Based on interviews with joyriders in West Belfast, the first study describes the social context of the phenomenon and profiles a typical joyrider, who has a strong sense of identity, is isolated from the community, has often dropped out of school, and uses joyriding as a means of attaining excitement and escape. A computerized study of car theft in South Belfast identified the total number of cars stolen during a specific study period, characteristics of the stolen vehicles, time of theft, and detection and recovery rates. A survey of car theft in Northern Ireland between 1980 and 1988 was conducted using available statistics. Recommendations for preventing car theft include preventive measures -- enhanced security systems, improved parking facilities, and publicity and educational campaigns -- as well as interventions aimed at meeting young people's need for exciting experiences and providing opportunities for success and status. 11 tables, 8 figures, 8 notes, and 11 references