Whenever in the judgment of the safety-service director and city council any highway or part thereof would be injured or damaged by general use by vehicles having solid tires or by vehicles exceeding in gross weight or in weight per inch of tire width the limits which he shall determine to be safe for such highway or part thereof, he shall erect appropriate traffic signs prohibiting the operating of vehicles having solid tires, or indicating and designating such weight limits, and it shall be unlawful to operate over any highway, or part thereof, any vehicle having solid tires or exceeding the weight limits, without securing a permit as provided in § 74.46.
('73 Code, § 71.42)