Section 15-206. Fire hose

It  shall  be unlawful for the operator of any
  vehicle to drive over or across any hose in use, or about to be used, or
  while lying in the street  after  being  used  by  the  department.  The
  provisions of this section shall not apply to drivers of wagons carrying
  the  United States mail, nor to drivers of ambulances when conveying any
  patient or injured person to any hospital, or  when  proceeding  to  the
  scene  of any accident by which any person or persons have been injured,
  nor to the operator of any vehicle directed or permitted to  drive  over
  or  across  any such hose by the officer of the department in command of
  the force operating at a fire or other emergency.