When signs are placed, erected or installed in each block giving notice thereof, no person shall park a vehicle between the hours of 1:00 a.m. and 6:00 a.m. upon any of the streets as may be so designated by the Board of Commissioners, unless other hours are designated; provided that this section shall not apply to automobiles or other vehicles parked on those streets between the hours of 1:00 a.m. and 6:00 a.m. when the owners thereof are at work in the building or on the premises in front of which, or near which, the automobiles or other vehicles are parked.
(Prior Code, § 72.21) Penalty, see § 70.99