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Don't Travel Empty
Don't Travel Empty is a coach job matching website that allows operators to share their jobs, halving the CO2 emissions of the trip and saving both companies money.
Don't Travel Empty is a subscription based service which matches journeys with other coach operators to combine the trips where able, this means less carbon emissions as one only coach does what would have been the work of two. The second coach company then pays the first for carrying their passengers for them making the enterprise profitable for both parties. 
Don't Travel Empty also says they can help find replacement coaches and drivers in the cases they are needed.