While oversize loads represent a small fraction of total freight miles, they require a comparatively larger percentage of time to manage due to regulations and permitting.
The Federal Highway Administration (FHWA) collects information on state permitting processes, but does not publish a nationwide count of oversize shipments. While it’s safe to say that they represent a minority of total freight shipped by truck, the FHWA does report that since nearly every state has implemented automated permitting systems, the number of oversize permits has increased.
Most of the regulation of freight moving by truck is handled by the individual states, each with its own regulations, permitting and reporting practices. The federal government does have some minimum standards that states must allow on the National Network of interstate highways.
Let’s take a look at how oversize load dimensions are addressed at the state and federal level, the different categories of freight and how they’re handled, and what’s involved in the permitting process.
There are three basic categories of freight trucked on the nation’s highways and roads. When it meets a state’s baseline dimensions (height, width, length, weight), no permit is needed. When it goes beyond any of these, a permit is required. In cases where things like large equipment, heavy machinery or prefab houses are involved, the freight is known as a “superload.”
The FHWA has established minimum standards for freight dimensions and weight that each state must adhere to for trucked freight traveling on the National Network. They are as follows:
|
Dimension |
Federal Standard |
|
Width |
102 inches (8 feet 6 inches) |
|
Semitrailer length |
48 feet |
|
Twin trailers |
28.5 feet each |
|
Gross vehicle weight |
80,000 lbs |
|
Single axle weight |
20,000 lbs |
|
Tandem axle weight |
34,000 lbs |
Note there is no federal standard for load height, which is entirely regulated by the states. It ranges from 13 feet 6 inches (27 states) to 14 feet (20 states), 14 feet 6 inches (Colorado and Nebraska) and 15 feet (Alaska). Variations in state truck height limits are largely the result of differences in highway, bridge, and infrastructure design, particularly the age and clearance characteristics of roads and structures within each state.
Width for trucks, on the other hand, is easy to standardize because highway lanes are built to a common dimension. So, 8 feet 6 inches is the standard for all 50 states.
Once trucked freight rises above the level of minimum legal requirements, permitting rules come into play. This is in fact where the majority of freight with oversize load dimensions falls.
Below superload thresholds, states often impose additional operating requirements based on the specific dimensions, which can vary widely. For instance, a state may require progressively more controls as width increases:
|
Width |
Typical Requirements |
|
Up to 10-12 feet |
Permit only |
|
12-14 feet |
Permit and possible escort |
|
14-16 feet |
Permit plus multiple escorts |
|
Near the superload threshold |
Additional restrictions apply |
Loads that exceed legal height often trigger route verification, clearance review, utility notification requirements, and restricted routes. Many states require carriers to certify that they have checked clearances before movement.
When length exceeds the legal limits, states will often call for front escort vehicles, rear escort vehicles or both, restricted turning routes, and limited travel times. States often have detailed tables dictating escort vehicle requirements that are tied to overall vehicle length.
As weight increases, states may require axle spacing analysis, bridge formula review, route approval and structural review. It varies by state, but many loads between 80,000 lbs and 150,000 lbs are routinely permitted without becoming superloads. For more detail on overweight requirements specifically, see our blog here.
Even when a load is well below superload thresholds, permits frequently include restrictions such as:
Many states prohibit movement during snow events, fog, heavy rain or high winds, particularly for wide loads.
Permits also will often specify the exact highways and interchanges to be traveled, bridge crossings, and approved travel directions. Most states require oversize load signs, warning flags, and amber warning lights once certain dimensions are exceeded.
For a standard permit below superload requiring little or no review, approval can happen immediately, in 15 minutes, or come the same day. Again, most states have a portal that automates the review and approval process.
A state permit requiring manual routing review can take one to three business days for approval, while a complex multi-state oversize/overweight freight shipment can take two to five business days.
Securing a permit for a superload becomes much more involved. For example, the permitting process can take from several days up to a month. Requirements can include engineering review, law enforcement escorts, a formal route survey and even written agreements with utility companies along the route.
Some states require a justification letter, an official document explaining why the load cannot be broken down, reduced, or shipped via alternative methods like rail or barge.
A comprehensive traffic control plan is often mandated in some states, especially when the truck will be crossing into opposing lanes, navigating major intersections, or when coordinating with local law enforcement escorts.
For illustration purposes, let’s look at an import route from Europe to the Chicagoland area through Port Elizabeth, New Jersey. For truck transport, that would mean traversing interstates through parts of New Jersey, Pennsylvania, Ohio, Indiana and finally Illinois.
