This article explores the sociologically neglected practice of hitch-hiking. It demonstrates the paucity of research on what is potentially a fascinating instance of social interaction and it argues that hitch-hiking provides an interesting test case for the applicability of recent social theories of risk and trust. The reasons for the relative decline in hitch-hiking in Britain are discussed and comparisons are made with continental Europe and the U.S.. The article suggests that despite the increasingly risk-averse nature of public bodies, attention to this subject could provide interesting possibilities for policy makers concerned with the development of sustainable modes of transport, as well as for those concerned with the re-vitalisation of civil society.