Can I drive after the 14-hour window closes if I still have hours left?

No. The 14-hour on-duty window is a hard cutoff for driving regardless of how many of the 11 driving hours you have used. A driver who has used only 4 driving hours but has been on duty for 14 consecutive hours cannot drive again until they take a qualifying rest break.

Does my 30-minute break have to be off duty?

The break must be spent in the sleeper berth, off duty, or as a combination of both. You cannot satisfy the break requirement by switching to on-duty not-driving status — fueling, inspecting, or doing paperwork does not count. The break must be genuine non-driving, non-on-duty time.

What happens to my 70-hour clock if I park the truck for the weekend?

Your 70-hour clock does not reset on its own over a weekend. Hours continue to count for 8 rolling days. To reset the clock, you need a 34-hour restart — 34 consecutive hours completely off duty.

If I split my sleeper berth time, does my 14-hour window pause?

Yes. When the sleeper berth provision is used correctly, the paired rest periods together count as a 10-hour break and the 14-hour window is paused during the qualifying sleeper berth period. One period must be at least 7 consecutive hours in the sleeper berth and the other at least 2 consecutive hours.

Do hours-of-service rules apply to all truck drivers?

Federal HOS rules apply to commercial motor vehicle drivers engaged in interstate commerce who operate vehicles meeting certain size or weight thresholds. There are exceptions including the short-haul exception, the adverse driving conditions exception, and the agricultural exemption. Drivers operating solely within a single state may face different state-specific requirements.

Guide

Hours of service rules explained

The hours-of-service (HOS) rules are FMCSA regulations that limit how long a commercial driver can drive and work before resting. For a driver operating under the standard property-carrying rules, the limits work together in three layers: a daily driving cap, a daily on-duty window, and a weekly accumulated hours limit. Understanding how all three interact — and where the exceptions apply — is the foundation of compliant trip planning.

This guide summarizes FMCSA hours-of-service rules for property-carrying drivers under the standard rule set as of the guide's publication. Rules change. Always verify current requirements at fmcsa.dot.gov or with a qualified compliance resource before making operating decisions based on this guide.

The three core limits

1. The 11-hour driving limit

After coming off a qualifying 10-hour off-duty period, a driver may drive up to 11 hours total. Driving time means time in motion — not time parked at a shipper, waiting at a weigh station, or sitting in traffic with the engine off. When the 11 hours of driving are used up, the driver must stop driving until they complete another 10 consecutive hours off duty.

The 11-hour limit resets with each qualifying off-duty period. It does not roll over — unused driving hours from one day do not carry to the next.

2. The 14-hour on-duty window

After coming off a qualifying 10-hour off-duty period, a driver has a 14-consecutive-hour window in which all driving and on-duty work must be completed. The 14-hour clock starts when the driver first comes on duty — typically when they begin the pre-trip inspection, check in at a shipper, or start the truck. It does not stop for breaks, waiting time, or non-driving activities. Once 14 hours have elapsed from the start of the on-duty period, the driver cannot drive again until completing a new 10-hour off-duty period.

This is the limit that surprises many new drivers. A driver who spends 5 hours on duty at the shipper before getting on the road has only 9 hours of 14-hour window remaining — regardless of whether they have used any of their 11 driving hours. Shipper delays, detention, and unexpected waiting all eat into the 14-hour window without generating revenue.

3. The 70-hour limit in 8 days

A driver operating for a carrier that operates vehicles 7 days a week may not drive after accumulating 70 on-duty hours in any 8-consecutive-day period. (Carriers that do not operate every day of the week may use a 60-hour/7-day limit instead.) Once a driver reaches the 70-hour limit, they must stop driving until enough hours have "fallen off" the rolling 8-day window, or until they take a 34-hour restart.

The 70-hour rule is a rolling calculation — not a calendar week. On any given day, the relevant question is: what is the total on-duty time across the last 8 consecutive days? If that total is at or near 70 hours, the driver's available time is limited accordingly.

The 30-minute break requirement

A driver must take a 30-minute break before driving after 8 consecutive hours on duty without a break of at least 30 minutes. The break can be satisfied by off-duty time, on-duty not driving time (waiting at a facility), or sleeper berth time. For most drivers, this means stopping somewhere between hour 8 and hour 11 of the driving day if they have been continuously working.

The short-haul exception (see below) eliminates the 30-minute break requirement for drivers who qualify.

The 34-hour restart

A driver who has run low on 70-hour clock can "restart" the 8-day cycle by taking at least 34 consecutive hours off duty. After a 34-hour restart, the driver's 70-hour clock resets to zero and a fresh 8-day window begins. The restart allows drivers who have used most of their weekly hours to get back to a full week of available hours quickly rather than waiting for the rolling window to gradually free up capacity.

For carriers with dedicated routes and predictable schedules, a weekend restart is a common planning tool. For irregular over-the-road routes, restart timing depends on delivery commitments and reload availability.

The sleeper berth provision

Drivers operating trucks with a qualifying sleeper berth may split their off-duty time into two periods under the sleeper berth provision. The split must consist of two periods that together total at least 10 hours, where one period is at least 7 consecutive hours in the sleeper and the other is at least 2 consecutive hours (either off duty or in the sleeper). Neither period counts against the 14-hour window — they pause it. The 11-hour driving limit is proportionally adjusted based on how the split is taken.

