1. What is the ND Bridge Formula?

The North Dakota Bridge Formula calculates the maximum allowable weight that can be carried on a group of axles based on the number of axles and their spacing. It helps prevent damage to road infrastructure.

2. How Does the Calculator Work?

The calculator uses the ND Bridge Formula:

Where:

• \( W \) — Maximum allowable weight in pounds
• \( L \) — Distance in feet between the outer axles
• \( N \) — Number of axles in the group

Explanation: The formula accounts for both the number of axles and their spacing to determine safe weight limits.

3. Importance of Weight Calculation

Details: Proper weight distribution is crucial for road safety, bridge protection, and compliance with North Dakota transportation regulations.

4. Using the Calculator

Tips: Enter the number of axles (2-10) and the spacing between outer axles in feet. All values must be valid (axles ≥ 2, spacing > 0).

5. Frequently Asked Questions (FAQ)

Q1: What's the minimum number of axles?
A: The formula requires at least 2 axles to calculate weight distribution.

Q2: Does this apply to all vehicles?
A: Yes, this applies to all commercial vehicles operating in North Dakota.

Q3: Are there different formulas for different states?
A: Yes, some states have variations of the bridge formula with different constants.

Q4: What about single axle limits?
A: North Dakota also has single axle (20,000 lbs) and tandem axle (34,000 lbs) limits.

Q5: Are permits available for overweight loads?
A: Yes, North Dakota offers special permits for overweight/oversize loads with restrictions.