Koenigsegg is celebrating its 20th birthday this year, and for the occasion, the Swedish specialists are taking the hypercar to the next level with its new Agera One:1 at the 2014 Geneva Motor Show.

What's in a name? For Koenigsegg's latest creation, something totally awesome, that's what. The "One:1" designation refers to a one-to-one power-to-weight ratio – one horsepower per kilogram.

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Jethro Bovingdon takes to the roads around Koenigsegg’s production facility in the most powerful road car evo has ever tested – the one metric horsepower to one kilogram One:1. Christian von ...