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Federal regulations
Iowa has adopted Part 393 of the Federal Regulations.
Applicability
Part 393 applies to motor vehicles that have a gross vehicle weight, gross vehicle weight rating, gross combination weight, or gross combination weight rating of 10,001 pounds or more, or hauling hazardous materials required to be placarded.
Part 393 does not apply to combination vehicles provided the gross vehicle weight rating of the power unit is 10,000 pounds or less and the gross combination weight rating is 26,000 pounds or less.
First aid kit
No requirements.
Studded tires
No tires may have blocks, studs, flanges, cleats, spikes or other protuberances of any material other than rubber which project beyond the tread surface.
Exception — From November 1 to April 1, a vehicle may use pneumatic tires with inserted ice grips or tire studs projecting not more than one-sixteenth inch beyond the tread of the traction surface of the tire.
Tire chains
Tire chains of reasonable size may be used on any vehicle when required for safety because of snow, ice, or other conditions tending to cause a vehicle to skid.