The department shall have authority as granted to local authorities to determine by resolution and to impose restrictions as to the weight of vehicles, except farm tractors as defined in section 321.1, subsection 24, operated upon any highway under the jurisdiction of the department and the restrictions shall be effective when signs giving notice of the restrictions are erected upon the highway or portion of any highway affected by the resolution. Resolutions imposing restrictions under section 321.473 shall be for a definite period of time not to exceed twelve months. The expiration date of the resolution shall appear on all signs posted as required by this section.
For the purposes of restrictions imposed under this section, a triple axle is any group of three or more consecutive axles where the centers of any consecutive axles are more than forty inches apart and where the centers of the extreme axles are more than eighty-four inches apart but not more than one hundred sixty-eight inches apart. Where triple axle restrictions are imposed, the signs erected by the department shall give notice of the restrictions.
Any person who violates a provision of the resolution, upon conviction or a plea of guilty, is subject to a fine determined by dividing the difference between the actual weight and the maximum weight established by the resolution by one hundred, and multiplying the quotient by two dollars. The department may issue special permits, during periods the restrictions are in effect, to permit limited operation of vehicles upon specified routes with loads in excess of any restrictions imposed under this section, but not in excess of load restrictions imposed by this chapter. The department shall issue special permits in accordance with the foregoing to trucks moving farm produce, which decays or loses its value if not speedily put to its intended use, to market upon a showing to the department that there is a requirement for trucking the produce, or to trucks moving any farm feeds or fuel necessary for home heating purposes.
[C24, 27, 31, 35, § 5066; C39, § 5035.23; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, § 321.474; 81 Acts, ch 110, § 3]
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