No school bus shall be operated within the corporate limits of the city unless a permit for the bus has been obtained from the safety-service director upon application in such form as the safety-service director may prescribe. The permits shall be issued annually between August 1, and August 15, shall be serially numbered, and the serial number of each permit shall be preceded by the last 2 digits of the then current calendar year and shall expire one year from the date of issuance. The safety-service director shall not issue any such permit until he has first ascertained the roadworthiness of the vehicle, the seating capacity thereof, and the compliance with the requirements of § 77.11. Each such permit shall be issued to a specific vehicle and shall not be transferable. Before the vehicle is thereafter operated as a school bus, the serial number of the permit and seating capacity shall be legibly painted in letters and figures not less than 2 inches in height on the right side of the bus near the door. In addition to the other penalties provided by the ordinances of the city, any such permit may be revoked by the safety-service director in the event the director should find that the vehicle to which the permit was issued is unroadworthy or the vehicle should be found not in compliance with the requirements of § 77.11. No fee shall be charged for the permit.
('73 Code, § 74.28) Penalty, see § 77.99