Bristol Dial-a-Ride is a charitable not-for-profit organisation that provides a demand-responsive transport service for mobility-impaired travellers.
At the commencement of VIVALDI, Bristol Dial-a-Ride provided a service for 27 of the 36 city wards, using 10 fully accessible vehicles. The service had some 9,500 registered members who were able to book door-to-door journeys in advance at the cost of the equivalent bus fare. They now have 10,500 registered members. As part of VIVALDI, a package of improvements to the Dial-a-Ride service was proposed, the key improvement being its extension to a new area of the city. Prior to the project, the Bristol Dial-a-Ride fleet comprised vehicles running on diesel. For the new area, a clean-fuel vehicle was planned, with liquefied petroleum gas (LPG) as the preferred option. A review of LPG vehicles registered by the Energy Savings Trust (a UK organisation established to promote the take-up of clean-fuel vehicles) identified the Mercedes Sprinter as a vehicle capable of LPG conversion, which would meet operational requirements.