Section 1103. Public officers and employees to obey title; exceptions

(a)
  The provisions of this title applicable to the drivers of vehicles  upon
  the highways shall apply to drivers of all vehicles owned or operated by
  the  United  States, this state, or any county, city, town, district, or
  any other political subdivision of the state, except as provided in this
  section and subject to such specific exceptions as are set forth in this
  title with reference to authorized emergency vehicles.
    (b) Unless specifically made applicable, the provisions of this title,
  except the provisions of  sections  eleven  hundred  ninety-two  through
  eleven  hundred  ninety-six of this chapter, shall not apply to persons,
  teams, motor vehicles, and other equipment  while  actually  engaged  in
  work  on a highway nor shall the provisions of subsection (a) of section
  twelve hundred two apply to hazard vehicles while  actually  engaged  in
  hazardous  operation on or adjacent to a highway but shall apply to such
  persons and vehicles when traveling to or from such hazardous operation.
  The foregoing provisions of  this  subdivision  shall  not  relieve  any
  person,  or  team  or any operator of a motor vehicle or other equipment
  while actually engaged in work on a highway from the duty to proceed  at
  all  times during all phases of such work with due regard for the safety
  of all persons nor shall the foregoing provisions protect  such  persons
  or teams or such operators of motor vehicles or other equipment from the
  consequences of their reckless disregard for the safety of others.