1. What is the Bridge Law Formula?

The Bridge Law formula calculates the maximum legal weight for vehicles based on axle configuration and distance between axles. It's used to determine safe weight limits that won't damage bridge structures.

2. How Does the Calculator Work?

The calculator uses the Bridge Law equation:

Where:

• \( W \) — Maximum legal weight (lbs)
• \( L \) — Distance between first and last axle (feet)
• \( N \) — Number of axles

Explanation: The formula accounts for how weight is distributed across multiple axles and the distance between them to determine safe bridge crossing weights.

3. Importance of Bridge Law Calculations

Details: Proper weight calculations are crucial for preventing bridge damage, ensuring public safety, and complying with transportation regulations.

4. Using the Calculator

Tips: Enter the distance between first and last axle in feet, and the number of axles (minimum 2). All values must be valid positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Why is the Bridge Law important?
A: It helps prevent excessive stress on bridge structures that could lead to damage or collapse.

Q2: How does axle spacing affect weight limits?
A: Longer spacing between axles allows for higher total weight as the load is distributed over a greater area.

Q3: What's the minimum number of axles allowed?
A: The formula requires at least 2 axles (N ≥ 2) as it's impossible to have a vehicle with less than 2 axles.

Q4: Are there different bridge laws in different states?
A: Yes, some states may have variations of this formula or additional regulations.

Q5: How often should weight calculations be checked?
A: Whenever vehicle configuration changes or when planning routes with weight-restricted bridges.