Book excerpt: Traffic psychology is a rapidly expanding and broad field within applied psychology with a considerable volume of research activities and a growing network of academic strands of enquiry. The discipline primarily focuses on the behaviour of road users and the psychological processes underlying these behaviours, looking at issues such as cognition, distraction, fatigue, personality and social aspects, often delivering practical applications and educational interventions. Traffic psychology has been the focus of research for almost as long as the motor car has been in existence and was first recognised as a discipline in 1990 when the International Association of Applied Psychology formed Division 13: Traffic and Transportation Psychology. The benefits of understanding traffic psychology are being increasingly recognised by a whole host of organisations keen to improve road safety or minimise health and safety risks when travelling in vehicles. The objective of this volume is to describe and discuss recent advances in the study of traffic psychology, with a major focus on how the field contributes to the understanding of at-risk road-user behaviour. The intended readerships include road-safety researchers from a variety of different academic backgrounds, senior practitioners in the field including regulatory authorities, the private and public sector personnel, and vehicle manufacturers concerned with improving road safety.