Coordination between vehicles in traffic

This study belongs to the ethnomethodological tradition of identifying the everyday practices accounting for the oiled machinery of social organization and applies this approach to understanding direction light usage. We observe a set of episodes videorecorded in North-East Italy in the urban traffic. We first unpack the meaning of direction light usage from a pragmatic perspective and then test our interpretation against the cases in our collection that seem to deviate from it. We argue that direction lights’ usage works as an announcement to some road users and a request to a subset of them; in both cases, direction lights convey contextualized (indexical) coordinates about the vehicle’s prospective trajectory. We then explain the cases in which signaling is omitted and draw some implications for traffic coordination and safety.