RV Height & Weight Restrictions Guide

Why RV Height and Weight Restrictions Matter

Every year, hundreds of RVs and commercial vehicles strike bridges, overpasses, and other low-clearance structures across the United States. The consequences range from embarrassing to catastrophic. A bridge strike can easily cost $10,000 to $100,000 or more in repairs to your rig alone, and that number climbs dramatically when you factor in structural damage to the bridge, traffic disruption, emergency response costs, and potential injuries to yourself or other motorists.

The Federal Motor Carrier Safety Administration (FMCSA) tracks overheight and overweight incidents as part of its crash data, and the numbers are sobering. Bridge strikes account for a significant portion of preventable large-vehicle accidents. Many states have begun installing automated overheight detection systems at problem bridges, but these warning systems only cover a fraction of the structures that could pose a danger to tall rigs.

Overweight violations carry their own set of consequences. Fines for exceeding weight limits vary by state but can run from a few hundred dollars to over $10,000 for serious violations. Some states calculate fines on a per-pound basis for every pound over the limit, which adds up fast. Beyond fines, operating an overweight vehicle accelerates wear on roads and bridges that taxpayers fund, puts additional stress on your own drivetrain and braking systems, and creates genuine safety hazards on steep grades and in emergency stopping situations.

The fundamental problem is that standard GPS navigation apps like Google Maps, Apple Maps, and Waze were designed for passenger cars. They have no concept of vehicle height, weight, or length. They will happily route a 13-foot-tall fifth wheel under a 10-foot bridge or send a 40,000-pound combination rig down a road with a 10-ton weight restriction. For RV owners, relying on these apps without understanding your rig's dimensions is a gamble you will eventually lose.

Federal Height and Weight Limits for RVs

Height Limits

There is no single federal height limit for vehicles in the United States. This surprises many RV owners, but it is an important distinction. What the federal government does establish is a minimum vertical clearance standard: all routes on the Interstate Highway System must provide at least 14 feet of clearance, and the standard design specification for interstate overpasses is 16 feet. In practice, most interstate bridges offer between 14 and 16.5 feet of clearance.

The commonly cited figure of 13 feet 6 inches (13'6") is not a federal height limit but rather the maximum height that most states allow without requiring an oversize permit. This number became a de facto standard because the trucking industry settled on it decades ago, and trailer manufacturers generally build to that specification.

For RV owners, the picture is more nuanced. A large Class A motorhome with rooftop air conditioning units and a satellite dish can easily reach 12 to 13 feet or more. A fifth wheel or toy hauler may sit even taller depending on the truck's suspension height and the trailer's design. The danger is not usually on interstates, where clearances are generous, but on secondary roads, parkways, older state highways, and urban underpasses where clearances can drop well below 13 feet.

Weight Limits

Federal weight limits are more clearly defined. On the Interstate Highway System, the maximum gross vehicle weight is 80,000 pounds, the maximum single axle weight is 20,000 pounds, and the maximum tandem axle weight is 34,000 pounds. The federal bridge formula further governs the relationship between weight and axle spacing to protect bridge structures.

Most recreational vehicles fall well below these interstate maximums, but that does not mean weight is not a concern. The numbers that matter for RV owners are:

• GVWR (Gross Vehicle Weight Rating): The maximum allowable weight of a single vehicle, including the vehicle itself, all passengers, cargo, fluids, and accessories. Your tow vehicle has a GVWR, and your trailer has a separate GVWR. Exceeding either one is both illegal and dangerous.
• GCWR (Gross Combined Weight Rating): The maximum allowable weight of the tow vehicle plus the trailer plus everything in both. This is the total weight of your entire rig as it rolls down the road. Your tow vehicle's manufacturer sets this number, and it is non-negotiable.
• Tongue Weight (or Pin Weight for fifth wheels): The downward force the trailer exerts on the hitch. This should generally be 10-15% of the trailer's total weight for conventional hitches and 15-25% for fifth wheels. Too little tongue weight causes dangerous trailer sway. Too much overloads your tow vehicle's rear axle and can exceed payload capacity.
• Payload Capacity: How much weight you can add to the tow vehicle beyond its curb weight. This includes passengers, cargo in the truck bed, and the tongue/pin weight of the trailer. This is often the limiting factor that people overlook. A half-ton truck with four passengers, gear in the bed, and a heavy trailer tongue weight can easily exceed its payload rating.

