The provisions of this chapter shall apply to the driver of any vehicle owned by or used in the service of the United States Government, any state, county, city or other governmental unit or agency, as well as to other vehicles. It is unlawful for any driver to violate any of the provisions of this chapter, except as otherwise permitted in this chapter or by state statute. This chapter shall not apply to the military forces of the United States and organizations of the National Guard when performing any military duty.
(`90 Code, § 20-8)