Guide
Propane restrictions and tunnels
Some tunnels ban RV propane outright, some let you through with the tank valve off, and the rules aren't posted where you'd notice at 60 mph. Here's how to know before you get there.
Last updated: October 2026
Before you rely on this
Tunnel propane rules are set by each operating authority and change without much notice. Use the table below to plan, but confirm the current rule with the tunnel's authority — and obey posted signs at the tunnel, which always win. The one rule that's always safe: turn your propane off before every tunnel and ferry.
Major tunnels at a glance
| Tunnel / crossing | Location | RV propane | Notes |
|---|---|---|---|
| Fort McHenry Tunnel (I-95) | Baltimore, MD | No propane | Propane over 10 lb per container prohibited — full or empty. RVs effectively can't take it through. |
| Baltimore Harbor Tunnel (I-895) | Baltimore, MD | No propane | Same 10-lb-per-container prohibition. Take the designated beltway detour around the tunnels. |
| Sumner, Callahan, Prudential, Dewey Sq. | Boston, MA | No propane | Boston's harbor/downtown tunnels are propane-restricted — route around them. |
| Holland & Lincoln Tunnels | NYC (NJ ↔ Manhattan) | No propane | LP-gas prohibited. Use a bridge crossing instead. |
| Hugh L. Carey & Queens-Midtown | New York City | No propane | All flammable/hazmat gas prohibited. Route via bridges. |
| Hampton Roads & Monitor-Merrimac | Hampton Roads, VA | Stop & inspect | Allowed, but you must stop so tanks are checked/shut off before entering. |
| Chesapeake Bay Bridge-Tunnel (US-13) | Cape Charles, VA | Valve off | Allowed within cylinder limits with valves closed; inspected at the toll plaza. |
| Eisenhower-Johnson Tunnel (I-70) | Colorado | Valve off | RV house propane generally allowed (below placard quantity); shut it off before entering. |
| PA Turnpike tunnels | Pennsylvania | Valve off | RV propane generally allowed with the tank shut off and appliances off. |
Why tunnels restrict propane
Propane is heavier than air, so a leak in an enclosed, low-lying tunnel can pool where it can't disperse — that's the safety rationale authorities cite. Underwater and downgrade tunnels are the strict ones; open mountain tunnels are usually far more relaxed about RV-sized propane.
The three rules you'll actually meet
- Prohibited outright. No propane over a small limit, full or empty — there's no valve-off workaround. You route around (a bridge or beltway). The Baltimore, Boston, and Manhattan tunnels fall here.
- Allowed with the valve off. Most restricted-but-passable tunnels: propane is fine up to a container-size limit as long as the service valve is closed and appliances are off while you cross.
- Empty or purged. Rare for RV house propane — it's mostly a rule for bulk hazmat transport, not the tank feeding your fridge.
Know your container weight
The strictest tunnels draw the line at 10 pounds of gas per container — and a standard RV tank or even a 20-pound "BBQ" cylinder already exceeds that. So at the tunnels that set a low limit, an RV usually isn't close to qualifying; assume you'll route around rather than squeak under a threshold.
The habit that covers you everywhere
You can't memorize every authority's rulebook, so don't try. Turn your propane off — at the tank — before every tunnel and every ferry. Switch the fridge to its off or 12-volt mode a little ahead of time so it stays cold. Where a tunnel bans propane entirely, valve-off isn't enough; you have to take the alternate route.
How RV Compass warns you
Tell RV Compass your rig carries propane once, in the rig profile. From then on, any road or tunnel on your route that's closed to propane or hazmat shows up as a propane caution in the route report, with the tunnel named when the map data has it. Tap the row and the map flies to it. The printed turn-by-turn lists it too, as still on the route.
In the cab, the app says it once, about 2 miles out: "Propane restriction in 2 miles. Check local rules." That's your cue to shut the valve or take the posted alternate before you're committed to the approach.
RV Compass does not route you around these tunnels. Propane carried for your RV's own use isn't hazmat cargo, and routing every propane rig as a hazmat truck pushed big rigs off the interstate and onto frontage roads and city streets to dodge closures that mostly apply to tankers. A warning you can act on beats a detour you didn't need. We wrote up the reasoning in why we warn instead of avoid. When the data is unclear, it warns rather than staying quiet.
Learn more in RV-safe GPS explained and big-rig route planning.
Frequently asked questions
Can I drive my RV through a tunnel with propane?
Sometimes. It depends entirely on the tunnel. Some tunnels prohibit propane outright (you must take the posted alternate route), while others allow it only if the tank valve is closed and appliances are off. Because the rules vary by facility and change over time, the safe habit is to turn propane off before every tunnel and to plan with a tool that warns you before the ones that ban it.
Which tunnels ban RVs from carrying propane?
As of writing, the Baltimore tunnels (Fort McHenry and Harbor), Boston's harbor and downtown tunnels, and the Manhattan tunnels (Holland, Lincoln, Hugh L. Carey, and Queens-Midtown) prohibit propane, so RVs must take a bridge or beltway around them. Always confirm current rules with the operating authority, since these change.
Do I have to turn my propane off in a tunnel?
Yes — make it a universal habit. Even where propane is allowed, nearly every restricted tunnel and most ferries require the service valve closed and appliances (fridge, furnace, water heater) off while crossing. Switch the fridge to its off or 12-volt mode ahead of time so food stays cold.
How do I avoid propane-restricted tunnels?
Know where they are before you leave. Check the route for tunnels, look up each authority's propane rule, and plan the bridge or beltway alternate for any that ban it. RV Compass helps with the first part: if your rig profile says you carry propane, every propane-restricted tunnel left on the route shows as a propane caution in the route report, and in navigation the app says it out loud about 2 miles before you get there. It doesn't reroute you around them, so you decide whether to shut the valve or take the alternate. Posted signs at the tunnel always win.
Hear about the tunnel before you reach it
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