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What are the primary changes of the Hours of Service regulations in this final rule?

A. Restart limited to once per week

The rule limits the use of the “34-hour restart” to once a week (168 hours).

(1) What is the purpose of the 168-hour provision?

The purpose of the rule change is to limit work to no more than 70 hours a week on average. Working long daily and weekly hours on a continuing basis is associated with chronic fatigue, a high risk of crashes, and a number of serious chronic health conditions in drivers.

(2) What is wrong with taking two 34-hour restarts in a week?

Multiple restarts in each week would not generally be a problem because frequent 34-hour-long off-duty periods would leave little time in a given week to build up excessive duty hours. If, however, restarts are taken every 6 days, a problem does arise: under existing rules, alternating 14 hours on-duty and 10 hours off, a driver would reach 70 hours in less than 5 full days. After a 34-hour break, the driver could then begin this same cycle again, totaling 70 hours on-duty every 6 calendar days, for an average of almost 82 hours per calendar week. Limiting restarts to one every 168 hours prevents this excessive buildup of on-duty hours, while still allowing drivers to use the restart provision to their advantage and avoiding the complexity of special provisions for more frequent restarts.

(3) Why doesn’t a 34-hour restart provide the driver enough rest?

A driver using the minimum restart every 5 or 6 days could average 80 or more hours a week. To do this, a driver would have to be working close to 14 hours a day. If a driver did this week after week, he or she would be chronically fatigued – two nights of sleep would only mitigate, not eliminate the slept debt the driver built up during the work week. That sleep debt would increase over time.

(4) Which drivers are most likely to be affected by the 168-hour provision?

Drivers who work very long hours (more than 70 per week) on a continuing basis are most likely to be affected by the 168-hour provision. The available data indicate that a small percentage of truckload drivers work these extreme hours.

(5) Will the provision limit drivers’ incomes?

The rule will limit income for those drivers who currently are able to drive more than 70 hours a week on a continuing basis. Almost all of the drivers affected by the provision are long-haul truckload drivers who are paid by the mile. The provision reduces possible driving hours less than total duty time.


(6) How will inspectors be able to enforce the provision during roadside inspections?

FMCSA recognizes that this provision will not always be enforceable during roadside inspections. FMCSA and our State partners will be able to verify compliance with this provision during compliance reviews or other interventions.

B. Restart must include 2 night periods between 1:00-5:00 a.m.

The restart must cover at least 34 consecutive hours and include at least two periods between 1:00 a.m. and 5:00 a.m., not two periods between midnight and 6:00 a.m. as proposed in the NPRM. Although both alternatives cover most estimates of when the “window of circadian low” occurs, the 4-hour (rather than 6-hour) period addresses concerns drivers raised in the comment period by giving drivers greater flexibility in ending and beginning the restart.

(1) Who will be affected by the 2-night provision?

Only drivers who drive nights and work more than 60 or 70 hours in a week will be impacted. The nighttime operations of the major less-than-truckload (LTL) carriers should be minimally impacted, as their drivers generally receive 2 days off duty a week. Drivers who will be impacted by this provision work heavy and irregular schedules that include some nighttime driving.

(2) What is the minimum length of time a driver has to be off duty to get the 2 night periods?

The minimum period is 34 hours. Most drivers driving day-time schedules will be able to obtain the 2 nights in a minimum 34-hour restart, if they need to use the restart at all. For example, a driver who begins a restart period when going off duty at 7:00 pm on a Friday would complete the minimum 34 hours off duty at 5:00 a.m. on Sunday. This would have included the required 2 nights off between 1:00 a.m. and 5:00 a.m. Only drivers who have a regular overnight driving schedule and who work more than 5 nights a week will need to take longer restarts to obtain the 2 nights off.

(3) If a driver works 10 hours a night 6 nights a week and takes the 7th night off, does he then have to take an extra night off?

No, the driver would be working 60 hours in 7 days and would not need a restart to start working again on the 8th day. The driver, therefore, would not need to use the restart provision.

*(4) Won’t the 2-night provision cause night drivers to change to day time driving and add more trucks to the road during the day?

The FMCSA knows of no reason why drivers would stop driving at night to avoid the extra hours that may be needed to meet the 2-night requirement. Most drivers who regularly drive overnight do not work enough hours to need a restart and, therefore are not subject to the 2-night requirement.

(5) Won’t the 2-night requirement make drivers “flip” their sleep schedule on their days off?

It is likely that night drivers already stay awake during at least part of the daytime when taking a restart, particularly at home; otherwise they would have minimal time to spend with their (day-oriented) families. Because daytime sleep is shorter and of lower quality, switching to night sleep helps at least to attenuate the sleep debt a driver working maximum hours builds up. Research consistently indicates that it is difficult to get more than 4 to 6 hours of sleep during the day; sleeping during the day on days off, therefore, simply increases the driver’s sleep debt.

(6) Are the two nighttime periods based on the driver’s terminal time or local time, when different?

Drivers’ logs are based on the time zone of their home terminal. The 2-night periods are, therefore, set by the time at the home terminal. They are not related to “local time.”

