1. What is the South Dakota DOT Bridge Weight Calculator?

Definition: This calculator determines the maximum allowable weight for vehicles crossing bridges in South Dakota based on axle configuration.

Purpose: It helps truck drivers and transportation professionals comply with South Dakota bridge weight regulations.

2. How Does the Calculator Work?

The calculator uses the South Dakota DOT formula:

Where:

• \( W \) — Maximum allowable weight (pounds)
• \( L \) — Distance between axles (feet)
• \( N \) — Number of axles (dimensionless)

Explanation: The formula calculates the safe weight limit based on axle spacing and count to prevent bridge damage.

3. Importance of Bridge Weight Calculation

Details: Proper weight calculation ensures bridge safety, prevents structural damage, and helps avoid regulatory violations.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: Why is the minimum number of axles 2?
A: The formula requires at least 2 axles to calculate weight distribution across a span.

Q2: How accurate is this calculation?
A: This provides the theoretical maximum according to SD DOT standards, but actual limits may vary by specific bridge.

Q3: Does this account for different axle configurations?
A: This is a general formula. Special configurations may require additional calculations.

Q4: What's the typical weight limit for common trucks?
A: A standard 5-axle semi with 40-foot wheelbase would have a limit of about 80,000 lbs.

Q5: Where can I find official SD DOT regulations?
A: Visit the South Dakota Department of Transportation website for official weight regulations.