Interesting post! Two other references come to mind: one is Abbas Kiarostami’s film ‘Ten’, which follows a female driver and her various passengers around Tehran. Her role changes with each passenger, from mother to sister to (her actual job) clinical psychologist; the other is an article by Sarah Sharma in Social Identities journal from 2008, entitled ‘Taxis as Media’. It’s based on fieldwork with mostly male, migrant taxi drivers in Toronto. The main claim of the article (that taxis can be thought of as a sort of medium) is not so convincing, but it’s full of interesting ideas about the mobile workplace that is semi-public, semi-private, usually servicing someone else’s highly mobile lifestyle etc.