The network operates in 11 cities across the UK, and has plans to roll out to a further five. Unity will handle media for the regional launches.
It will also handle media for a national campaign, which will position the car-sharing club as a compromise between owning a car and using public transport.
Unity will encourage consumers to join the 'pay as you go' car club to create a sustainable transport network.
Unity defined its target audience as the 'enlightened urbanite' as well as local councils and corporate car fleet operators.
They will particularly target The Guardian as well as trade press, general broadsheets and regionals. The work will also include an experiential element.