<p>There is a growing interest in the use of alternatives to traditional police enforcement for reducing traffic violations and crashes, which pose a substantial threat to public safety and impose considerable burdens on police resources. This study examines one such alternative involving the use of civilian auxiliaries (volunteers) to reduce traffic violations through high-visibility presence at locations with a high risk for vehicle crashes. Using a quasi-experimental design in two small cities in Utah, we examine speeding and traffic signal-stop sign violations at high-risk intersections when the locations were patrolled by uniformed civilians in marked vehicles as compared to when the same locations were patrolled by regular uniformed officers. Our results suggest that civilian volunteer patrols can be as effective as regular officers in deterring speeding and other traffic violations. Results from one of the cities also suggest that the effectiveness of civilian patrols can be enhanced when volunteers monitor speeding outside their vehicles and use flashing lights to enhance their visibility. The study highlights an approach to traffic control that may enhance traffic safety while conserving police resources and strengthening police-community collaboration.</p>