Hours of Service Rules Explained
Answers to FAQs on HOS
Before a truck ever leaves the yard, a driver’s clock is already ticking. Hours of service regulations shape how long drivers can be on the road, when they need to take breaks, and how fleets plan routes, maintenance and deliveries.
Traffic, weather delays, and unscheduled maintenance can all disrupt drivers’ schedules and affect their productivity, but what exactly are hours of service rules, and why are they so important?
Understanding these regulations is essential not only for staying compliant, but also for improving safety, reducing risk and keeping operations running smoothly. A clear view of hours of service can help fleets make smarter decisions, minimize downtime and better support drivers on the road.
Hours of Service FAQs
What are Hours of Service Rules?
Hours of Service regulations, often called HOS, are federal rules that limit the maximum time drivers can be on duty, including the time they spend driving, before they must rest. The regulations, established by the Federal Motor Carrier Safety Administration and applicable to most commercial motor vehicle drivers engaged in interstate commerce, were designed to reduce fatigue-related accidents and improve safety.
HOS Rules at a Glance
Key aspects of the regulations include:
| An 11-Hour Driving Limit | Drivers may operate a vehicle for up to 11 hours after 10 consecutive hours off duty. Once drivers have driven for 11 hours, they must take another 10 consecutive hours off before they can drive again. |
| A 14-Hour Work Window | In addition to a limit of 11 hours of driving time, drivers have a 14-hour on-duty window. Once the 14-hour clock starts, it runs continuously until the driver goes off duty for 10 consecutive hours. The 14-hour window does not stop for breaks, meals, fuel stops, maintenance issues, or loading and unloading time. That means non-driving on-duty activities, such as pre-trip inspections, waiting at a shipper or filling out paperwork, count against the 14-hour limit. Drivers cannot drive beyond the 14th consecutive hour after coming on duty. |
| 30-Minute Break Requirements | Drivers have to take a break of at least 30 minutes after driving for eight hours. |
| A 60/70-Hour Limit | In addition to daily limits, drivers have weekly limits on driving time. Drivers may not drive after 60 hours on duty in seven days, or 70 hours in eight days. Which rule applies depends on whether the fleet operates vehicles every day of the week. |
| A 34-Hour Restart | Drivers can reset their weekly limits by taking 34 consecutive hours off duty. |
Who Do HOS Rules Apply To?
They apply to commercial motor vehicles with a gross vehicle weight rating of 10,0001 pounds or more and are typically tracked using Electronic Logging Devices, or ELDs, that automatically record driving time.
Do HOS Rules Apply to Rental Trucks?
Yes, the rules apply to rental trucks that meet the commercial vehicle weight and use requirements. The Penske Driver™ mobile app helps drivers track HOS while in a Penske rental vehicle.
Are There Exemptions to the Rules?
Yes. Several HOS exemptions exist for specific industries, operations and conditions. Fleets and drivers should always check for the latest exemptions from federal and state agencies.
HOS exemptions explained:
| Short-Haul Operations | Drivers operating within a 150 air-mile radius of home base, returning each day, may use a 14-hour on-duty window extended to apply within a 16-hour window two days per week, and are exempt from the 30-minute break and ELD requirements. |
| Agricultural | Drivers transporting agricultural commodities during planting and harvesting seasons within a 150 air-mile radius of the source are exempt from HOS requirements. |
| Adverse Driving Conditions | Drivers who encounter unexpected adverse driving conditions, such as severe weather, may be able to extend their 11-hour driving limit and 14-hour window by up to two hours. |
| Emergency Declarations | The FMCSA may issue HOS waivers during national or regional emergencies. For example, the agency waived HOS rules during the COVID-19 pandemic. |
What Happens if a Driver Violates HOS Rules?
HOS violations can result in significant consequences for both drivers and carriers, including drivers being placed out of service and financial penalties for carriers. The FMCSA can also flag carriers with poor HOS compliance records through the Safety Measurement System (SMS), which can affect carrier scores, customer relationships and insurance rates.
How Do Equipment and Maintenance Support HOS Compliance?
Operating late-model, well-maintained equipment reduces the risk of over-the-road failures and unscheduled downtime, so vehicles and drivers keep operating as scheduled, protecting drivers' hours. Penske Truck Leasing's Dynamic PM is a unique, data-driven preventive maintenance service that analyzes specifications and trends specific to each fleet to deliver the right preventive maintenance at the right time, helping prevent issues before they start.
Penske also taps into remote diagnostics to monitor and triage potential issues based on live fault-code data. By drawing on experience and advanced analytics, Penske's maintenance teams can determine which alerts need immediate attention and which can wait, avoiding unnecessary delays. If an issue does occur on the road, Penske offers 24/7 roadside assistance to help minimize downtime and get equipment and drivers moving again quickly. Penske also offers replacement vehicles, if needed.
How Can Data Help Maximize Driving Hours?
Penske’s CatalystAI™ can help fleets take a more proactive, data-driven approach to their overall operations. While CatalystAI does not track behavior or compliance, it analyzes large volumes of fleet data to help fleets identify inefficiencies, such as extended dwell times, and predict maintenance issues and pinpoint underutilized equipment.
CatalystAI also provides a Maintenance Adherence Index that shows Penske customers how maintenance affects performance and tracks PM compliance and currency. Improving overall asset utilization and minimizing downtime can indirectly maximize productivity across the fleet.
Work With Penske
Reliable equipment, preventive maintenance, roadside support, and access to replacement vehicles all play an important role in helping fleets stay compliant with hours of service regulations. To learn more, contact us today.