Iowa Code § 321.452: Scope and effect.

1. A person shall not drive or move, and the owner of such vehicle shall not cause or knowingly permit to be driven or moved, on any highway any vehicle or vehicles of a size or weight exceeding the limitations stated in this chapter, and the maximum size and weight of vehicles herein specified shall be lawful throughout this state, and local authorities shall have no power or authority to alter said limitations except as express authority is granted in this chapter.

2. A person who violates this section commits a simple misdemeanor.