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Hours of Service Rules Explained Simply

9 min read

Hours of Service (HOS) regulations exist to prevent fatigued driving. They're federal law, enforced through ELDs and roadside inspections. Understanding them is essential for staying compliant and avoiding fines.

The Core Rules

11-Hour Driving Limit

You may drive a maximum of 11 hours after 10 consecutive hours off duty.

This is your actual driving time. Once you've driven 11 hours since your last 10-hour break, you must stop driving until you take another 10-hour break.

14-Hour On-Duty Limit

You may not drive beyond the 14th consecutive hour after coming on duty, following 10 consecutive hours off duty.

This is a window, not a bank. Once 14 hours have passed since you came on duty, you cannot drive again until you take a 10-hour break—even if you haven't used all 11 driving hours.

Key point: Time spent loading, fueling, doing paperwork, or waiting all counts against your 14-hour window. It doesn't use driving hours, but it shrinks your available window.

30-Minute Break Requirement

After 8 cumulative hours of driving, you must take a 30-minute break before driving again.

This break can be satisfied by any off-duty period or sleeper berth time of at least 30 minutes, or on-duty not driving time (as of 2020 rule changes).

60/70-Hour Limit

You may not drive after 60/70 hours on duty in 7/8 consecutive days.

60 hours in 7 days: For carriers that don't operate every day of the week
70 hours in 8 days: For carriers that operate every day

This is a rolling calculation. Each day, the oldest day's hours drop off, and today's hours are added.

34-Hour Restart

You can reset your 60/70-hour clock by taking at least 34 consecutive hours off duty.

After a valid 34-hour restart, your available hours reset to 60 or 70 (depending on your carrier's operation schedule).

The Sleeper Berth Provision

Drivers using a sleeper berth can split their required 10-hour off-duty period:

One period must be at least 7 consecutive hours in the sleeper berth
The other period must be at least 2 consecutive hours either off duty or in the sleeper
Neither period counts against your 14-hour window

This provides flexibility for team driving and managing delivery appointments.

Adverse Driving Conditions

If you encounter unexpected adverse conditions (weather, traffic, road closures), you may extend your driving time by up to 2 hours to reach your destination or a safe stopping point.

This extends only driving time, not the 14-hour window. And it must be truly unexpected—checking the weather and driving into a known storm doesn't count.

Short-Haul Exception

Drivers who operate within a 150 air-mile radius of their work reporting location and return to that location within 14 hours may:

Use timecards instead of ELDs/logs
Be exempt from the 30-minute break requirement

You must return to your starting point and be released from duty within 14 hours of starting. If you exceed these limits, you need a full log for that day.

Common Violations

Driving beyond 11 hours: Often happens when underestimating trip time
Exceeding 14-hour window: Long waits at shippers/receivers eat your clock
Missing 30-minute break: Easy to forget when you're making good time
Form and manner errors: Incorrect or incomplete logs
False logs: Serious violation with severe penalties

Penalties

HOS violations carry serious consequences:

Fines up to $16,000 per violation for drivers
Being placed out of service (can't drive until hours reset)
CSA points affecting your safety score
Potential loss of CDL for pattern violations

Tips for Managing Your Clock

Plan ahead: Know your available hours before accepting loads
Account for delays: Build buffer time for loading, traffic, weather
Communicate with shippers: Don't let detention eat your clock
Use the sleeper provision: Split sleeper can provide flexibility
Know your restart options: A 34-hour restart can be strategic
Don't cheat: It's not worth the risk. Ever.

ELD Requirements

Most drivers must use an Electronic Logging Device (ELD) to record HOS. The device automatically records driving time when the vehicle moves. You're responsible for ensuring duty status changes are accurately recorded.

ELDs have reduced flexibility compared to paper logs—there's no fudging the numbers when a computer is recording your movement.

Summary

HOS rules boil down to:

11 hours of driving per day maximum
Within a 14-hour window
With a 30-minute break after 8 hours of driving
No more than 60/70 hours in 7/8 days
Reset with 10 hours off daily or 34-hour restart weekly

Understand the rules. Plan your trips accordingly. And never sacrifice safety or compliance for a load. No freight is worth your license or your life.

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