Wyoming Truck Bans & Hazmat Routes

Where Wyoming keeps trucks out

Wyoming has no parkway ban, but the I-80 Green River tunnels are the trap. After a fatal February 2025 fire the westbound bore reopened in late October 2025, still held to 8 ft 6 in wide and 16 ft high at 35 mph until both spans run two lanes. Anything wider or taller exits and runs Flaming Gorge Way through Green River. Confirm the current limit with WYDOT first. I-80 also closes for wind and hazmat crashes on short notice.

Key restrictions

• I-80 Green River tunnels held to 8 ft 6 in wide and 16 ft high after the fatal February 2025 fire; the westbound bore reopened in late October 2025 with those limits and a 35 mph cap
• Confirm the current tunnel width and height limits with WYDOT ports of entry before you arrive; the limits stay until both spans run two lanes
• 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 routing trap is the I-80 Green River tunnels: after a fatal February 2025 fire the westbound bore reopened in late October 2025 but still limits vehicles to 8 ft 6 in wide and 16 ft high at 35 mph until both spans run two lanes. Over-width or over-height loads leave the interstate and run 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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