Citizen science has emerged as a valuable methodological approach across several scientific fields, offering cost-effective strategies to collect data in contexts or geographic regions that are difficult for researchers to access. In the field of traffic psychology, citizen science can be applied to investigate environmental factors that influence road safety, especially in areas where direct researcher presence is limited. Between 2021 and 2023, we developed a citizen science protocol specifically designed to support research in school settings. In 2024, this protocol was implemented in a study conducted in a state in southern Brazil, aiming to assess the traffic environment and the presence of safety-related signage around schools. A total of 562 students from 6th to 12th grades, supervised by their teachers, participated as citizen scientists and collected data on the surroundings of 67 schools. Among the results, 46.27% of the schools lacked speed limit signs on the street directly in front of them, 19.40% had posted limits of 40 km/h or higher, and 19.40% had no sidewalks in front of the school. This situation makes it difficult for drivers to understand what behavior is safest for that context and for children and adolescents to adopt protective behaviors, such as walking on sidewalks. These are some of the findings generated by this initiative, which also revealed other relevant issues regarding the safety of school surroundings. Overall, the project highlights two key contributions: (1) it provided children and adolescents with an opportunity to learn how to assess traffic safety conditions, and (2) it generated empirical evidence that can be used to advocate for decision-makers to implement structural changes to improve traffic safety around schools. These results can support the development of evidence-based public policies aimed at creating safer environments for children and adolescents in school areas.