(7) Will the 2-night provision end nighttime deliveries?

No. Most drivers who routinely drive at night are either LTL line-haul operators or work for local private carriers making deliveries (such as grocery and restaurant suppliers). Neither of these is likely to switch to day driving nor is there any reason why they would need to. Most of these drivers work few enough hours per week (less than 60) that they can maintain their preferred schedule while still complying with the HOS rule. In particular, if they are not driving more than 60 or 70 hours, they are not affected by the changes to the restart. Long-haul truckload drivers may prefer to drive at night, but their schedules are irregular and determined by their appointment times. Even these drivers, according to ATA, do not routinely work enough hours to trigger the need for the restart. When they do work maximum hours, they can still drive at night 5 nights a week.

(8) Isn’t the 2-night requirement based solely on one lab-based study?

To study the effectiveness of the 2-night restart provision, FMCSA tested in a controlled sleep lab environment. This is done under the premise that if a provision is not effective in the lab, it certainly will not be effective in a field-related environment. That is, if people cannot obtain adequate sleep in the best-case environment (a dark, quiet room, with no possibility of interruption), they will not be able to obtain adequate sleep in a normal environment, let alone in a sleeper berth at a truck stop or beside a road. The study found that the 2-night provision works better than 1-night to mitigate driver fatigue in nighttime drivers. The findings of the study could be conservative, i.e., they could understate the adverse effect of night work on performance. In the study, the subjects did not work more than half of the full 14-hour work period and had 58 hours off between weeks. The impact on drivers who are working twice as much and attempting to start work again in a shorter period is likely to be more severe than the study indicated.

C. No driving if more than 8 hours since last break of 30 or more minutes

The final rule requires that if more than 8 consecutive hours on duty have passed since the last off-duty (or sleeper-berth) period of at least half an hour, a driver must take an off-duty or sleeper berth break of at least 30 minutes before driving. To address an issue raised by commenters, FMCSA has also added an exception for drivers of commercial motor vehicles (CMVs) carrying Division 1.1, 1.2, or 1.3 explosives to allow them to count on-duty time spent attending the CMV, but doing no other on-duty work, toward the break.

(1) Why is FMCSA requiring drivers to take breaks?

Recent research found that any break from driving reduces risk in the hour following the break, but off-duty breaks produced the largest reduction. This study also showed that when non-driving activities (both work- and rest-related) were introduced during the driver’s shift—creating a break from the driving task—these breaks significantly reduced the risk of being involved in a safety critical event during the 1-hour window after the break. The benefits of breaks from driving ranged from a 30- to 50-percent reduction in risk with the greatest benefit occurring for off-duty (non-working) breaks.

(2) Do I have to take a break exactly 8 hours after I come on duty?

No, the rule gives drivers flexibility in when and where to take the break. The rule only prohibits driving if more than 8 consecutive hours have passed since the last off-duty period of at least 30 minutes. For example, if a driver spends 2 hours loading at the beginning of the day, then has a 10-hour drive ahead, he or she must take the break no later than 8 hours after coming on duty. The driver can, however, take the break earlier. If he or she takes a half-hour or more break at some point between the 4th and 8th hours after coming on duty, the driver can complete the rest of the planned 10 hours of driving without another break.

(3) Does the break have to be spent resting?

No. The driver must be off duty for at least a half hour. Meal breaks or any other off-duty time of at least 30 minutes qualifies as a break. Drivers carrying certain explosives, who are required to attend the vehicle at all times, are allowed to count attendance time, which is on duty, toward the break if they do no other work during that time.

(4) Can the shorter sleeper-berth break (minimum 2 hours) be used to meet the half-hour break requirement?

Yes. Any off-duty or sleeper-berth period of 30 minutes or more will meet the requirement.

(5) Does the break count against the 14-hour driving window?

Yes. Allowing off-duty time to extend the work day would allow drivers to drive long past the time when fatigue becomes extreme. The 14-consecutive-hour rule was adopted to prevent that and to help drivers maintain a schedule that is consistent with circadian rhythms.

(6) Which drivers are most likely to be affected by this provision?

Commenters to the proposed rule stated that most drivers already take breaks, so they are unlikely to be affected. The only drivers who will be affected are those who drive after working for more than 8 hours without taking any off-duty time.

(7) Can time spent waiting to be loaded or unloaded count toward the break requirement?

Time spent waiting to be loaded or unloaded is on duty unless the driver has been released from all responsibility for the truck. Except for drivers attending loads of certain explosives, on-duty time cannot be considered as a break.


*(8) Are drivers using the “100 air-mile radius” or “non-CDL 150 air-mile radius” provisions in § 395.1(e) required to take the minimum 30-minute break if applicable?

Yes. Drivers operating under the 395.1(e) exceptions may not drive if more than 8 consecutive hours have passed since the last off-duty period of at least 30 minutes. Because they are not required to maintain records of duty status (“logbooks”), they are not required to record the break periods.

Last Updated : March 16, 2014