Clearance + restrictionCited official sources
US RV low-clearance master reference
13'6" is the federal minimum but it's an aspiration, not a guarantee. Real US clearance is much lower in places.
The Federal Highway Administration design standard for interstate clearance is 16 feet (with 14 feet minimum for federal-aid highways). The de facto US RV reality is that any vehicle taller than 13 feet 6 inches encounters posted-low-clearance routes frequently. State-by-state variation is significant. The Eastern US has the most low-clearance routes — historical infrastructure predates the federal standard. This page collects the reference data RV travelers need.
Frame: a general RV subject photograph — not a place on this route.
- Tier
- Clearance + restriction
- Sources
- Cited official (.gov / .org)
Why US clearance varies so dramatically
The Interstate Highway System was designed to a 16-foot clearance standard (later reduced to 14 feet in some jurisdictions). The standard was set with future commercial-vehicle and military needs in mind. Federal-aid highways below interstate class were built to 14-foot minimum.
Routes built before the interstate era — much of the Eastern US, particularly New York, Pennsylvania, Massachusetts, Maryland — have bridges and tunnels predating the standard. Many are 11-13 feet. Some are under 10 feet (most famously the Boston North End area).
RV travelers need to think of clearance as state-specific. The Western US is generally RV-friendly above 13 feet. The Eastern US requires careful planning.
Pre-trip clearance verification
Measure your rig's highest point
Including AC units, roof racks, satellite dishes, antennas. Use a stepladder + tape.
Add 6 inches of safety margin
Per FHWA recommendation.
Verify route against state DOT low-clearance map
Most state DOTs publish these. Links below.
Use trucker GPS app
Garmin RV / CoPilot / TruckerPath route by vehicle dimensions.
Don't assume 'I drove this last year' is safe
Bridge repairs reduce posted clearance. New posting may apply.
What FHWA + state DOT clearance maps doesn't tell you
The FHWA design standard is well-documented but the real-world clearance reality is decentralized. Each state DOT maintains its own low-clearance list. PickRV's role is aggregating this for RV travelers.
Trucker apps (Garmin RV, CoPilot, TruckerPath) all maintain clearance databases and route around posted-low bridges by vehicle dimension. These are the practical RV navigation tools.
What's also undercovered: posting is not always accurate. Bridge maintenance may reduce actual clearance below posted. Add safety margin.
Frequently asked questions
- Where are the lowest US clearances?
- NYC region. The Battery Tunnel approaches, the Lincoln Tunnel, and many older Brooklyn bridges are sub-13 feet. Some posted at 11-12 feet.
- Are interstate highways always safe?
- Almost always but verify. Some interstate bridges have posted reductions after repair work.
Authoritative sources
- FHWA 511 traveler information — national index FHWA
- America's Byways — Federal Highway Administration scenic byway program FHWA National Scenic Byways
- New York State 511 State DOT
- PennDOT 511PA State DOT
- Caltrans QuickMap — California road status State DOT
- VDOT 511 Virginia State DOT
Verify current conditions with state DOT 511 systems before departure. RV restrictions may change. Weather may close roads.
Planning an RV trip along US RV low-clearance master reference?
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