Can this driver legally make this load?
Use fresh ELD clocks to screen planned driving against the remaining driving allowance and planned elapsed/on-duty work against the window and cycle limits. Include deadhead, service time and required breaks, and leave final HOS eligibility with the driver and safety team because this screen does not model every exception or split-sleeper rule.
- 11-hour limit
- Maximum driving after 10 consecutive hours off duty.
- 14-hour window
- Driving must end by the 14th hour after coming on duty.
- 60/70-hour cycle
- On-duty limit over 7 or 8 consecutive days.
- 30-minute break
- Generally required before further driving after 8 cumulative driving hours without a qualifying 30-minute interruption; exceptions apply.
Pre-dispatch HOS feasibility screen
-- Illustrative conservative planning screen. SQL Server 2022+. Read only.
-- Enter a reviewed route plan; NULL inputs must not produce a pass.
DECLARE @OrderId int = 123456;
DECLARE @RequiredDriveMin int = NULL; -- Loaded plus deadhead driving.
DECLARE @ServiceMin int = NULL; -- On-duty non-driving work.
DECLARE @BreakMin int = NULL; -- Planned qualifying interruption.
DECLARE @MaxClockAgeMin int = 5; -- Example freshness policy.
SELECT d.DriverId, c.ClockAsOfUtc,
CASE WHEN @RequiredDriveMin IS NULL OR @ServiceMin IS NULL
OR @BreakMin IS NULL OR @RequiredDriveMin < 0
OR @ServiceMin < 0 OR @BreakMin < 0
OR c.RemainingDriveMin IS NULL OR c.RemainingWindowMin IS NULL
OR c.RemainingCycleMin IS NULL OR c.DriveUntilBreakMin IS NULL
OR c.ClockAsOfUtc IS NULL
OR c.ClockAsOfUtc > SYSUTCDATETIME()
OR c.ClockAsOfUtc < DATEADD(minute,-@MaxClockAgeMin,SYSUTCDATETIME())
THEN 'Review missing, invalid or stale inputs'
WHEN @RequiredDriveMin > c.DriveUntilBreakMin
THEN 'Review break timing and remaining driving segments'
WHEN @RequiredDriveMin <= c.RemainingDriveMin
AND @RequiredDriveMin + @ServiceMin + @BreakMin <= c.RemainingWindowMin
AND @RequiredDriveMin + @ServiceMin + @BreakMin <= c.RemainingCycleMin
THEN 'Within basic planning limits; safety review still required'
ELSE 'Review route, assignment or relay plan' END AS Screen
FROM reporting.AvailableDriver AS d
LEFT JOIN reporting.EldClock AS c ON c.DriverId = d.DriverId
WHERE EXISTS (SELECT 1 FROM reporting.Orders WHERE OrderId = @OrderId);
-- Break minutes count against the cycle here conservatively; actual duty status matters.
-- This intentionally sends trips spanning a break to review rather than modeling it.Illustrative artifact: adapt the table names, keys, date boundaries and business rules to your installed system. No customer results are claimed.
The source ELD must expose one current clock record per driver. This is a planning filter, not legal clearance, and does not apply exceptions or predict clock recapture; see FMCSA HOS summary.
The Mathematical Challenge of Modern Fleet Dispatch
Dispatching an over-the-road (OTR) or regional fleet is one of the most computationally complex operations in business. Every minute, a dispatcher must evaluate hundreds of variable constraints:
- Hours of Service (HOS) rules: 11-hour driving limits, 14-hour duty windows, 70-hour/8-day caps, and complex split-sleeper berth resets.
- Physical equipment specs: Tractor fifth-wheel slide positions, trailer cube/weight capacities, reefer temperature zones, and Hazmat endorsements.
- Time-sensitive windows: Strict shipper pickup cutoffs, receiver strict appointment times, and port rail ramp demurrage clocks.
- Driver retention factors: Requested home time, preferred lanes, layover avoidance, and equitable mileage distribution.
Human dispatchers handle these equations using experience and intuition. When freight volumes spike or severe weather disrupts a corridor, cognitive overload leads to sub-optimal load assignments, unnecessary deadhead miles, and costly driver frustration.
How Strong Tower Consulting Advises on Predictive Dispatch
We help carriers design and evaluate algorithmic decision-support architectures that relieve dispatcher burden without stripping them of operational control.
1. Mathematical Constraint Formulation
We work with your operations leaders to translate messy operational rules into precise mathematical formulas. We establish hard constraints (non-negotiable safety and legal rules that models can never violate) and soft constraints (weighted preferences such as minimizing empty miles, favoring senior drivers, or hitting maintenance milestones).
2. Real-Time Telematics & ELD Pipeline Architecture
An algorithm is only as good as the telemetry feeding it. We audit and architect high-frequency data pipelines connecting Samsara, Motive, Geotab, or Omnitracs ELD platforms into your dispatch environment, ensuring duty status, remaining drive time, and GPS coordinates are refreshed continuously without overloading API rate limits.
3. Decoupled Microservice Integration
One of the biggest risks of legacy dispatch automation is database locking. If an external optimization solver queries your core TMS database tables directly during morning dispatch rush, the entire system can freeze. We architect decoupled read-replica data pipelines that feed constraint solvers and deliver ranked recommendation cards directly to dispatch screens safely.
4. Independent Commercial Vendor Due Diligence
If you are considering commercial dispatch optimization software, we serve as your technical advocate. We test vendor algorithms against your historical dispatch history to verify whether their claimed fuel savings and deadhead reductions hold up against your real-world lane topography.
Assess Your Fleet's Dispatch Optimization Potential
Schedule an architectural consultation to evaluate whether your current TMS data and telematics infrastructure can support predictive dispatch modeling.