Active & Completed Trips Management
| Trip # | Start Date | End Date | Driver Name | Vehicle | Status | Actions |
|---|---|---|---|---|---|---|
Multi-State Heavy Haul Planner
Mapbox OS/OW clearance routing, statutory fee schedules, and escort logic.
1. Route Corridor & Highway Class
2. Cargo, Commodity & Configuration Specs (All Required for Permit Import)
3. Route Calculations & Operating Metrics
Required State Permits (Every State Driven Through)
Axle Weight Distribution Report
Calculated legal and overweight axle distribution breakdown for .
Axle Group Distribution Analysis
| Group # | Axle Type / Position | Assigned Axles | Calculated Weight | Statutory Legal Limit | Compliance Status |
|---|---|---|---|---|---|
Legal Weight Distribution Calculation Methodology
Calculating legal weight distribution for oversize/overweight (OSOW) loads across axles involves evaluating federal and state weight laws combined with structural bridge formulas (such as the Federal Bridge Gross Weight Formula).
Before factoring in overweight distribution, baseline legal maximums per axle group must be established (typically under federal standards or state regulations like 23 CFR Part 658):
- Single Axle: Generally capped at 20,000 lbs.
- Tandem Axle Group (two axles spaced 40 inches to 96 inches apart): Generally capped at 34,000 lbs.
- Tridem Axle Group (three consecutive axles): Regulated based on spacing and tire width, typically ranging between 42,000 to 50,000+ lbs.
- Gross Vehicle Weight (GVW): Federal interstate limit is 80,000 lbs unless an overweight permit is issued.
To determine whether an axle group can legally carry a concentrated overweight load, the Federal Bridge Formula is applied to any group of 2 or more consecutive axles:
Where W = overall gross weight on any group of two or more consecutive axles to the nearest 500 pounds, L = distance in feet between the extreme extremes, and N = number of axles in the group.
When distributing heavy cargo across a multi-axle trailer (such as a 7-axle, 9-axle, or specialized 13-axle heavy-haul configuration):
- Center of Gravity (CG) Calculation: Engineers and dispatchers calculate the longitudinal center of gravity of the cargo relative to the trailer deck. Placing the load too far forward overloads the steer and drive axles of the tractor; placing it too far back overloads the rear trunnion or booster axles.
- Axle Weight Transfer Formula: Using moments (torque balance around the pivot points/kingpin), the exact weight supported by each axle group is calculated using static equilibrium equations ($\sum \text{Moments} = 0$). By multiplying the load weight by its distance from the pivot point and dividing by the wheelbase spacing between axle groups, you find the exact weight transferred to each set of tires.
When total weight exceeds legal caps, state DOT permit engineering teams review the axle weight breakdown to ensure no single axle group exceeds manufacturer tire ratings (e.g., pounds-per-inch of tire width) and that structural highway or bridge limits are not breached.
Route Obstacle & Avoidance Form
Audited hazards, construction zones, low clearances, and avoidance strategies along your corridor.
Driver Navigation & Active Route
Driver view optimized for live GPS tracking and turn-by-turn guidance.
Turn-by-Turn Instructions (Auto-tracks GPS)
Live Permit Vault
Pilot Car Service Directory
Live directory access to over 369+ verified escort companies across 48 states.
Oversize / Overweight Load Permits & Federal Regulations
Official guidelines, bridge formulas, federal thresholds, and active corridor state contacts.
Federal Weight Limits (23 CFR Part 658.17)
The following are the federally mandated maximum weights for the National System of Interstate and Defense Highways and reasonable access thereto:
- 80,000 pounds gross vehicle weight
- 20,000 pound single axle weight
- 34,000 pound tandem axle weight
Axle spacing is another consideration that must be taken into account when looking at Federal weight compliance. To protect bridges, the number and spacing of axles carrying the vehicle load must be calculated. Thus, a bridge weight formula is also applied to commercial vehicles in determining their compliance with Federal weight limits. The Federal bridge formula applies when the gross weight on two or more consecutive axles exceeds the limitations of the formula, except that two consecutive sets of tandem axles may carry a gross load of 34,000 pounds each if the overall distance between the first and last axle is 36 feet or more.
Where W = overall gross weight on any group of 2 or more consecutive axles to the nearest 500 pounds, L = distance in feet between the extreme of any group of 2 or more consecutive axles, and N = number of axles in the group under consideration.