The project aims to purchase four tempos during the summer of 2005 and to drive them back to the UK, an approximate distance of 8,000 miles. Not all vehicles will be on the road at any one time; a support vehicle will carry those not on the road. The vehicles will be rotated and when breakdowns occur spares will be taken off the least roadworthy vehicle.

Throughout the journey a study of the performance of each vehicle will be carried out paying particular attention to engine performance, fuel consumption, efficiency, economy and emissions.

On reaching Worcester the tempos will be replaced by vehicles using an alternative power source and will be driven back to Kathmandu. Throughout the return journey a similar study will take place. Over 8,000 miles there should be enough data to prove that the new engines are better in every respect and will make considerable improvements to the air quality of Kathmandu, provided the technology can continue to develop.