Strong Tower Consulting, LLC is the Minnesota freight technology consulting firm founded by Scott Elliott in 2008. Dispatch software has to apply the split sleeper berth the same way a compliant ELD does: two rest periods, a paired total of at least 10 hours, and a recalculation that starts at the end of the first qualifying period. Use the model below to compare a planned pair with that structure before you assign the next load.
Planning aid for property-carrying drivers. Confirm the current text of 49 CFR 395.1(g) and your ELD provider's calculation before dispatching. Not legal advice.
Period 1 is the earlier rest. The 7-hour sleeper can be either period. 8/2 and 7/3 fill sample durations. Custom fills a 7.5 and 2.5 pair. Any pair that meets the rule qualifies.
Period 1
Between the periods
Period 2
After the pair
How the model works
The tool applies the same steps every time you change an input. It uses only the times and hours you enter.
- Check the two rest periods. Both need a start and an end, the end must come after the start, the periods cannot overlap, and Period 1 must be the earlier rest.
- Test the pair. One period must be at least 7 hours in the sleeper berth. The other must be at least 2 hours. Together they must total at least 10 hours.
- Set the anchor. When the pair qualifies, the recalculation starts at the end of Period 1.
- Recalculate driving. Available driving is 11 hours minus the driving between the periods, minus any driving after Period 2, never below 0. A cycle balance you enter caps the result.
- Recalculate the window. The 14-hour window ends at the anchor plus 14 hours plus the length of Period 2. Hours left are counted from the end of Period 2.
- Name the binding limit. The smallest of driving left, window left, and cycle hours left is the earliest binding limit.
qualifies = (one sleeper period >= 7 h) and (other period >= 2 h) and (P1 + P2 >= 10 h)
anchor = end of Period 1
drive_left = max(0, 11 - drive_between - drive_after), capped by cycle hours left
window_end = anchor + 14 h + (P2 end - P2 start)
window_left = max(0, window_end - P2 end)
binding = min(drive_left, window_left, cycle_left)
Confirm the result on the ELD before you dispatch.
How solvers model a split sleeper pair
A solver does not treat 8/2 as one rule and 7/3 as another. It tests three conditions. One period is at least 7 consecutive hours in the sleeper berth. The other period is at least 2 consecutive hours off duty, in the sleeper berth, or a combination. The two durations add up to at least 10 hours. Either period may come first, so 7.5 hours in the sleeper berth plus 2.5 hours off duty is the same kind of pair as a preset.
Neither qualifying period counts against the 14-hour window. When the pair is complete, the 11-hour driving limit and the 14-hour window are recalculated from the end of the first qualifying period. That anchor is the end of Period 1, the earlier rest. Driving between the end of Period 1 and the start of Period 2 is subtracted from 11. Driving entered after Period 2 is subtracted too. The window end is the anchor plus 14 hours plus the length of Period 2, because the second rest does not consume the window. A qualifying period of at least 2 hours satisfies the 30-minute break. The 60/7 or 70/8 cycle is not extended, so hours remaining on the cycle cap the driving result when you enter them.
Illustrative example. This matches the default 8/2 preset. A property-carrying driver comes on duty at 06:00. Period 1 is sleeper berth from 14:00 to 22:00 (8 hours). The driver then drives from 22:00 to 03:00 (5 hours). Period 2 is off duty from 03:00 to 05:00 (2 hours). On-duty not driving in the gap is 0 hours, driving after Period 2 is 0 hours, and no cycle balance is entered. The pair qualifies. The 7+ sleeper is Period 1. The anchor is 22:00. The window end is 22:00 + 14 hours + 2 hours = 14:00 the next day. Drive left is 11 - 5 = 6 hours. From the end of Period 2 at 05:00, 9 hours remain in the window. The earliest binding limit is driving. On the default dates the tool shows: Qualifies. Period 1 duration 8 hours (Sleeper berth). Period 2 duration 2 hours (Off duty). 7+ sleeper period Period 1. Recalculation anchor Thu Oct 22, 2026, 10:00 PM (22:00). Available driving hours remaining 6 hours. 14-hour window end Fri Oct 23, 2026, 2:00 PM (14:00). Hours left in the window 9 hours. Earliest binding limit driving (6 hours).
Why ELD as-of timestamps matter
The anchor is a timestamp, not a rounded duty label. If the sleeper period ends at 22:04 and the next rest starts at 03:00, the gap is that elapsed interval. A one-minute difference can put a sleeper block under 7 hours or move the window end. Read the sleeper begin, sleeper end, and the second rest from the ELD as-of those events, then enter those values here. This page does not replace the ELD calculation, and it does not change the regulatory text.
Common dispatcher mistakes
Two mistakes show up often when a board is compared with the ELD.
The first is treating the 2-hour period as a reset. A 2-hour off-duty block does not, by itself, start a new 11-hour driving limit or a new 14-hour window. It qualifies only as the companion to a sleeper period of at least 7 hours, and only when the two periods total at least 10 hours. Driving between the two periods still counts against the 11 hours that remain after the anchor.
The second is forgetting the cycle cap. A split does not extend the 60/7 or 70/8 cycle. A driver with 4 hours left on the cycle cannot use a 6-hour driving result from the split math. Enter the cycle balance and read the earliest binding limit: driving, window, or cycle.
Frequently asked questions
What two rest periods make a valid property-carrying split sleeper pair?
One period of at least 7 consecutive hours in the sleeper berth, and another period of at least 2 consecutive hours off duty, in the sleeper berth, or a combination. Together they must total at least 10 hours. Either period may come first. An 8/2 pair and a 7/3 pair are presets, and any other pair that meets the same tests qualifies, including 7.5 hours and 2.5 hours.
Do the qualifying rest periods count against the 14-hour window?
No. Neither qualifying period counts against the 14-hour window. Driving and on-duty not driving between the periods still count, because that time is not one of the two excluded rests.
When are the 11-hour driving limit and the 14-hour window recalculated?
When the pair is complete, both are recalculated from the end of the first qualifying period. Available driving is 11 hours minus the driving between the end of period 1 and the start of period 2, minus any driving after period 2. The 14-hour window ends at the end of period 1 plus 14 hours plus the length of period 2.
Does a split sleeper pair extend the 60/7 or 70/8 cycle?
No. A split does not extend the 60/7 or 70/8 cycle. If you enter hours remaining on the cycle, available driving is capped by that balance.
Does a qualifying 2-hour period satisfy the 30-minute break?
Yes. A qualifying period of at least 2 hours satisfies the 30-minute break. The tool still shows a warning if you enter more than 8 hours of driving without a 30-minute interruption between the end of period 1 and now.
Review this result with an advisor
The message starts with the current inputs and result. Add your name and work email if you want an advisor to compare the model with your ELD export.
Make dispatch software apply the split the way the ELD does.
Strong Tower Consulting provides independent systems architecture, feasibility audits, and engineering roadmaps for motor carriers and freight brokers. Contact our advisory team or call 763-244-1373 to discuss your operational data and evaluate practical implementation paths for your fleet.