No private signs, eaves, marquees or similar devices will be allowed to encroach on the public rights of way of this municipality within the incorporated limits, except as provided herein and then only by agreement issued by the proper authorities and revocable on thirty (30) days' written notice to the applicant. No gainful private or commercial use of the public right of way will be allowed. Examples include nonemergency servicing of vehicles, parking or placing of portable advertising devices on the public right of way. (1969 Code §12.20.040)