Wyoming Truck Bans & Hazmat Routes

Where Wyoming keeps trucks out

Wyoming has no parkway ban, and the I-80 Green River tunnels are no longer the trap they were. WYDOT reopened both bores to two lanes in late June 2026 at the regular posted 65, which lifted the 8 ft 6 in legal-loads-only restriction that stood after the February 2025 fire. Legal-width loads run straight through. Oversize loads still clear routing with the Highway Patrol oversize permit office and may be sent onto Flaming Gorge Way through Green River. I-80 still closes for wind and hazmat crashes on short notice.

Key restrictions

• I-80 Green River tunnels fully reopened in late June 2026; both bores run two lanes at the regular posted 65 and the 8 ft 6 in legal-loads-only restriction is lifted
• Oversize loads still clear routing with the Wyoming Highway Patrol oversize permit office, which may route you off I-80 onto Flaming Gorge Way through Green River
• I-80 closes for high wind and hazmat crashes with little notice; watch WYDOT 511 and the gate signals
• No parkway ban; placarded loads follow 49 CFR 397 and the FMCSA registry

• Parkway / road ban: No parkway or commercial-vehicle bans. The notable choke is the I-80 Green River tunnel width restriction, not a cars-only ban.
• Hazmat: No metro tunnel hazmat ban. I-80 is the main placarded-hazmat corridor across the state and closes for hazmat crashes and high wind on short notice. Placarded loads default to the Interstates and any Wyoming-designated routes in the FMCSA registry (49 CFR 397).
• Through-truck routes: Small metros (Cheyenne, Casper, Laramie) post local truck routes. The I-80 Green River tunnels are back to normal. WYDOT reopened the westbound bore and pulled the barrier out of the eastbound bore in late June 2026, which lifted the 8 ft 6 in legal-loads-only restriction that had stood since the fatal February 2025 fire, and both bores now run two lanes at the regular posted 65. Legal-width loads go straight through. Oversize loads still clear their routing with the Wyoming Highway Patrol oversize permit office, which may send you off the interstate onto Flaming Gorge Way through Green River. Federal reasonable access to terminals, fuel and services still applies.
• Fine: Running an over-width or over-height load through the restricted Green River tunnels or off the permitted detour is an oversize/permit violation with civil penalties that vary by configuration. Hazmat routing follows state and federal penalties. Confirm current amounts with WYDOT ports of entry.

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