Title 23 presents regulations by the Federal Highway Administration and the National Highway Traffic Safety Administration detailing planning and research, engineering and traffic operations, right-of-way and environment, public transportation, and highway safety.

Title 23 presents regulations by the Federal Highway Administration and the National Highway Traffic Safety Administration detailing planning and research, engineering and traffic operations, right-of-way and environment, public transportation, and highway safety. Additions and revisions to this section of the code are posted annually by April. Publication follows within six months.