In this case, each of those states has a width allowed for trucked freight without an oversize/overweight permit of 8.5 feet, and a tractor-trailer length of 53 feet. If your load needs to exceed those parameters, this chart shows you the oversize load dimensions allowed by permit in each state (below superloads). Once a load exceeds normal legal limits, a carrier must obtain a permit, and the maximum permitted size depends on the state, route, bridge capacities, road geometry, utility clearances, and other factors. This is why in several cases a range is given:
|
Oversize/Overweight Permit Limits by State (Standard Freight Loads) |
||||
|
State |
Max Width |
Max Height |
Max Length |
Max Weight |
|
New Jersey |
14-16 feet |
14-15 feet |
100-120 feet |
120,000-200,000+ lbs |
|
Pennsylvania |
16 feet |
14-15 feet |
100-120 feet |
120,000-200,000+ lbs |
|
Ohio |
16 feet |
14-15 feet |
120 feet |
120,000-225,000+ lbs |
|
Indiana |
16 feet |
15 feet |
110-160 feet |
120,000-200,000+ lbs |
|
Illinois |
16 feet |
14-15 feet |
120+ feet |
120,000-200,000+ lbs |
In this same scenario (Port Elizabeth to Chicago), the following describes how the permitting requirements escalate as the freight dimensions and/or weight increases:
At the base level, freight moving out of the Port of Elizabeth into the interstate system operates under standard legal vehicle dimensions as described earlier (up to 8 feet 6 inches wide, trailer lengths of 48-53 feet, height up to 14 feet 6 inches). Weight remains within standard federal axle and gross vehicle limits.
In this stage, vehicles operate freely on the interstate system, and there are no escort requirements or bridge-specific engineering reviews. This category includes typical container drayage and standard dry van freight entering I-95, I-78, and connecting interstate corridors toward Pennsylvania and beyond.
Routine oversize/overweight permitting typically begins with widths up to approximately 12 feet, height up to 14 feet, and lengths from 80-100 feet. Weight may increase into the 80,000 to 120,000 lb. range, depending on axle configuration.
Permits for oversize/overweight are required, but processing is often automated or issued the same day by state DOT systems. Escort requirements are limited; many shipments require no escort, though a single rear escort may be triggered based on width or route complexity.
Bridge review is generally limited to automated route screening rather than full engineering analysis. These loads move through the early portion of the corridor — often along I-78 through New Jersey into Pennsylvania’s Lehigh Valley region — before continuing west.
As shipments increase in complexity, typically reaching widths up to 14 feet, heights approaching or exceeding 14 feet, lengths in the 100-150-foot range, and weights between 120,000 and 200,000+ pounds, an enhanced oversize/overweight permit is required.
These shipments frequently require one or two escort vehicles, including front and rear pilot cars, and in some congested segments of the corridor, particularly urban or high-traffic areas, state police escorts may be added.
At this stage, bridge involvement increases significantly. Rather than automated checks, states conduct selective bridge-by-bridge analysis along the approved route, verifying load capacity and clearance constraints.
Permitting becomes a manual DOT review process and may require several days of coordination. These shipments commonly include industrial machinery, large fabrication units, and energy sector components moving through Pennsylvania, Ohio, and into Indiana.
At the highest level of complexity, shipments exceed routine oversize/overweight thresholds and enter superload status. These loads typically exceed 16 feet in width, involve extreme vertical clearance constraints, or lengths beyond 150 feet, often with multi-unit or specialized transport configurations. Weight frequently exceeds 200,000 to 300,000+ pounds, depending on cargo type.
At this stage, escort requirements become extensive. Movement may require multiple escort vehicles positioned front and rear, with state police escorts frequently assigned. In urban or constrained segments, rolling road closures or full traffic control operations may be implemented. Bridge review becomes fully engineered, involving bridge-by-bridge structural analysis and load path modeling across the entire route.
Permitting requires multi-agency coordination, often involving DOT engineering divisions, law enforcement, and utility companies where overhead clearance adjustments are necessary, such as wire lifts or signal relocation. Approval timelines extend from days to weeks depending on complexity.
These movements are typical for power generation equipment, transformers, turbines, and large industrial infrastructure components destined for Midwest industrial or energy installations near Chicago and surrounding logistics hubs such as Joliet and Elwood (which for some may conjure up images of “The Blues Brothers”).
Trucking companies are the ones ultimately responsible for obtaining the necessary permits, conducting route surveys, determining operating hours and securing escorts. That said, an established freight forwarder has a broad-based carrier network and can connect you with reliable providers who specialize in hauling freight with oversize load dimensions. This takes all the guesswork and vetting off your plate so you can concentrate on the transaction and shipment details.
Freight forwarder I.C.E. Transport, based near the Port of New York and New Jersey, has extensive knowledge in out-of-gauge cargo shipping (or OOG shipping) based on nearly 40 years’ experience and can advise you accurately about what will work and what won’t in a particular scenario.
“We work with multiple carriers that serve the same lanes, and deal with oversize freight pretty much on a weekly basis,” said I.C.E. Transport president Andrew Rozek. “We want the cargo to move safely and legally, but we also want that service to be as cost competitive as possible.”
To learn more about how we can set you up for success with your freight that falls into the oversize load dimensions category, contact I.C.E. Transport today.