Iowa

Iowa interstate GVW limit: 80,000 lbs. Per-axle limits: Single axle 20,000 lbs, Tandem axle 34,000 lbs, Tridem axle 42,000 lbs. Federal bridge formula applies.

Height: 13 ft 6 in. Width: 8 ft 6 in. Trailer length: 53 ft (semitrailer). Overall combination length: No overall limit for tractor-semitrailer.

Oversize/overweight permits through Iowa DOT Motor Vehicle Division Fees: Single-trip: $10+; ton-mile fees may apply. Hawaii oversize permits are not directly honored in Iowa. You will need to obtain a Iowa-specific permit for oversize/overweight loads. Apply online: https://iowadot.gov/motor-carriers/how-do-i-get-oversize-overweight-permits Enforcement: Weigh stations; roving enforcement on interstates and state highways.

Agricultural: Agricultural vehicles exempt on state highways during harvest; grain carts and combines exempt.

Spring weight restrictions on county roads from March through May. Check with the state DOT for current postings and dates before planning your route.

For the most current weight and size regulations, permit applications, and seasonal restriction updates, visit the official Iowa DOT page at https://iowadot.gov/motor-carriers/. Contact the Iowa Department of Transportation for specific routing questions.