Hours of Service Rules Explained Simply: A Driver's Quick Reference

Hours of Service rules are the federal regulations that govern how long you can drive and when you have to rest. They exist to prevent fatigue-related accidents, but the rules can feel like a puzzle when you are trying to plan your day. This guide explains every HOS rule in plain English so you know exactly what you can and cannot do under the current FMCSA regulations.

The 11-Hour Driving Limit

After 10 consecutive hours off duty, you may drive a maximum of 11 hours. This is your driving window. Once you hit 11 hours of driving time on your ELD, you are done driving for the day, period. You must take another 10 consecutive hours off duty before you can drive again. Note that this is 11 hours of actual driving time, not 11 hours since you started your shift. Time spent on-duty not driving (loading, unloading, fueling, inspections) does not count against your 11-hour driving limit, but it does count against your 14-hour window.

The 14-Hour Driving Window

This is the rule that trips up most new drivers. You may not drive beyond the 14th consecutive hour after coming on duty, following 10 consecutive hours off duty. The critical thing to understand is that the 14-hour clock starts running the moment you go on duty (or start driving) and does not stop for any reason. Off-duty time during the day, meal breaks, sitting in a dock waiting to be loaded: none of these pause your 14-hour clock.

For example, if you start your day at 6:00 AM, your 14-hour window closes at 8:00 PM. If you spent 3 hours waiting at a shipper (on-duty not driving) and took a 1-hour off-duty lunch break, you still only have until 8:00 PM to finish driving, even though you only used 7 hours of actual driving time out of your 11 available. This is why shippers and receivers who keep you waiting for hours are so frustrating: they are eating your 14-hour clock while you earn nothing.

The 30-Minute Break Requirement

Before you have driven a cumulative 8 hours since your last off-duty or sleeper berth period of at least 30 minutes, you must take a break of at least 30 consecutive minutes. This break can be off-duty time or on-duty not driving time. So fueling your truck, doing a post-trip inspection, or sitting in a dock counts as long as you are not moving the truck. If you take a 30-minute break before you hit the 8-hour mark, you reset this requirement.

Many drivers incorporate this break naturally into their day by timing it with a fuel stop or meal. The key is making sure you take it before that 8-hour driving mark, not after.

The 60/70-Hour Limit

This is the weekly limit. If your carrier operates vehicles every day of the week (which most do), you are on the 70-hour/8-day cycle. You may not drive after you have been on duty for 70 hours in any 8 consecutive days. If your carrier does not operate vehicles every day of the week, you may be on the 60-hour/7-day cycle instead. Your ELD tracks this automatically.

Think of it as a rolling window. Each day, the oldest day falls off and a new day is added. If you worked 10 hours on Monday eight days ago, those 10 hours drop off your 70-hour total at midnight, giving you 10 more available hours. When your 70-hour total gets high and you are running low on available hours, you need to either take lighter days or use the 34-hour restart.

The 34-Hour Restart

If you take 34 or more consecutive hours off duty, your 70-hour clock resets to zero. This is the weekly restart that most drivers use on their days off. After a 34-hour restart, you begin the next week with a full 70 hours available. There are no longer any requirements for the restart to include specific overnight periods (that rule was proposed, implemented briefly, suspended, and ultimately dropped).

Practically, if you finish your last shift Friday evening and do not go back on duty until Sunday morning, you have taken a 34-hour restart and start fresh. Planning your restarts strategically, especially when your available hours are getting low, is a basic skill every driver should develop.

Sleeper Berth Provision

The sleeper berth split allows you to split your 10-hour off-duty period into two periods, giving you more flexibility in how you manage your day. Under the current rules, you can split your required off-duty time using one period of at least 7 hours in the sleeper berth and another period of at least 2 hours either off duty or in the sleeper berth (or a 7/3 split). The two periods combined must total at least 10 hours.

When you use the split sleeper berth provision, neither qualifying period counts against your 14-hour driving window. This is the big advantage: it effectively lets you pause your 14-hour clock. For example, you could drive for 5 hours in the morning, take a 3-hour off-duty break during the afternoon (when shippers are slow), then drive another 6 hours in the evening after a 7-hour sleeper berth period. The math gets complicated, and your ELD handles the calculations, but the sleeper berth split gives you significantly more flexibility than running a straight 11-and-14 day.

Short-Haul Exemption

If you operate within a 150 air-mile radius of your normal work reporting location and return to that location within 14 hours, you may not need to keep a Record of Duty Status (log or ELD). You still must comply with the 11-hour driving limit and the 14-hour window, but you are exempt from the ELD mandate. Your employer must maintain time records showing your start time, end time, and total hours each day. This exemption is common for local drivers who work out of a terminal and return daily.

Important: the 150-mile radius is measured in air miles (straight line), not road miles. And if you exceed the 150 air-mile radius or the 14-hour window on any given day, you must keep a full log for that day.

Adverse Driving Conditions Exception

If you encounter unexpected adverse driving conditions (snow, fog, ice, road closures) that you could not have reasonably anticipated when you started your trip, the FMCSA allows you an extra 2 hours of driving time. This extends your 11-hour driving limit to 13 hours and your 14-hour window to 16 hours. You cannot use this exception for conditions that were forecasted and known before you departed. It is meant for genuinely unexpected situations that slow you down and prevent you from completing your trip within normal hours.

Penalties for HOS Violations

HOS violations are serious. Drivers can be placed out of service (shut down for 10 hours) at roadside inspections for driving beyond their hours. Fines can reach up to $16,000 per violation for drivers and significantly more for carriers that encourage or allow violations. Repeated violations affect your CSA (Compliance, Safety, Accountability) scores, which in turn affect your employability and your carrier's safety rating. ELD data makes it very difficult to falsify logs, so compliance is not optional.

Practical Tips

• Plan your day backward from your 14-hour clock, not your 11-hour driving limit. The 14-hour window is almost always the limiting factor.
• Build buffer time into your schedule. Plan for 10 hours of driving in an 11-hour day so delays do not leave you stuck.
• Learn the sleeper berth split. It is the most powerful flexibility tool in HOS, and many drivers never use it because the rules seem confusing.
• Do not start your clock early. Stay off duty or in the sleeper until you are genuinely ready to work. Every minute counts on that 14-hour window.
• Communicate with dispatch about shipper and receiver delays. Document wait times so your carrier can pursue detention pay and so you have a record if your HOS is tight.