We have recently witnessed the emergence of a range of naturalistic studies concerned with work, interaction and technology in complex organisational environments. In this paper we examine a seemingly individual and isolated activity, which involves the use of relatively basic technology to guide a vehicle in accord with a highly regulated signalling system. The paper considers the ways in which operating a vehicle is systematically co-ordinated with the actions of others. These actions, whether by passengers or colleagues, are only `visible' by virtue of various technologies; technologies that offer restricted and even distorted access to people and their conduct. In one sense, therefore, the essay is concerned with explicating the socially organised and interactionally sensitive `intelligence' which features in the day-to-day work of drivers on London Underground; a rapid urban transport system which carries more than a million passengers a day.
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