The sleeper berth provision is the most complex part of the HOS rules. Team drivers and drivers on long-haul routes use it regularly. Single-driver operators on regional routes often find the basic 10-hour off-duty reset simpler to manage. Understanding both options allows a driver to choose the approach that fits their route and rest needs.

The short-haul exception

Drivers who meet specific short-haul conditions may qualify for a simplified rule set that eliminates the need for an ELD and removes the 30-minute break requirement. To qualify under the standard short-haul exception, a driver must:

Report to and return to the same location within a 14-hour window
Stay within a 150 air-mile radius of the reporting location
Not use the short-haul exception on more than 8 days within a 30-day period

Drivers who qualify as short-haul still must comply with the 11-hour driving limit and the 70/60-hour weekly limit, but they do not need an ELD and do not need to take the 30-minute break.

Adverse driving conditions exception

If a driver encounters unexpected adverse driving conditions — snow, ice, fog, traffic delays from an accident — after beginning a trip, they may extend the 11-hour driving limit and the 14-hour window each by 2 hours. The conditions must be genuinely unexpected: a driver cannot invoke this exception for weather that was forecast when the trip began. The extension is documented on the driver's records of duty status.

How ELDs connect to HOS

Most commercial drivers subject to HOS rules must use an electronic logging device (ELD) to record their duty status automatically. The ELD syncs with the truck's engine and captures driving time without requiring manual entry. However, an ELD records what happens — it does not manage hours for the driver. A driver who relies on an ELD to "tell them when to stop" without understanding the underlying rules can still receive violations if they do not understand what the device is tracking.

When a driver is stopped at a roadside inspection, the officer can download or view ELD records and compare them against the driver's actual trip. Discrepancies between ELD data, the driver's personal log, and fuel or GPS records are a common source of violations.

Common HOS planning mistakes

Starting the clock wrong: The 14-hour window begins at first on-duty activity, not when the truck starts moving. A driver who begins a pre-trip inspection at 6:00 a.m. has a 14-hour window that closes at 8:00 p.m., whether or not they left the yard by 7:00 a.m.
Not accounting for shipper delays: Two hours of unexpected detention at pickup compresses both the 14-hour window and the available driving time without adding any paid miles. Trip planning needs to account for realistic shipper and receiver times, not best-case scenarios.
Misunderstanding the 34-hour restart: The restart requires 34 consecutive hours off duty. Partial rest periods that do not reach 34 consecutive hours do not reset the 70-hour clock.
Ignoring the break requirement until it is a problem: A driver approaching hour 8 of on-duty time without a 30-minute break cannot continue driving. Planning the break before hour 8 rather than discovering the requirement mid-route is basic trip management.
Treating HOS violations as minor: HOS violations result in out-of-service orders, fines, and CSA score impacts. A pattern of violations affects the carrier's safety rating and the driver's employment history.

Where to find the official rules

The FMCSA publishes the current hours-of-service rules at fmcsa.dot.gov, including guidance documents, summaries, and frequently asked questions. The regulatory text is in 49 CFR Part 395. When in doubt about how a specific situation applies, the official FMCSA resource is the authoritative source — not CB radio, not a load board forum, and not this guide.

Common questions about hours of service

Can I drive after the 14-hour window closes if I still have hours left?: No. The 14-hour on-duty window is a hard cutoff for driving regardless of how many of the 11 driving hours you have used. A driver who has used only 4 driving hours but has been on duty for 14 consecutive hours cannot drive again until they take a qualifying rest break. This is one of the most common HOS misconceptions.
Does my 30-minute break have to be off duty?: The break must be spent in the sleeper berth, off duty, or as a combination of both. You cannot satisfy the break requirement by switching from driving to on-duty not-driving status — fueling, inspecting, or doing paperwork while the truck is stopped does not count. The break must be genuine non-driving, non-on-duty time.
What happens to my 70-hour clock if I park the truck for the weekend?: Your 70-hour clock does not reset on its own over a weekend. Hours continue to count for 8 rolling days. To reset the clock, you need a 34-hour restart — 34 consecutive hours completely off duty. A Saturday and Sunday spent off duty is only about 48 hours if you start Friday night, so it may qualify if the timing works out — but verify against your specific on-duty and off-duty timestamps, not just the calendar days.
If I split my sleeper berth time, does my 14-hour window pause?: Yes — when the sleeper berth provision is used correctly, the paired rest periods together count as a 10-hour break and the 14-hour window is paused (not extended) during the qualifying sleeper berth period. The math is specific: one period must be at least 7 consecutive hours in the sleeper berth, the other must be at least 2 consecutive hours, and neither period counts against the 14-hour window. The combination allows a driver to extend a run over a longer calendar period than a single 11-and-10 split would allow.
Do hours-of-service rules apply to all truck drivers?: Federal HOS rules apply to commercial motor vehicle drivers engaged in interstate commerce who operate vehicles meeting certain size or weight thresholds. There are exceptions — the short-haul exception, the adverse driving conditions exception, and the agricultural exemption, among others. Drivers operating solely within a single state under that state's own rules may face different requirements. If you are unsure whether federal HOS rules apply to your operation, verify with the FMCSA or a compliance resource.