Where it has been determined that any city bridge has a capacity less than the maximum permitted on the streets of the city, or on the street serving the bridge, the Council may cause to be posted and maintained signs, in accordance with Chapter 71 of this Traffic Code, on the bridge and at suitable distances ahead of the entrances thereof to warn drivers of the maximum load limits, and no person shall drive a vehicle weighing, loaded or unloaded, upon the bridge in excess of the posted limit.
(Iowa Code § 321.471) (1999 Code, § 66.04) Penalty, see § 10.99