Hawaii commercial vehicle weight limits follow the federal Interstate standard of 80,000 lbs gross, 22,500 lbs per single axle, and 34,000 lbs per tandem axle group. The federal bridge formula (23 U.S.C. 127) applies on all routes. No seasonal weight restrictions on Interstate highways. Oversize and overweight permits are available from HI DOT for loads exceeding standard limits. Verify current road-specific postings with the Hawaii DOT before routing heavy loads.
The federal bridge formula limits the weight on any group of axles based on the distance between the outermost axles in the group. It applies in Hawaii on all routes where federal standards apply.
W = maximum weight in lbs · L = axle spacing in feet · N = number of axles
HDOT Highways Division issues oversize/overweight permits for all islands. Each island has its own permitting considerations — Oahu is managed by the City and County of Honolulu for county roads, while state highways are managed by HDOT. Neighbor island permits coordinate with respective county highway divisions (Maui County, Hawaii County, Kauai County). All inter-island equipment moves require marine or air transport — coordinate with shipping companies for barge transport of heavy equipment between islands.
Apply for Hawaii OS/OW Permit →On Hawaii's major highways (H-1, H-2, H-3 on Oahu and state highways on neighbor islands), the maximum gross vehicle weight is 80,000 lbs. Hawaii's single axle limit of 22,500 lbs is slightly higher than the federal 20,000 lb standard. All Hawaii truck operations are intrastate — there is no interstate trucking in Hawaii.
No. Hawaii does not impose seasonal spring weight restrictions. The tropical climate means Hawaii roads do not experience freeze-thaw damage. However, flooding from heavy rainfall (especially in windward areas and during La Nina years) can temporarily close roads or impose weight-based restrictions due to structural concerns — monitor HDOT road condition reports during heavy rain events.
Neighbor islands (Maui, Hawaii Island, Kauai, Molokai, Lanai) have both state highway and county road systems, each with their own weight limit authority. Rural roads and older bridges on neighbor islands often have significantly lower weight limits than Oahu's more developed system. Before routing heavy loads on any neighbor island, verify limits with both HDOT and the relevant county highway division.
There are no inter-island roads or bridges — all equipment moves between Hawaiian islands must go by ship or air. Young Brothers Ltd. operates the primary inter-island barge service and handles most heavy construction equipment, vehicles, and cargo. Oversized or very heavy equipment requires coordination with Young Brothers' special loads division. Plan significantly more lead time than a mainland equipment move.
HDOT Highways Division issues oversize/overweight permits for state highways. For Oahu county roads, apply through the City and County of Honolulu's Department of Transportation Services. Maui, Hawaii, and Kauai counties have their own permitting processes. Due to the limited road network and bridge constraints on all islands, HDOT and county permit offices will carefully review routing for any overweight load.
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Disclaimer
The information on this page is compiled from publicly available government sources and is provided for general informational purposes only. TruckRadar is an independent search engine — we are not affiliated with any government agency and this content does not constitute legal or compliance advice. Regulations change frequently; always verify current requirements directly with the official source before making compliance decisions.
Official source: Hawaii HI Department of TransportationLast reviewed: 2026-04