6 chapters total
FEDERAL-AID HIGHWAYS (§§ 101 – 181)
OTHER HIGHWAYS (§§ 201 – 219)
GENERAL PROVISIONS (§§ 301 – 332)
HIGHWAY SAFETY (§§ 401 – 412)
RESEARCH, TECHNOLOGY, AND EDUCATION (§§ 501 – 520)
INFRASTRUCTURE FINANCE (§§ 601 – 611)