OSOW Permits Explained: Oversize/Overweight Permit Guide for 2025

OSOW permits are the legal authorization required to transport cargo exceeding standard highway size and weight limits. Understanding the permit process is crucial for anyone shipping oversize or overweight freight.

What Does OSOW Mean?

OSOW stands for Oversize/Overweight, referring to loads that exceed legal limits for:

• Width: Over 8.5 feet (102 inches)
• Height: Over 13.5-14 feet (varies by state)
• Length: Over 48-53 feet (varies by trailer type)
• Weight: Over 80,000 pounds gross vehicle weight

Any shipment exceeding these dimensions requires OSOW permits from each state it travels through.

Types of OSOW Permits

Different permit types serve various shipping needs:

Single Trip Permits

Best for: One-time or occasional oversize shipments

Single trip permits authorize one specific move from origin to destination along a designated route. They typically:

• Specify exact pickup and delivery addresses
• Define the route the load must travel
• Include travel time restrictions
• Expire after a set period (usually 5-10 days)

Cost: $15-$100 per state (varies by dimensions)

Annual Permits

Best for: Frequent shippers of similar-sized loads

Annual permits cover multiple trips within a year, usually with dimension limitations:

• Allow unlimited trips within permit parameters
• Typically limited to lower oversize thresholds
• More cost-effective for regular shippers
• May require quarterly reporting

Cost: $200-$1,000+ per state annually

Multi-State Permits

Some regional agreements allow single permits covering multiple states:

• Western States Agreement: Covers western US states
• WASHTO: Western Association of State Highway Transportation Officials
• Limited to certain dimension ranges

Superload Permits

Best for: Extremely heavy or wide loads

Superloads exceed standard oversize thresholds and require additional planning:

• Typically loads over 16’ wide, 16’ tall, 150’ long, or 200,000+ lbs
• Require bridge analysis studies
• May need route surveys
• Often require police escorts
• Longer processing times (1-4 weeks)

OSOW Permit Requirements

To obtain permits, you’ll typically need to provide:

Vehicle Information

• Truck make, model, and year
• Number of axles
• Axle spacing measurements
• Registration and insurance

Load Information

• Cargo description
• Total weight (including truck and trailer)
• Overall dimensions (length, width, height)
• Axle weight distribution

Route Information

• Origin address (city, state, specific location)
• Destination address
• Preferred route (if any)
• Requested travel dates

Documentation

• Certificate of Insurance (COI)
• Valid MC/DOT numbers
• Driver’s license information

Permit Processing Times

Processing varies by state and load complexity:

Permit Type	Typical Processing
Standard oversize	24-48 hours
Multiple states	2-5 business days
Superloads	1-4 weeks
Emergency/expedited	Same day (additional fees)

Pro Tip: Plan permit acquisition 2+ weeks ahead for superloads to avoid delays.

OSOW Permit Costs

Permit fees vary significantly by state and load characteristics:

Fee Structures

Flat fees: Some states charge fixed rates regardless of dimensions

Tiered fees: Costs increase with load size:

• Over-width: $20-$75 per state
• Over-height: $20-$50 per state
• Over-length: $20-$50 per state
• Overweight: $50-$500+ per state (based on weight)

Weight-mile fees: Some states charge per pound per mile

Additional Costs

• Bridge analysis: $200-$2,000+ per bridge
• Route surveys: $500-$3,000+
• Utility coordination: Varies by relocation needs
• Police escorts: $50-$150 per hour
• Expedite fees: 50-100% surcharge

Sample Multi-State Permit Budget

Example: 14’ wide, 15’ tall, 120,000 lb load from Texas to Ohio

State	Permit Fee
Texas	$75
Oklahoma	$45
Kansas	$50
Missouri	$35
Illinois	$50
Indiana	$45
Ohio	$40
Total	$340

Actual fees vary; this is illustrative only.

State Permit Restrictions

Beyond permits, states impose operational restrictions:

Travel Time Restrictions

Most states limit oversize travel to:

• Daylight hours: 30 minutes before sunrise to 30 minutes after sunset
• Weekdays: Many states prohibit weekend travel
• Non-holiday: Major holidays typically prohibited

Route Restrictions

• Certain highways prohibited for superloads
• Bridge weight restrictions may force alternate routes
• Urban areas often require off-peak travel

Weather Restrictions

Permits may be suspended during:

• Rain or wet roads
• Snow or ice conditions
• High winds (especially for tall/wide loads)
• Poor visibility

How Everdauer Handles OSOW Permits

Our in-house permit team manages the entire process:

1. Load Analysis

We review your cargo specifications to determine:

• Permit classifications by state
• Route options and restrictions
• Escort requirements
• Special considerations (bridges, utilities)

2. Route Engineering

Our routing specialists:

• Identify optimal paths
• Verify clearances and weight limits
• Plan around restrictions
• Coordinate utility relocations if needed

3. Permit Procurement

We obtain all required permits:

• State DOT oversize/overweight permits
• Local permits where required
• Superload authorizations
• Bridge analysis approvals

4. Documentation Package

You receive:

• All permits for the route
• Approved route maps
• Travel time windows
• Special instructions

5. Compliance Support

Throughout transport:

• Permit modifications if needed
• Extension requests
• Real-time compliance monitoring

Common OSOW Permit Mistakes to Avoid

1. Inaccurate Dimensions

Underestimating load size can result in:

• Permit violations and fines
• Route problems (won’t fit)
• Permit revocation

Solution: Measure everything, including load accessories.

2. Last-Minute Requests

Rushing permits leads to:

• Higher expedite fees
• Limited route options
• Potential delays

Solution: Start permit process 2+ weeks ahead.

3. Ignoring Weather Forecasts

Permits may be suspended during inclement weather.

Solution: Build weather contingency into schedules.

4. Missing Documentation

Incomplete applications delay processing.

Solution: Prepare all vehicle and load documentation before applying.

5. Route Deviations

Traveling off the permitted route violates permit terms.

Solution: Follow approved routes exactly; contact permit office if changes needed.

Get Your OSOW Permits with Everdauer

Stop worrying about permit complexities. Everdauer Heavy Haul provides:

• Complete permit services across all 50 states
• Expert route planning optimizing time and cost
• Transparent pricing with all fees disclosed upfront
• Permit tracking and compliance documentation
• 24/7 support for permit-related issues

Request your free quote today:

• Call: (414) 600-3636
• Online: Get a Quote

Let us handle the paperwork while you focus on your project.

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Permit requirements and fees change frequently. Contact Everdauer for current information specific to your shipment.