When signs are placed, erected or installed giving notice thereof, or the curbing has been painted yellow in lieu of the signs, no person shall park a vehicle at any time in any zone designated as a no-parking zone. If parking is prohibited in the zone only between certain hours, this section shall apply only between such hours, as indicated on the signs erected in the zone.
(`90 Code, § 11-207)  Penalty, see § 72.99