Trucking and Logistics

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Dimensional Weight (DIM) - DIM and billable weight from L*W*H and carrier divisor.
Freight Density and NMFC Class - Density (lb/ft^3) and NMFTA density-class bracket from handling unit.
Pallet Cube and Trailer Loadout - Pallets per trailer by floor area and weight, cube fill, cube-out vs weigh-out.
Hours of Service Math - FMCSA 49 CFR 395 drive time, 14-hour window, 70/8 cap, and 30-min break.
Federal Bridge Formula and Axle Weights - Per-axle, tandem, and bridge-formula limits from axle weights and spacings.
Bridge Formula Minimum Axle Spread - The Federal Bridge Formula solved for the minimum outer-to-outer axle spread that legally carries a target group weight.
Reefer Fuel Burn and Run Time - Estimated run time and fuel burned from manufacturer GPH benchmarks.
Incoterms 2020 Decoder - Plain-English summary of who pays freight, who carries risk, and who clears customs.
Stopping Sight Distance (AASHTO) - AASHTO Green Book SSD = perception-reaction + braking distance from speed, friction, and grade.
Cargo Securement Working-Load-Limit Check - Aggregate WLL vs. the half-cargo-weight requirement, pass/fail, and the minimum tiedown count for the article length.
IFTA Per-Jurisdiction Fuel Tax - Taxable gallons (miles / fleet MPG), net tax due or credit for a jurisdiction, and consumption vs. tax paid at the pump.
Operating Cost Per Mile - Fixed, fuel, maintenance, and driver cost per mile plus the total and break-even rate per mile from monthly fixed costs.
Deadhead Percentage and Effective Rate - Deadhead percentage, rate per loaded mile, rate per total mile.
Axle-Load Tandem Slide - Over/under per axle group, weight shift per slider hole (lever-arm), holes to slide and direction.
Truck Startable Grade (Traction Limit) - The steepest grade a truck can START on, limited by drive-axle traction, not engine power.
Dynamic Hydroplaning Speed - The speed at which a tire rides up on a water film and loses road contact.
Minimum Tiedown Count and Aggregate WLL - The minimum number of tiedowns a piece of cargo needs and the aggregate working load limit it needs.
Kingpin-to-Rear-Axle Compliance and Tandem Slide - Whether a trailer's kingpin-to-rear-axle measurement complies with the governing state limit.
Safe Downgrade Descent Speed and Brake Load - The speed at which an engine brake alone holds a loaded truck on a grade.
Air Brake Pushrod Stroke and Out-of-Service Screen - Whether a measured pushrod stroke is inside its chamber's readjustment limit.
Oversize and Overweight Permit Threshold Screen - Four comparisons against the limits for a specific route.
HazMat Placarding Threshold Screen - Whether a load has to be placarded, from the two thresholds that govern it.
Idle Fuel Burn, Cost, and Engine-Hour Equivalent - What idling costs a truck and a fleet in fuel, and what it costs again in engine wear.
Flatbed Tarp Coverage, Count, and Weight - How wide a tarp a flatbed load needs, how many tarps cover its length, and what they weigh.
Trailer Deck Point Load and Dunnage Spread - Whether a concentrated load spread on dunnage stays inside a trailer deck's rating.
Static Rollover Threshold - The static rollover threshold (static stability factor).
Detention Billing and Opportunity Cost - What a shipper owes for holding your truck, and what the delay actually cost you.
Driver Pay: Cents-per-Mile vs Percentage - Which pays a driver more on this load, cents per mile or a percentage of the linehaul.
Invoice Factoring Cost and Effective APR - What factoring an invoice costs, what lands in the account today, and the rate that works out to.
Trailer Tongue Weight and Sway Check - The tongue-weight percentage that decides whether a trailer tows straight or fishtails.
Diesel Exhaust Fluid (DEF) Consumption and Range - Why a DEF tank spans several fuel fills, and never runs it dry.
Per-Load Net Profit - Net profit and profit per loaded mile for one specific load.
Fuel Surcharge per Mile - Fuel surcharge per mile and per load by the standard pegged-base method.
Maintenance Reserve per Mile - The cents per mile to set aside for tires, routine PM.
Gross Combination Weight Check - Whether a tractor-trailer is within its weight limits.
Tire Load-Rating Check (per Axle) - Whether an axle is within its tire load rating.
Max Design Speed from Sight Distance - The fastest safe design speed given the available sight distance.
Low-Speed Off-Tracking (Swept Path) - How far a turning truck's rear axle tracks inside the front axle's path.
Swept-Path Width (Turn Lane Occupancy) - The total roadway width a turning vehicle covers, the number a turn lane or intersection is sized on.
Railcar Load Limit, Route Limit, and Cube - The car's stencil gives light weight and load limit, and their sum is the gross rail load the car is built for.
Locomotive Tonnage Rating on a Ruling Grade - Twenty pounds per ton per percent of grade is the number to carry.
Train Air Brake Reduction and Cylinder Pressure - A freight brake pipe is charged to a regulated pressure, commonly 90 psi, and the brakes apply when that pressure DROPS.
Railcar Curve Swing and Clearance Envelope - A long rigid car on a curve is a chord across an arc.

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