I was alerted to UITP's work on this by the cover story of New Transit magazine (7 July 2011 issue) from the UK: "Time to forget modes... the future is in the Mobility Mix". The article is well worth reading. It is subscription only but there is a free preview offer that allows a peek:
Today’s customers have a new attitude to their travel choices. Offering “combined-mobility” across the modes can persuade people away from the private car. So what are the ingredients in this new mix, and who should take the lead on serving them up?I am particularly interested in that last question!
The UITP report is by its Combined Mobility Platform. The English language version is here as a pdf. Various language versions are available.
UITP is urging its members "to build intermodal strategic alliances with Combined Mobility services such as taxis, bikes and car-sharing. This is the key to becoming real mobility providers, enabling a more complete offer for customers and delivering lifestyle services."