It is unlawful for any person to drive and operate a motor vehicle larger than a one-ton pickup truck on any street in the city, except on streets designated in Section 10.60.010; provided, however, vehicles of larger capacity may be operated from said truck route on other streets when it is necessary to do so for the purpose of making deliveries or for the purpose of picking up merchandise or articles to be transported in such vehicles; provided that, in making such deliveries or pickups, they shall be made from the shortest possible route from the above-named streets; and provided, further, that, upon application of the owner or operator, the city engineer may issue a special permit for the operation of a larger vehicle on other streets where it is necessary to do so, which permit shall specify the street or streets over which such vehicle is to be operated,

the time such permit shall be valid and the gross weight limit.