convertible 4C down to a minimum. Thanks to a canvas roof and carbon fibre rollover bars, the weight penalty for the Spider is only about 60kg (around a 7 per cent gain) which shouldn’t hurt performance too much.

Daimler and Renault-Nissan strike a global partnership

Daimler today struck a wide-ranging partnership with the Renault-Nissan alliance, in a deal that will usher in new jointly developed cars, shared technologies and a multitude of cost savings.  Cars such as the new 2014 Smart Fortwo will now be twinned with the next Renault Twingo, while the Forfour is set for a comeback and we can expect plenty of shared combustion engines and electric motors, borrowed platforms and jointly developed SUV tech across all three parties. And that's only scratching the surface of the possibilities opened up by this wide-ranging deal.

BMW's quirky new i3

The side view of the new BMW i3 electric vehicle takes some getting used to, with no two windows the same size or shape. The i3 is high-waisted through the front door and then there's a notch for a taller rear-passenger window and the rear-hinged rear door and a narrow, tapering window at the rear quarter. Yet when you look at the underlying structure -- made of carbon-fiber-reinforced plastic -- an innovative choice for a mass-produced car -- there's a giant side opening from front to rear.