Whenever any time limit regulating stopping, standing or parking of vehicles for time
periods of less than 24 hours is imposed, or any prohibition is imposed, by this division
or ordinance of the city, it shall be the duty of the director of public works to
erect appropriate signs giving notice thereof and no such regulations shall be effective
unless such signs are erected and in place at the time of the offense charged. The
director of public works may, but is not required to, erect such signs at such locations
as he determines to be appropriate to give notice of the 24-consecutive hour parking
or standing restricting imposed by this division.
