The purpose of the project is to demonstrate the reliable and efficient operation of a small hybrid electric bus operating in a city centre. The emission target is to achieve effective zero emissions (less than 10% of Californian "Ultra Low Emissions Vehicle" standard - ULEV) within the city centre and at the extremes of the route. This approximates the emissions currently produced by the average UK power production and so represents the same global emission value as a 100% electric vehicle as well as achieving ultra-low emissions at point of use.