Hawaii Truck Bans & Hazmat Routes

Where Hawaii keeps trucks out

No commercial-ban parkways. The traps here are low tunnels, not hazmat rules. Oahu's Wilson Tunnel (Likelike Hwy) runs overheight detectors, and the Pali and H-3 Harano tunnels sit on tight mountain grades; the state legal height is 14 feet and anything taller needs an HDOT permit. Honolulu designates truck routes and weight-limited roads. No confirmed statewide hazmat tunnel ban; follow posted routes and 49 CFR 397.

Key restrictions

• State legal height is 14 ft; anything taller needs an HDOT oversize permit
• Wilson Tunnel (Likelike Hwy) uses overheight detectors; Pali and H-3 Harano tunnels sit on tight mountain grades
• Honolulu designates truck routes and weight-limited roads (Revised Ordinances of Honolulu)
• No confirmed statewide hazmat tunnel ban; follow posted routes and 49 CFR 397

• Parkway / road ban: No commercial-ban parkways. Low mountain tunnels and a 14 ft state height limit are the real constraints.
• Hazmat: No confirmed statewide hazmat tunnel ban. Placarded hazmat follows posted state routes and 49 CFR 397; check the FMCSA route registry and HDOT before running Oahu's tunnels. Verify the current rule at the specific tunnel rather than assuming there is or is not a restriction.
• Through-truck routes: Honolulu (City and County) designates truck routes and weight-limited roads under the Revised Ordinances of Honolulu; the neighbor islands rely on state highways. A local delivery keeps reasonable access off the route network by the direct path to its stop.
• Fine: Entering a posted low tunnel over height, or running an oversize load without an HDOT permit, is a citable violation and the strike damage is on you. Truck-route and weight-limit violations fall under the Revised Ordinances of Honolulu. Confirm current fine amounts with HDOT or Honolulu DTS.

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