Mr Clinton said speed cameras helped to save lives because speeding "significantly" increases the risk of an accident happening.

BBC: West Midlands fixed speed cameras switched off

The strategy has the potential to save billions of dollars, dramatically speed up product development and give GM an edge in emerging markets.

FORBES: Global Motors

If overall speed is the only deciding factor, save your money by picking up the original One X.

ENGADGET: IRL: Skooba Cable Stable, Kanex mySpot and the HTC One X+