Volume 6 of the 19-volume Highway Safety Program Manual (which provides guidance to State and local governments on preferred safety practices) concentrates on codes and laws. The purpose and specific objectives of the Codes and Laws Program, Federal authority in the area of highway safety, and policies regarding traffic regulation are described. Program development and operations (the need for a study officer, a comparison of State traffic laws with the Uniform Vehicle Code, and achievement of intrastate uniformity) are presented. Criteria for program evaluation and evaluation procedures are specified. Different types of reports (on traffic laws and ordinances, on program evaluation, and for the National Highway Traffic Safety Administration) are explained. Local government participation is outlined. Appendixes contain the Highway Safety Program Standard Six, Codes and Laws; a glossary of definitions; references; a list of representative projects, and a list of resource organizations. (NH)