A two-year study, ‘Speed cameras in an urban setting: a cost-benefit analysis’, which has been published online in ‘Injury Prevention’ claims that the deployment of speed cameras in urban areas saves vast amounts of money as well as lives. The authors (Joan Mendivil, Anna García-Altés, Katherine Pérez, Marc Marí-Dell'Olmo, and Aurelio Tobías) base their findings on the impact of speed cameras, which were first deployed on the major access routes in and out of Spanish city Barcelona in 2003.