Officers of the Police Department and such officers as are assigned by the Chief of Police are authorized to direct all traffic by voice, hand, audible or other signal in conformance with traffic laws, except that in the event of a fire or other emergency or to expedite traffic or to safeguard pedestrians, officers of the Police Department or members of the Fire Department may direct traffic as conditions may require, notwithstanding the provisions to the contrary contained in this chapter or the Vehicle Code.
(Ord. 34 § 4-3.301, 1980)
No person shall interfere with or obstruct in any way any police officer or other officer or employee of this City in their enforcement of the provisions of this chapter. The removal, obliteration or concealment of any chalk mark or other distinguishing mark used by any police officer or other employee or officer of this City in connection with the enforcement of the parking regulations of this chapter shall, if done for the purpose of evading the provisions of this chapter, constitute such interference or obstruction.
(Ord. 34 § 4-3.302, 1980)
(a) 
The provisions of this chapter regulating the parking or standing of vehicles shall not apply to any vehicle of a City department or of a public utility while necessarily in use in construction or repair work, or any vehicle owned or operated by the United States Postal Service while in use for the collection, transportation, or delivery of United States mail.
(b) 
The foregoing exception shall not, however, relieve the operator of any such vehicle from the obligation to exercise due care for the safety of others, or the consequences of his or her wilful disregard for the safety of others.
(Ord. 34 § 4-3.303, 1980)
Any regular sworn police officer of the Police Department may remove or cause to be removed any vehicle:
(a) 
That has been parked or left standing upon a street for 72 consecutive hours;
(b) 
Which is parked or left standing upon a street between any specified hours when such parking or standing is prohibited by the Municipal Code or by authorization of the Traffic Engineer and signs are posted giving notice of such prohibition and removal;
(c) 
Which is parked or left standing upon a street where access to such street or a portion thereof is necessary for cleaning, repair, or construction thereof or therein, or when the use of the street or portion thereof is authorized for a purpose other than for the normal flow of traffic, or when the use of the street or portion thereof is necessary for the movement of equipment, articles, or structures of such size that such movement would be impeded by parked vehicles; provided, that signs giving notice of prohibition of parking and removal of vehicles are posted at least 24 hours prior to the beginning of the period of prohibition.
(Ord. 34 § 4-3.304, 1980)