Dispatching Around the 14-Hour Clock: How to Plan Loads That Actually Fit

Most hours-of-service guides are written for the driver. A dispatcher has a different job: deciding before the truck rolls whether a load fits the hours the driver has left, then knowing the exact time that plan stops working. Here's how to do both, with a worked example you can check with a calculator.

The limits you're planning around

For a property-carrying driver, four limits in 49 CFR 395.3 decide what fits. The rule binds the carrier as well as the driver: a motor carrier may not "permit or require" a driver to drive outside them.

Limit	In plain language	What it means for dispatch
14-hour window	No driving after 14 consecutive hours from coming on duty, following 10 consecutive hours off	Sets the latest time the truck can move today
11-hour driving	Up to 11 hours of driving inside that window	Sets how far the truck can go today
30-minute interruption	No driving once more than 8 hours of driving have passed without a 30-minute interruption	Goes into the schedule as a stop
60/70-hour limit	60 on-duty hours in 7 days, or 70 in 8 if the carrier runs every day of the week; a 34-hour off-duty period can restart the count	Decides whether tomorrow's load works

Why the window can run out before the driving hours

The 14 hours are consecutive, so they keep counting whether the wheels are turning or not. A driver who stops for lunch satisfies the 30-minute rule and still loses the half hour from the window. Time at the dock counts too: loading and unloading, and waiting to be dispatched unless the driver has been relieved from duty, are on-duty time under 49 CFR 395.2.

The driving clock only spends when the truck moves. The window spends all day.

Worked example: a 400-mile load and a slow shipper

These numbers are illustrative. The driver comes on duty at 6:00 am, so the window closes at 8:00 pm. There's a 15-minute pre-trip, a 1-hour drive to the shipper, 2 hours planned for loading, then 400 miles to the receiver. At a planning speed of 50 mph, that's 8 hours of driving, plus one 30-minute stop for fuel and food.

Line	As planned	Shipper runs 3 hours long
Window closes	8:00 pm	8:00 pm
Leaves shipper	9:15 am	12:15 pm
Time needed to reach receiver	8h 30m	8h 30m
Reaches receiver	5:45 pm	8:45 pm, too late
Driving hours used by the end	9h 00m	8h 15m at 8:00 pm
Driving hours still unused	2h 00m	2h 45m

In the second column, the driver has 2 hours 45 minutes of driving left and has to stop anyway, 45 minutes short of the receiver. That's about 38 miles at the planning speed. Looking at the 11-hour clock alone, this load looks fine.

Work out the last-leave time

The most useful number on the load is the latest time the truck can leave the shipper and still make it.

In the example, that's 8:00 pm − 8h 00m − 30m, which gives 11:30 am with no cushion. Add a 45-minute cushion and it's 10:45 am. Write that time on the load before the driver leaves the yard. If the truck is still at the dock at 10:45 am, the conversation with the receiver happens then, not at 7:30 pm.

The rule limits driving, not all work, so a driver can unload after the 14th hour. But that driver can't drive again until they've had the required time off. If there's no safe parking at or near the receiver, work back from the last parking spot instead of the dock.

What to check before you assign

1. Window left (shift time). Compare it with the whole job: driving, stops and every dock.
2. Driving time left. Compare it with planned driving only.
3. Break status. Know when the next 30-minute interruption falls and put it in the plan. On-duty time that isn't driving also counts, so a long enough dock stop can satisfy it.
4. Cycle hours left. A load that fits today can still strand the driver tomorrow. Check that the hours exist for the delivery day too.
5. Each dock's history. If a shipper has run long before, plan on what it actually takes, not the appointment time.

Read these from the ELD, not from memory.

When the shipper runs long

• Recalculate at the last-leave time. Don't wait for the driver to call in at the end of the shift.
• Move the appointment early. A reschedule request at noon is easier than an apology at 8:00 pm.
• Find the parking stop. If the load won't make it, pick where the driver stops for the 10 hours, while there's still time to reach it.
• Don't lean on the driver. 49 CFR 390.6 prohibits carriers, shippers, receivers and intermediaries from coercing a driver to operate in violation of the safety rules.

Exceptions that change the math

• Sleeper berth split. Under 49 CFR 395.1(g), two rest periods can add up to the required 10 hours, and qualifying periods don't count against the 14-hour window. One must be at least 7 consecutive hours in the berth, neither can be under 2 hours, and they must total at least 10.
• Adverse driving conditions. 395.1(b)(1) can allow up to 2 extra hours for weather or unusual road or traffic conditions that couldn't reasonably have been known before dispatch. A forecast you already had doesn't qualify, and a slow dock isn't on the list.
• 16-hour short-haul. 395.1(o) lets a driver who returns to the normal reporting location go up to 16 hours, with limits on how often and other conditions.
• The "pause" isn't available to plan around. FMCSA's Split Duty Period pilot would test pausing the window, but it's a limited pilot, with full launch planned for 2027 (trade coverage).

What ReadyTMS does, and where it stops

• Samsara or Motive fleets: the ELD page shows each driver's drive, shift and cycle time left, once your ELD connection has access to hours-of-service data. That table is what you read before assigning.
• Peak ELD fleets: ReadyTMS warns when an on-duty driver has 30 minutes or less on the driving or 14-hour clock, or when a driver behind the wheel has 15 minutes or less before a break is due. A background check about every 30 minutes can text the driver and alert dispatch when those services are connected. Peak's own portal is still where you read the full clocks.
• After the fact, for Peak fleets: the HOS Audit in Safety rebuilds each driver's day from clock snapshots and flags likely 11-hour, 14-hour, break and cycle problems. It doesn't replace your ELD records.

ReadyTMS does not check hours when you assign a load, and it doesn't work out a last-leave time for you. That comparison is still yours. A warning at 30 minutes left is a backstop, not a plan, which is why the math above matters.

ReadyTMS also handles rate confirmations, billing and settlements for $149/month flat. See what a carrier TMS should do.

Related reading

• Dispatch software for owner-operators
• Carrier TMS: what it should do
• How to choose TMS software for a small fleet

Frequently Asked Questions

Does a 30-minute break stop the 14-hour clock?

No. The 14 hours are consecutive, so a break satisfies the 30-minute rule but the window keeps running. The main exception is a qualifying sleeper berth split under 49 CFR 395.1(g).

Can a driver unload after the 14th hour?

49 CFR 395.3(a)(2) says a driver may not drive after the 14-hour period. It limits driving, not all work, so unloading can happen, but that driver then can't drive again until they've taken the required off-duty time. Plan for parking at or near the receiver.

Does shipper detention count as adverse driving conditions?

A long wait at a dock is not listed. The definition in 49 CFR 395.2 covers adverse weather and unusual road or traffic conditions that were not known, or could not reasonably be known, before the driver started or was dispatched.

Can drivers pause the 14-hour clock now?

Not under the general rule. FMCSA is preparing a Split Duty Period pilot that would test a pause, with full launch of its pilot programs planned for 2027. It is a limited test, so plan loads on the current rule.