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91st General Assembly · Funnel one-pager · Monday, November 9, 2026

HF 529: Relating to the maximum weight of vehicles powered primarily by natural gas or electric battery, and making penalties applicable

Died when the session ended · The General Assembly adjourned on October 2, 2026. Bills that didn’t pass both chambers died.

What it does

Current law limits the maximum gross weight of a vehicle based on the highway on which the vehicle is operated and the number of axles and the distance between the axles on the vehicle. Generally, the maximum gross weight of a vehicle, including combinations of vehicles, is 80,000 pounds when operated on a highway in Iowa. Certain exceptions exist including but not limited to specially permitted vehicles and vehicles with six or seven axles while operated on noninterstate highways. Additionally, a motor vehicle equipped with an engine fueled primarily by natural gas may exceed the standard weight limit and is authorized to weigh up to 82,000 pounds, as long as the vehicle’s excessive weight equals the difference between the weight of the vehicle attributable to the natural gas tank and fueling system installed in the vehicle and the weight of a comparable diesel fuel tank and fueling system.

Sponsors

Transportation committee

Cost

No fiscal note

House subcommittee · named January 20, 2026

  • Rep. Brent Siegrist (R) · brent.siegrist@legis.iowa.gov
  • Rep. Chad Behn (R) · chad.behn@legis.iowa.gov
  • Rep. Elizabeth Wilson (D) · elizabeth.wilson@legis.iowa.gov

Lobbying · 3 for, 0 against

For: Iowa Beverage Association; PepsiCo; Tesla

In plain words

  1. February 6, 2025Filed in the House and sent to the Transportation committee · as HSB 134
  2. February 6, 2025House subcommittee named: Siegrist, Behn and Wilson · as HSB 134
  3. February 13, 2025Subcommittee recommended passing it · as HSB 134
  4. February 19, 2025Approved by the House committee · as HSB 134
  5. February 19, 2025Committee vote: 21–0 · as HSB 134
  6. February 20, 2025Filed in the House
  7. February 20, 2025Approved by the House committee, and given a new number: HF 529 · as HSB 134
  8. April 3, 2025Sent to the House Transportation committee
  9. January 20, 2026House subcommittee named: Siegrist, Behn and Wilson
  10. January 29, 2026Subcommittee recommended passing it
  11. February 4, 2026Approved by the House committee
  12. February 4, 2026Committee vote: 21–0

From public records at legis.iowa.gov, compiled by Funnel (iowafunnel.com), an independent, nonpartisan site. Current as of Monday, November 9, 2026. https://iowafunnel.com/bills/91/HF529