 Thousands of taxis have now been installed with Cabvision in central London.The creators of Cabvision are media and advertising executives Jonathan Marquis, a former senior advertising director of the Dentsu Group and Peter Da Costa, proprietor of KPM Taxis.Supported by a number of media and technology companies including IBM, Trident Microsystems and Liquid Digital, The passenger is given several choices at the beginning of each journey and may select from a variety of channels or mute.