Who this is for: CDL drivers, fleet managers, owner-operators
34-Hour Restart for CDL Drivers — How It Works
The 34-hour restart allows property-carrying CMV drivers to reset their 60/70-hour weekly on-duty cycle by taking at least 34 consecutive hours off duty. After a valid restart, the driver's available on-duty hours reset to the full 60 or 70-hour cap. The restart is optional — drivers may also wait for old on-duty hours to age out of the rolling window.
What the 34-hour restart does
Under 49 CFR 395.3(c), a driver may restart a new 7- or 8-day cycle (and reset their accumulated on-duty hours to zero) after taking at least 34 consecutive hours off duty. This "restarts" the rolling window — after the 34-hour off-duty period is complete, the driver's 60 or 70-hour cycle begins fresh with no accumulated hours. The restart allows drivers who have accumulated significant on-duty hours to regain full weekly capacity more quickly than waiting for hours to age off the rolling window.
When the restart is and is not required
The 34-hour restart is optional, not required. Drivers are not required to take a restart to comply with HOS rules — they can instead manage their rolling window by waiting for old on-duty hours to drop off. However, if a driver has exhausted their 60 or 70-hour limit and needs to resume operations quickly, the restart is the fastest way to restore full weekly capacity. Drivers who are approaching the limit and have an opportunity for an extended home time break may choose to take the restart voluntarily.
How to count the 34 hours
The 34-hour off-duty requirement must be consecutive — no on-duty time of any kind may occur during the 34 hours. Time in the sleeper berth counts as off-duty for this purpose. The 34 hours must be a single uninterrupted period. Once the 34 hours are complete, the driver's ELD (or RODS) reflects a fresh cycle start. The restart begins the moment the driver comes on duty after the 34-hour period.
Historical note on restart restrictions
The 34-hour restart has had various restrictions and modifications over the years, including a period when two 1:00–5:00 AM off-duty periods were required within the 34 hours. As of the current regulatory framework, the 34-hour restart requires only 34 consecutive hours off duty with no additional time-of-day requirements. Check the current version of 49 CFR 395.3(c) for the applicable requirements, as these rules have been revised multiple times.
Restart vs. waiting — how to decide which makes more sense
Whether to use a restart or simply wait for rolling window hours to age off depends on how much time you have and how many hours remain in your cycle. If you're 3–4 hours below the cap and can resume driving in two days without a restart, waiting is more efficient. If you've exhausted your limit on Friday and need to be fully available Monday morning, a restart beginning Friday evening completes 34 hours by Sunday evening and gives you a fresh cycle. Owner-operators who get home on weekends often take the restart naturally without planning it. The key is knowing where you are in the rolling window before deciding — an ELD makes this visible; paper RODS drivers should calculate it manually each morning.
Frequently Asked Questions
Does taking a 34-hour restart affect the driver's daily 11/14-hour limits?
No. The restart resets the 60/70-hour weekly cycle only. The daily 11-hour driving limit and 14-hour on-duty window reset after 10 consecutive hours off duty, independent of the 34-hour restart. A driver who takes a 34-hour restart will also have a fresh 10-hour off-duty period embedded in those 34 hours, so both daily and weekly limits are reset when they return to duty.
Can a driver take a partial restart — say, 30 hours off — and get partial credit?
No. The restart is all-or-nothing. Only 34 full consecutive off-duty hours provide a complete cycle reset. There is no partial restart credit. However, drivers may still benefit from off-duty time of any duration because on-duty hours from the oldest day in the rolling window drop off naturally as days pass.
What happens if a driver never takes a 34-hour restart and just keeps working within the rolling window?
That is entirely legal. The 34-hour restart under §395.3(c) is optional — drivers are never required to use it. A driver who manages their hours within the rolling 60/70-hour window can continue operating indefinitely without a restart, as long as they stay below the cap and comply with the daily 11-hour and 14-hour limits. The restart is only useful when the driver has exhausted their cycle and needs a full reset quickly.
During a 34-hour restart, can the driver perform any on-duty work — maintenance, paperwork, safety training?
No. Any on-duty activity during the 34-hour period breaks the restart. The 34 consecutive hours must be entirely off-duty or sleeper berth time with no work of any kind. If even 15 minutes of on-duty activity occurs, the restart clock resets to zero and must restart from that moment to achieve a valid 34-hour reset.