When, because of restricted visibility or when standing or parked vehicles constitute a hazard to moving traffic, or when other traffic conditions require, the Chief of Police may cause curbs to be painted with a yellow or orange color and erect "no parking" or "standing" signs. It shall be unlawful for the operator of any vehicle to stand or park a vehicle in an area so painted or sign-posted. It shall be unlawful for any person, other than after having first secured the permission of the Chief of Police, to paint any curbing, sidewalk or street with yellow or orange colored paint or to erect "no parking" signs.
(Code of Iowa, Sec. 321.358(10))