Hours of service regulations exist for one reason: to keep fatigued drivers off the road. For carriers, HOS rules also represent one of the most frequent sources of violations, fines, and CSA score damage in the industry.

FMCSA data shows that HOS violations appear in roughly 30% of driver inspections where logs are reviewed. Each violation adds points to your safety scores, increases insurance costs, and signals to brokers that your operation may not be reliable.

Understanding hours of service rules for trucking is not optional. It is foundational to running a compliant, profitable carrier operation. This guide breaks down the current HOS regulations for carriers and how to build systems that prevent violations before they happen.

What Are Hours of Service Rules?

Hours of service rules are federal regulations that limit how long commercial motor vehicle drivers can operate before taking mandatory rest periods. The Federal Motor Carrier Safety Administration (FMCSA) sets and enforces these rules under 49 CFR Part 395.

The regulations apply to drivers of property-carrying commercial motor vehicles (CMVs) that meet any of these criteria:

• Weigh 10,001 pounds or more (vehicle or combination)

• Have a gross vehicle weight rating of 10,001 pounds or more

• Transport hazardous materials requiring placards

• Transport 9 or more passengers for compensation

For most carrier fleets, this means every driver operating a Class 7 or Class 8 truck falls under HOS regulations. Violations are tracked through the CSA system and directly impact your ability to win freight from quality brokers and shippers.

Current Hours of Service Rules for Trucking

The current HOS rules were last updated in September 2020. Here are the limits every carrier must enforce.

11-Hour Driving Limit

Drivers may drive a maximum of 11 hours after 10 consecutive hours off duty. This is the core driving limit that most carriers and drivers know well. The 11 hours do not need to be consecutive, but once exhausted, the driver cannot operate the vehicle until completing another 10-hour off-duty period.

14-Hour On-Duty Limit

Drivers cannot drive beyond the 14th consecutive hour after coming on duty, following 10 consecutive hours off duty. This clock runs continuously once the driver starts their workday. Loading, unloading, fueling, inspections, and any other on-duty time count against the 14-hour window.

This is where many violations occur. A driver who spends three hours waiting at a shipper still loses those three hours from their 14-hour window, even though they did not drive. Carriers that track detention and accessorial charges often find that shipper delays cause downstream HOS compliance issues.

30-Minute Break Requirement

Drivers must take a 30-minute break after 8 cumulative hours of driving time. The break can be satisfied by any non-driving period of 30 consecutive minutes, including on-duty not driving time, off-duty time, or sleeper berth time.

The 2020 rule change made this requirement more flexible. Previously, the break had to occur after 8 hours on duty. Now it is tied specifically to driving time, giving drivers more flexibility in how they structure their day.

60/70-Hour Limit

Drivers cannot drive after accumulating 60 hours on duty in 7 consecutive days, or 70 hours on duty in 8 consecutive days. Most carriers operate on the 70-hour/8-day schedule.

This is a rolling calculation. Each day, the oldest day drops off and the current day is added. Carriers need systems that calculate this automatically rather than relying on drivers to track it manually.

34-Hour Restart

Drivers may restart their 60/70-hour clock by taking 34 or more consecutive hours off duty. After a valid restart, the driver begins with a fresh 60 or 70 hours available. There are no restrictions on when or how often drivers can use the restart provision.

Sleeper Berth Provision

Drivers using a sleeper berth can split their required 10-hour off-duty period into two periods, provided one period is at least 7 consecutive hours in the sleeper berth and the other is at least 2 consecutive hours either off duty or in the sleeper berth.

The 2020 rule change made this more flexible by allowing the 7/3 split to pair with a driving window extension. Properly using the sleeper berth provision requires accurate logging and ELD systems that correctly record sleeper berth time.

HOS Rules Quick Reference

HOS Exceptions Carriers Should Know

FMCSA provides several exceptions that can help carriers manage tight schedules legally. Knowing when these apply prevents both violations and unnecessary delays.

Short-Haul Exception

Drivers who operate within a 150 air-mile radius of their normal work reporting location and return to that location within 14 hours may use time cards instead of ELDs. They are also exempt from the 30-minute break requirement. This exception applies to many local and regional operations.

Adverse Driving Conditions

When drivers encounter unexpected adverse conditions like snow, fog, or highway closures, they may extend their driving time by up to 2 hours. This extends the 11-hour driving limit to 13 hours but does not extend the 14-hour on-duty window. The conditions must not have been known before dispatch.

16-Hour Short-Haul Exception

Drivers who return to their normal work reporting location and are released from duty within 16 hours (instead of 14) may use this exception once per 7-day period. The driver must have started and returned to the same location for the previous 5 duty periods.

Why HOS Violations Hurt Carriers

Hours of service violations are among the most common DOT violations carriers face. The consequences extend far beyond the immediate fine.

CSA score impact: HOS violations feed directly into your HOS Compliance BASIC score. High scores in this category trigger FMCSA intervention letters and potential audits. Brokers and shippers check these scores before tendering freight.

Driver out-of-service: An HOS violation during a roadside inspection often results in an out-of-service order. The driver cannot continue until they have completed sufficient off-duty time. This delays deliveries, causes detention charges, and damages shipper relationships.

Insurance costs: Underwriters use CSA data during renewals. Carriers with HOS compliance issues pay higher premiums, directly impacting cost per mile across the fleet.

Audit triggers: Pattern HOS violations trigger compliance reviews. During an audit, FMCSA examines not just logs but your entire operation, including driver qualification files, drug testing records, and vehicle maintenance. Carriers that fail in this industry often cite audits as a turning point.

How to Maintain HOS Compliance

Preventing HOS violations requires more than telling drivers to follow the rules. It requires systems that make compliance visible before violations occur.

Integrate ELD Data with Dispatch

The most effective way to prevent HOS violations is showing dispatchers remaining drive time before they assign loads. When a dispatcher can see that a driver has 4 hours remaining on their 11-hour clock, they will not assign a load that requires 6 hours of driving.

A TMS for carriers with ELD integration pulls this data in real time from 30+ telematics providers. Dispatchers see available hours on the same screen where they assign loads.

Build Realistic Schedules

Tight schedules that leave no margin for delays are a primary cause of HOS violations. Drivers who face termination for late deliveries will push through fatigue and falsify logs. Carriers that prioritize profit per truck over unrealistic delivery promises build more sustainable operations.

Train Dispatchers on HOS Rules

Dispatchers who do not understand HOS regulations will create schedules that violate them. Training should cover all limits, exceptions, and how shipper delays affect downstream compliance. When dispatchers understand why a driver cannot legally accept a load, they find alternatives rather than pressuring drivers.

Monitor Compliance Proactively

Reviewing HOS data weekly, not just when violations occur, helps carriers spot patterns before they become CSA problems. AI-powered fleet management tools can flag drivers approaching limits and alert dispatchers automatically.

Use Your ELD Data for More Than Logs

ELD data shows more than hours of service. Hard braking events, speeding, and excessive idling all correlate with unsafe driving violations. Carriers tracking the right operational metrics use telematics data for proactive driver coaching, not just compliance documentation.

Build HOS Compliance Into Your Operations

Datatruck is the carrier-first TMS with integrations to 30+ ELD providers. See driver hours in real time on your dispatch board, get alerts before limits are reached, and track compliance metrics across your fleet.

Stop managing HOS compliance through spreadsheets and phone calls. Build it into how your operation runs every day.

Book a free demo and see how carriers are preventing HOS violations before they happen.