70-Hour 8-Day Rule: HOS Limits, 34-Hour Restart, and Penalties

The 70-hour/8-day rule bars a commercial property-carrying driver from getting behind the wheel once on-duty time reaches 70 hours across any rolling eight-day period. It applies when your carrier operates commercial vehicles every day of the week, and it runs alongside daily driving and rest limits under 49 CFR 395.3.¹ A full 34 consecutive hours off duty resets the count to zero.

Who’s on the 70/8 Cycle

Your cycle depends on your carrier’s operating schedule, not your preference. Carriers that run vehicles every day of the week put their drivers on the 70-hour/8-day cycle. Carriers that don’t operate daily fall under a lower ceiling: 60 hours in any 7 consecutive days.¹ Most large long-haul fleets run seven days a week, so their drivers are on the 70/8.

The designation is company-wide. FMCSA has said a carrier operating under the 70/8 cannot selectively drop some drivers onto the 60/7.²

What Counts Toward Your 70 Hours

Every hour you’re working or required to be ready to work counts. On-duty time isn’t just time behind the wheel. FMCSA’s driver guide includes:³

All driving time.
Waiting to be dispatched at terminals, shippers, or anywhere else you haven’t been released from duty.
Pre-trip and post-trip inspections, fueling, and other vehicle servicing.
Loading, unloading, supervising cargo handling, or just standing by while it happens.
Time spent getting assistance or waiting with a broken-down vehicle.
Any compensated work for any employer, including a non-driving side job.

Two things stay outside the count. Rest in a compliant sleeper berth logs as off-duty. So does personal conveyance, meaning movement of the truck for purely personal reasons after you’ve been fully relieved from work.⁴

How the Rolling 8-Day Window Works

The 8 days aren’t a calendar week. It’s a sliding window that recalculates each day. At any moment, your available driving hours equal 70 minus the total on-duty time for today plus the seven days before it.¹

Say you worked 12 on-duty hours eight days ago. When midnight passes and that day drops off the back, those 12 hours are freed up and your available balance climbs by 12. The flip side: a stretch of heavy days in the recent past leaves you with almost no available hours even early in the week. Drivers who consistently run 10 to 12 on-duty hours a day will hit the 70-hour wall by day six or seven and can’t drive again until lighter days start rolling off.

Your available time shifts every night. Someone coming off a light week might have nearly the full 70 available; someone coming off a heavy stretch might have only a few hours to spend before stopping.

The 34-Hour Restart

You don’t have to wait for old days to cycle off. Take at least 34 consecutive hours completely off duty and your 8-day accumulation wipes to zero. You start fresh with the full 70 hours available.¹ Sleeper berth time counts toward the 34, and you can combine sleeper time with other off-duty time to reach it.³

The restart is optional. There’s no limit on how often you can use it. The 34 hours must be uninterrupted, though. Any work activity during that window breaks the chain, and you’re back to waiting for the rolling window to help you.

An earlier version of the rule required the restart to include two overnight periods between 1 a.m. and 5 a.m. and capped restarts at once per 168 hours. Both restrictions came off in 2017.⁵

Daily Limits That Can Stop You First

The 70-hour cap is the weekly ceiling. Separate daily limits apply to each shift, and any one of them can shut you down even if you still have plenty of weekly hours banked:

Ten consecutive hours off duty before you can start driving again.
A 14-hour on-duty window that begins when you come on duty. After 14 consecutive hours have passed, you can’t drive, and the clock doesn’t pause for breaks.
An 11-hour maximum of actual driving inside that 14-hour window.
A 30-minute break required after 8 cumulative hours of driving without an interruption. Any non-driving status satisfies it, including off-duty, sleeper berth, or on-duty non-driving work like paperwork.

All four sit in the same regulation.¹ Whichever limit you hit first controls. Burn 11 driving hours in a shift and you stop, no matter how many weekly hours remain.

Short-Haul Drivers

Drivers who stay within 150 air-miles (about 173 statute miles) of their normal reporting location, return there, and are released within 14 consecutive hours qualify for the short-haul exemption.⁶ The benefit is paperwork: no detailed record of duty status, no ELD requirement. The carrier still keeps basic time records for at least six months. The 70-hour/8-day cap and the daily driving caps still apply.

When You Can Push Past the Limits

Adverse Driving Conditions

Hit unexpected weather, a road closure, or unusual traffic that makes it unsafe to stop, and you can drive up to 2 additional hours beyond your normal daily limits to reach a safe place. The conditions must be something you couldn’t reasonably have known about before starting.⁶ That stretches the 11-hour driving cap to 13 and the 14-hour window to 16 for the day. It does not add anything to your 70-hour weekly total.

Emergency Declarations

When the President, a state governor, or FMCSA declares an emergency, drivers providing direct relief assistance can be exempted from HOS rules entirely, including the 70/8 cap. The exemption lasts up to 30 days unless FMCSA extends it and covers every state along the route to the emergency zone.⁷ Once the emergency ends or you stop providing direct assistance, the normal rules apply again immediately.

What a Violation Costs

Federal penalties are inflation-adjusted and updated annually. Under Appendix B to Part 386:⁸

A driver faces up to $4,812 per non-recordkeeping violation.
A carrier faces up to $19,246 per non-recordkeeping violation.
Exceeding a driving-time limit by more than 3 hours is treated as egregious and triggers the maximum penalties for both driver and carrier.
Recordkeeping violations (incomplete logs, inaccurate entries) run up to $1,584 per day. Knowing falsification pushes that to $15,846 per violation.

These are per-violation numbers. One audit covering several days of problems adds up fast.

At the roadside, an inspector who finds you over the 70-hour limit or a daily cap can place you out of service on the spot. You can’t operate any commercial vehicle until you’ve accumulated enough off-duty time to be compliant again. The carrier is on the hook too. FMCSA has said a carrier doesn’t need actual knowledge of a violation to be responsible; having the means to detect it is enough.⁹

How ELDs Track the Count

Most commercial drivers must use an Electronic Logging Device that syncs with the engine to capture when the truck is moving, miles covered, and engine hours.¹⁰ The device updates the 70-hour running total in real time and typically warns you as you approach the 70-hour cap, the 11-hour driving limit, or the 14-hour window. Short-haul drivers are exempt from the ELD mandate. Everyone else must have a compliant device installed, and during a roadside inspection you must be able to show your records on the screen and transfer them electronically if asked.¹¹

1
eCFR. 49 CFR 395.3 – Maximum Driving Time for Property-Carrying Vehicles
2
Federal Motor Carrier Safety Administration. If a Motor Carrier Operates Under the 70-Hour/8-Day Rule, Does Any Aspect of the 60-Hour Rule Apply to Its Operations?
3
Federal Motor Carrier Safety Administration. Interstate Truck Driver’s Guide to Hours of Service for Property Carriers
4
Federal Motor Carrier Safety Administration. Personal Conveyance
5
Federal Motor Carrier Safety Administration. Hours of Service of Drivers – Restart Provisions
6
eCFR. 49 CFR 395.1 – Scope of Rules in This Part
7
Federal Motor Carrier Safety Administration. Emergency Declarations, Waivers, Exemptions and Permits
8
eCFR. Appendix B to Part 386 – Penalty Schedule
9
Federal Motor Carrier Safety Administration. What Is the Liability of a Motor Carrier for Hours of Service Violations
10
eCFR. 49 CFR Part 395 Subpart B – Electronic Logging Devices
11
Federal Motor Carrier Safety Administration. General Information About the ELD Rule