It was shortlisted for its comprehensive environmental programme, which includes the introduction of zero emission electric motorbikes to its fleet.
It also has a fleet of low-emission cars and a number of LPG vehicles.
The company is also increasing the proportion of other electric, gas, hybrid and zero emission vehicles in its fleet.
As a non-asset owing company, CitySprint has the benefit of being able to introduce new environmentally friendly vehicles, such as the electric motorbike, the moment they become available.
In addition to alternative vehicles, CitySprint has also been looking at alternative fuel options and has been selected by the Environment Agency to take part in a biodiesel trial.