TruckDisp Load Planning and Optimization Flashcards

A flatbed load is 42 feet long, 8.5 feet wide, and weighs 44,500 lbs. The shipper wants to add a 1,200-lb accessory crate at the rear. What is the primary regulatory concern before accepting the additional freight?

Answer: The combined load will exceed the 80,000 lb federal gross vehicle weight limit depending on axle configuration

The current payload is 44,500 lbs. Adding 1,200 lbs brings the freight weight to 45,700 lbs. Combined with a typical tractor-trailer tare weight of ~33,000–35,000 lbs, the gross could approach or exceed the 80,000 lb federal limit. Axle weight distribution and the specific truck's tare weight must be verified before acceptance — this is the controlling concern. The 8.5-foot width is legal without a permit in all states; 46,000 lb is the tandem axle limit, not single; and 48–53 ft trailers handle 42 ft loads routinely.

A dispatcher is building a multi-stop truckload route: Stop 1 (Chicago, 18,000 lbs), Stop 2 (Indianapolis, 12,000 lbs), Stop 3 (Louisville, 8,000 lbs). The driver has a 70-hour/8-day recap opportunity available on day 4. Which load sequencing strategy best protects on-time delivery while legally maximizing hours?

Answer: Schedule Stop 1 and Stop 2 deliveries before day 4, then leverage the recap hours for the Stop 3 leg where the driver would otherwise be short

A 70-hour/8-day recap does not reset the clock like a 34-hour restart — it simply drops hours from 8 days ago back into the available pool. The strategic use is to preserve it for the leg where the driver will be short on hours. Completing Stops 1 and 2 first consumes hours early in the cycle; by day 4, older hours drop off via recap, restoring availability for the final Louisville leg. A 34-hour restart is a full reset but costs 34 hours of idle time — inefficient here. Descending-weight sequencing is a loading concern, not an HOS strategy.

A hazmat shipment of UN1993 (Flammable Liquid, N.O.S.) is being dispatched in a non-bulk container at 450 lbs. The shipper provides a bill of lading listing only 'Flammable Liquid.' What is the dispatcher's obligation before dispatching the driver?

Answer: The dispatcher must ensure the BOL includes the proper shipping name, hazard class, UN number, packing group, and emergency response information before the driver departs

Under 49 CFR Part 172, a hazmat shipping paper must include the proper shipping name (Flammable Liquid, N.O.S. is insufficient without the technical name in parentheses), hazard class (3), UN identification number (UN1993), packing group, total quantity, and emergency response information. The dispatcher shares compliance responsibility and must not dispatch a driver with an incomplete or non-compliant BOL. The 500 lb exemption applies to placarding on vehicles, not to shipping paper requirements. No FMCSA pre-authorization is required for this classification. Dispatchers have affirmative DOT compliance duties.

A dry van load picks up Monday at 06:00 and must deliver 1,847 miles away by Wednesday at 14:00. The driver started a fresh 70-hour cycle Monday at 00:00. Assuming optimal conditions and no delays, what is the binding constraint that a dispatcher must plan around?

Answer: The distance requires approximately 28 hours of drive time; split across two days with mandatory 10-hour rest periods, the load is feasible but has under 4 hours of buffer before the delivery deadline

At an average of 65 mph, 1,847 miles requires roughly 28.4 drive hours. HOS allows 11 hours of driving per day. Day 1 (Monday): driver can drive up to 11 hours (roughly 715 miles), then must take a 10-hour break. Day 2 (Tuesday): another 11 hours (~715 miles, total ~1,430). Day 3 (Wednesday): remaining ~417 miles at 65 mph ≈ 6.4 hours, arriving around 06:30 Wednesday if the Day 3 drive starts at 00:00 — well before the 14:00 deadline. Total buffer ≈ 7.5 hours, though real-world conditions compress this. The 14-hour rule applies to the on-duty window, not a mileage cap; there is no 660 mile/day rule. Bridge law affects routing only in unusual cases, not this scenario.

A dispatcher receives two load offers for the same available truck: Load A pays $2,850 for 1,240 miles (Chicago to Dallas); Load B pays $1,980 for 680 miles (Chicago to Nashville). The truck's all-in operating cost is $1.65/mile. After Nashville, a $2,400 load back to Chicago (420 miles) is pre-confirmed. After Dallas, the broker market for comparable return freight averages $1.20/mile with typical deadhead of 180 miles. Which load produces higher net revenue for the carrier over the full cycle?

Answer: Load B + confirmed return, because the confirmed Nashville-to-Chicago backhaul eliminates repositioning risk and the combined cycle nets $640 more than the Dallas cycle

Load A cycle: Revenue $2,850. Return: 180 mi deadhead + ~500 mi average backhaul at $1.20/mi = $600 return revenue, 680 total miles at $1.65 = $1,122 cost. Net A cycle ≈ $2,850 + $600 − (1,240 + 680) × $1.65 = $3,450 − $3,168 = $282 net. Load B cycle: Revenue $1,980 + $2,400 = $4,380. Total miles = 680 + 420 = 1,100 at $1.65 = $1,815 cost. Net B cycle ≈ $4,380 − $1,815 = $2,565 net. Load B cycle nets ~$2,283 more. The confirmed backhaul eliminates repositioning risk and produces far superior economics. Higher gross revenue per single load is not the right optimization metric — full cycle net is.

A driver is 40 minutes from the receiver at 15:20 when the dispatcher learns the receiving dock closes at 16:00 and the appointment was 14:00. The driver was delayed by a 2-hour DOT inspection (documented). The carrier's contract includes a $250/hour detention fee after 2 free hours, but is silent on late-delivery liability. What is the dispatcher's best immediate action?

Answer: Contact the receiver immediately to confirm they will accept the late arrival, document the DOT inspection delay, and notify the shipper/broker of the delay status and force-majeure basis

When a documented government inspection causes delay, the carrier has a strong force-majeure defense, but this does not happen automatically — it must be communicated and documented proactively. The dispatcher's first obligation is to call the receiver to secure late acceptance (avoiding a refusal and reschedule costs), then notify the broker/shipper in writing, preserving the inspection paperwork as evidence. Speeding without communication risks a refusal if the dock has closed or staff has left. There is no DOT reimbursement mechanism for carrier delays caused by inspections. Rebooking immediately without attempting late acceptance is unnecessarily costly and operationally damaging.