The city traffic engineer shall not designate or sign any curb loading zone upon special request of any person unless such person makes application for a permit for such zone and for two signs to indicate the ends of each such zone. The city traffic engineer upon granting a permit and issuing such signs shall collect from the applicant and deposit in the city treasury a service fee of ten dollars per year or fraction thereof and may by general regulations impose conditions upon the use of such signs and for reimbursement of the city for the value thereof in the event of their loss or damage and their return in the event of misuse or upon expiration of permit. Every such permit shall expire at the end of one year.