Operating above any of these ratings degrades braking performance, accelerates component wear, voids warranties, and creates liability exposure in the event of an accident. If you are involved in a collision and your rig is found to be overweight, your insurance company may deny the claim.

State-by-State Variations

While federal standards establish a baseline, individual states have the authority to set their own height and weight limits on state-maintained roads. This creates a patchwork of regulations that can catch even experienced RV travelers off guard.

Some notable state variations include:

• New York: The state parkway system is notorious for low-clearance bridges, some as low as 7 feet 6 inches on older parkways like the Hutchinson River Parkway and Saw Mill River Parkway. Commercial vehicles and trailers are prohibited on parkways entirely, but GPS apps do not always know this.
• Massachusetts: Storrow Drive in Boston has bridges as low as 10 feet, and "Storrowing" (striking one of these bridges) has become so common it has its own verb. The state has a general height limit of 13'6" on most roads.
• Washington, D.C.: Multiple parkways and underpasses in the capital region have restricted clearances, often poorly marked.
• Pennsylvania: Height limit of 13'6" on most roads, but many older covered bridges and underpasses have lower clearances, particularly in rural areas.
• Georgia: Allows vehicles up to 13'6" without a permit. The state has invested in overheight detection systems on many interstate overpasses.
• Texas: Generally permits heights up to 14 feet, making it one of the more generous states for tall rigs.
• Oregon: Height limit of 14 feet on most state highways, but mountain passes and older routes may have lower clearances.
• Connecticut: The Merritt Parkway has numerous low-clearance bridges, some under 11 feet, and prohibits commercial vehicles and trailers.

Weight limits on state and local roads can be significantly lower than federal interstate limits. Many rural bridges have posted weight limits of 10, 15, or 20 tons. County roads and seasonal roads may have even lower limits, especially during spring thaw when the ground is soft and road surfaces are vulnerable to damage from heavy vehicles.

For a detailed breakdown of low-clearance hazards in each state, see our Low Clearance Bridges by State guide.

How to Know Your Rig's Dimensions

Knowing your exact dimensions is the foundation of safe RV travel. Estimates and assumptions are not good enough when the margin between clearing a bridge and striking it can be a matter of inches.

Measuring Your Height

Your rig's height must be measured from the ground to the absolute highest point, and that measurement must be taken when the vehicle is fully loaded and on a level surface. The highest point is often not the roofline itself but rather a rooftop air conditioning unit, a satellite dish, a CB antenna, or a roof rack. For tow-behind rigs, the height changes depending on the tow vehicle's suspension. A truck with air suspension that auto-levels under load may sit at a different height than when unloaded.

To measure accurately:

1. Park on a level surface with the rig fully loaded as it would be for travel.
2. Extend a straight edge (a long board or level works well) horizontally from the highest point of the rig outward.
3. Measure from the ground to the bottom of the straight edge.
4. Add 3 to 6 inches as a safety margin. Bridge clearance signs can be inaccurate due to road repaving, settling, or measurement methods.
5. Write this number down and tape it to your dashboard where you will see it every time you drive.

Finding Your Weight Specifications

Your rig's weight ratings can be found in several places:

• Federal certification label (door sticker): Located on the driver's side door jamb of both the tow vehicle and the trailer. This shows GVWR, GAWR (axle ratings), and tire specifications.
• Owner's manual: Contains GVWR, GCWR (for tow vehicles), payload capacity, and towing capacity.
• Manufacturer's website: Usually has detailed specification sheets for each model and trim level.
• NHTSA VIN lookup (vpic.nhtsa.dot.gov): Decode your VIN to find factory specifications including weight ratings.

Weigh Your Rig

Specifications tell you the maximum ratings, but you need to know your actual weights. The only way to know how much your rig actually weighs is to put it on a scale. CAT Scales (catscale.com) are available at most truck stops nationwide and cost $12 to $15 per weigh. This is one of the best investments you can make in RV safety.

