No vehicle used for the transportation of flammable
or combustible liquids shall be left unattended on any public street,
road or highway unless the brakes on such vehicle have been set. Parking
shall be limited to one hour; however, during actual loading or discharging
operations, the driver shall be present at the vehicle. When delivering
fuel oil to storage tanks for oil-heating equipment, the driver may
remain at the fill location. After sunset such vehicles temporarily
parked on public thoroughfares shall be required to have their parking
lights turned on and shall be placed, where possible, in the vicinity
where streetlighting is of sufficient intensity to illuminate the
vehicle.