The aim of this project was to recommend content and instructional approach guidelines for a K through 12 traffic safety education curriculum. The specific project requirements were to identify: (1) content requirements for a curriculum; (2) developmental capabilities of school-age children; (3) the most suitable approach for teaching traffic safety to specific ages of learners; and (4) issues affecting implementation, evaluation and research of K-12 traffic safety education programs. In addition, an advisory panel of traffic safety, education and child development experts were consulted to review this project's content and instructional approach recommendations. This volume contains the recommended content and instructional approach guidelines for a K-12 traffic safety curriculum. Included in this document are: an overview of instruction recommended in four traffic safety areas (i.e., occupant, alcohol, pedestrian and bicycle safety); a discussion of estimated teaching time projected for one academic year; the critical information students in grades K through 12 should be taught about traffic safety; and the most suitable approach for teaching traffic safety according to the developmental capabilities of students. Volume I describes the procedures followed in completing the work requirements and the findings.