A proper weigh involves three measurements: the tow vehicle's steer axle alone, the tow vehicle's drive axle alone, and the trailer axles alone. This lets you calculate individual axle weights, total tow vehicle weight, tongue/pin weight, and gross combined weight. Weigh your rig fully loaded for travel, with full fuel and water tanks, all your gear, and typical passenger count.

Rig-Aware Navigation: The Modern Solution

The gap between standard GPS apps and the needs of RV travelers is where costly mistakes happen. Consumer navigation apps optimize for the fastest or shortest route without any consideration of vehicle dimensions. They cannot warn you about a 12-foot bridge ahead because they do not know your rig is 12 feet 8 inches tall. They cannot flag a 15-ton weight-restricted bridge because they do not know you are towing 18,000 pounds.

CrewRV takes a fundamentally different approach. When you create a rig profile in CrewRV, you enter your tow vehicle and RV dimensions: height, width, length, weight, and GVWR. Every route that CrewRV plans is checked against these dimensions. The routing engine considers bridge clearances, weight-restricted roads, and roads with vehicle-type restrictions. If a route would take you under a bridge that your rig cannot clear or over a road that cannot support your weight, CrewRV finds an alternative.

This rig-aware routing pulls restriction data from multiple sources, including Department of Transportation databases and OpenStreetMap's extensive catalog of infrastructure attributes. Restrictions are matched against your specific rig profile, not a generic vehicle class. A 12-foot-tall Class C motorhome has different constraints than a 13-foot-4-inch fifth wheel behind a lifted truck, and CrewRV treats them accordingly.

CrewRV checks your rig dimensions against every route automatically, so you never have to wonder whether you will fit. The route you see on screen is a route your rig can safely travel. Join the waitlist to be first in line when we launch.

Tips for Safe RV Travel

Even with rig-aware navigation, good habits and awareness are your best defense against height and weight incidents. Here are the practices that experienced RV travelers follow:

• Re-measure after any modification. Installing a new rooftop air conditioner, satellite dish, roof rack, or even swapping to taller tires changes your height. Any time you modify the top of your rig or change your suspension, re-measure and update your records.
• Use truck-specific routes when available. Even if you are not a commercial truck, the routes that trucks use are designed for large vehicles with higher clearances and stronger bridges. If your navigation offers a truck routing option, use it.
• Weigh your rig at a CAT scale before every long trip. Your weight changes from trip to trip as you pack differently, carry more or less water, or add new gear. A $15 weigh is cheap insurance against a weight violation or, worse, an accident caused by overloaded brakes on a mountain grade.
• Post your dimensions where you can see them. Tape a card to your dashboard with your total height, total length, and gross combined weight. When you see a clearance sign or weight limit sign, you want instant recall, not a guessing game.
• When in doubt, do not chance it. If you are approaching a bridge or underpass and the clearance looks tight, stop. Do not try to "thread the needle." Find an alternate route, even if it adds 30 minutes to your drive. The time you lose is nothing compared to the cost and danger of a strike.
• Watch for road repaving. When a road is repaved, the surface gets slightly higher, which reduces the effective clearance under every overpass on that road. A bridge that was 13 feet 6 inches when it was built may be 13 feet 2 inches after several rounds of repaving.
• Be cautious in parking structures. Parking garages often have clearances of 7 to 8 feet, far too low for any RV or truck with a camper. Even gas station canopies can be a problem for very tall rigs. Always check posted clearances before pulling in.
• Plan fuel stops at truck-friendly stations. Large fuel station chains like Love's, Pilot, and Flying J are built to accommodate tall, heavy vehicles. Their canopies are higher, their turning radii are larger, and their pumps can handle diesel rigs. Planning your fuel stops at these locations avoids the risk of getting stuck under a low canopy at a standard gas station.

Height and weight restrictions are not obstacles designed to inconvenience RV travelers. They exist to protect infrastructure, other road users, and you. Understanding your rig's dimensions, knowing the regulations, and using navigation tools that account for your vehicle's size are the pillars of safe, stress-free RV travel. Take the time to know your numbers, and the road ahead becomes a lot less uncertain.