FMCSA Hours of Service Rules Explained Simply

Hours of Service regulations are the most confusing part of trucking for new drivers — and even experienced drivers get tripped up. Here's the breakdown in plain English, based on current FMCSA regulations.

The Core Rules

11-Hour Driving Limit: You can drive a maximum of 11 hours after 10 consecutive hours off duty. This is your driving clock — once you hit 11 hours of actual driving, you must stop.

14-Hour Window: You cannot drive beyond the 14th hour after coming on duty. This clock runs continuously once you start your day, regardless of breaks. Even if you only drove 5 hours, once 14 hours have passed since you came on duty, you cannot drive.

30-Minute Break: You must take a 30-minute break after 8 cumulative hours of driving. This can be off-duty, sleeper berth, or on-duty not driving.

Weekly Limits

60/70-Hour Limit: You cannot drive after being on duty for 60 hours in 7 consecutive days, or 70 hours in 8 consecutive days. Most carriers use the 70/8 schedule. Your ELD tracks this automatically.

34-Hour Restart: You can reset your weekly hours by taking 34 consecutive hours off duty. This effectively gives you a fresh 70-hour clock.

Common Mistakes

The most common HOS violation is driving past the 14-hour window. Drivers often confuse the 11-hour driving limit with the 14-hour on-duty window — they think breaks pause the 14-hour clock, but they don't. Another common mistake: forgetting that the 30-minute break requirement resets based on 8 hours of driving, not 8 hours of on-duty time.

Exceptions You Should Know

The short-haul exception (150 air-mile radius, report to same location) exempts you from keeping a log. The adverse driving condition exception gives you 2 extra driving hours in bad weather. The 16-hour short-haul exception allows one 16-hour window per week for drivers who return to their reporting location daily.