How to Ship Heavy Equipment Across State Lines: Permits, Rules & What to Expect

Why Multi-State Permitting Is Complex

The United States has federal legal limits for commercial vehicles — 80,000 lbs GVW, 8.5 ft width, 13.5 ft height, 65 ft length — but each state sets its own oversize/overweight permit requirements, fees, travel restrictions, and routing rules for loads that exceed these limits. A load that requires one permit in Missouri may require three separate permits in California, each with different conditions.

There is no single national oversize permit. Every state your load passes through requires its own permit, and each state's permit must be obtained before the load enters that state. This is why multi-state heavy-haul transport requires careful advance planning.

What Triggers a Permit Requirement?

Any load that exceeds federal legal limits requires a permit in every state it crosses. The four key dimensions to check:

Dimension	Federal Legal Limit	Common Permit Trigger
Width	8.5 ft	Over 8.5 ft in all states; pilot car typically required over 14 ft
Height	13.5 ft (federal guideline)	Varies by state: 13.5–14.5 ft; route survey may be required over 15 ft
Gross Vehicle Weight	80,000 lbs	Over 80,000 lbs in all states; superload review over 200,000 lbs
Length	65 ft (truck + trailer)	Over 65 ft in most states; varies by state and trailer type

Note that height limits vary by state. Some states (Oregon, Colorado) allow 14–14.5 ft without a permit; others (many Eastern states) enforce 13.5 ft strictly. Your carrier must know the height limit for every state on the route.

How Multi-State Permits Are Obtained

Your carrier's permit department handles multi-state permit procurement. The process typically works as follows:

1. Load dimensions confirmed: The carrier verifies the equipment's exact dimensions and weight in transport position
2. Route planned: The carrier selects a route that avoids low bridges, weight-restricted roads, and other obstacles
3. Permits applied for: Separate permit applications are submitted to each state's DOT, either online or through a permit service
4. Permits issued: Each state issues its permit with specific conditions (travel hours, pilot car requirements, routing restrictions)
5. Load moves: The driver carries all permits and complies with each state's conditions as the load crosses state lines

Processing time varies by state: some issue permits within hours online; others take 2–5 business days. California, New York, and a few other states have the most complex requirements and longest processing times.

State-by-State Variation: Key Differences to Know

Travel Hours

Most states restrict oversize load movement to daylight hours, Monday through Saturday. Some states prohibit oversize movement on Sundays and holidays. A few states allow night moves with special authorization. Your carrier must comply with the most restrictive state's rules for each segment of the route.

Pilot Car Requirements

Pilot car (escort vehicle) requirements vary by state and load dimensions:

• Most states require a front pilot car for loads over 14 ft wide
• Many states require a rear pilot car for loads over a certain length (typically 100–120 ft)
• Some states require pilot cars for loads over 14 ft tall
• Pilot cars must be equipped with specific warning signs, lights, and flags per state requirements

Routing Restrictions

States may restrict oversize loads to specific routes, prohibit travel on certain roads or bridges, or require alternate routing around urban areas. California, in particular, has detailed routing requirements for oversize loads in the Bay Area and Los Angeles metro. Your carrier's permit department handles routing compliance.

Spring Weight Restrictions

Many states impose reduced weight limits on secondary roads during spring thaw (typically February–April). These restrictions protect road surfaces from damage when the ground is saturated. Interstate highways are generally exempt, but if your route includes secondary roads, your carrier must verify current restrictions.

What Shippers Should Do

• Provide accurate dimensions early: Give your carrier the equipment's exact dimensions and weight in transport position as soon as possible. Inaccurate dimensions can invalidate permits and create legal liability.
• Plan for permit processing time: Allow 2–5 business days for standard multi-state permits; longer for complex loads or states with slow processing (California, New York).
• Don't assume your carrier knows the dimensions: Even if you've shipped the same equipment before, verify dimensions each time — attachments, modifications, or different trailer configurations can change the numbers.
• Ask about superload requirements: Loads over 200,000 lbs or with extreme dimensions may require engineering review and special routing — plan weeks in advance.

IronHaul Logistics handles multi-state permit coordination for heavy equipment shipments nationwide. Our permit team manages the entire process — from route planning to permit procurement to compliance monitoring — so you don't have to. Call (208) 495-2260, email [email protected], or use our online quote form to get started.