The 70-Hour Rule, Explained

By Avery Schwartz · Former CDL-A driver, 3 years OTR

Three clocks, stacked

Hours of service is three limits running at once, and the tightest one always wins. The 11-hour limit caps driving after 10 consecutive hours off. The 14-hour window starts when you come on duty and doesn't pause for lunch, fuel, or a three-hour dock — when it closes, you're done driving no matter how few miles you turned. And over the top of both runs the weekly clock this guide is about: no driving after 70 hours on duty in any 8 consecutive days (for carriers that operate every day of the week — everyone else runs 60 in 7). The daily clocks decide your day; the 70 decides your week. Drivers blow the weekly clock less often, but when they do it costs more, because there's no legal way to drive out of it — only time brings it back.

The rolling window, drawn on a napkin

Forget calendar weeks. At any moment, the question is: how many on-duty hours do the last 8 days hold — today plus the previous seven? If the answer is 70, you can't drive a CMV until hours leave the window, and hours only leave one way: by getting old. Every midnight, the day that's now nine days back falls off the edge, and whatever you worked that day comes back to you. Those are your recap hours.

Say your last seven days were 11, 10, 9, 8, 11, 10, and 5 on-duty hours. That's 64 used, so you have 6 available today. Tonight, that oldest 5-hour day drops off — but if you work your 6 today, tomorrow's window holds 64 − 5 + 6 = 65, leaving just 5. Now rearrange the same week so an 11-hour day is the one aging out, and tomorrow hands you 11 fresh hours instead. Same total fatigue, completely different schedule — the order of your days matters as much as their sum. That's the entire skill of running recaps: before deciding how hard to push today, look at what's falling off the back tonight. The 70-hour calculator does the projection from the seven numbers on your ELD's recap screen.

The pace that never runs dry

Divide 70 by 8 and you get the most useful number in the whole regulation: 8 hours 45 minutes a day. Average at or under that and your recaps replace what you burn, forever — no restart required. On the 60/7 rule the pace is about 8:34. Steady fleets are built on this arithmetic: dedicated runs planned at 8½ on-duty hours a day just quietly never hit the wall. If your operation keeps slamming into the 70 with three days of work left, that's not bad luck — it's a schedule that averages more than 8:45 and pretends it doesn't.

The 34-hour restart: when, not whether

Take 34 consecutive hours off duty or in the sleeper and the window empties — you start the next morning with a full 70 as if the last week never happened. It's optional for property carriers, and that's the strategic part. If the days about to age out of your window are big ones, running recaps may serve you better than parking: you're getting 10 and 11 hours back nightly for free. If the aging days are small — you're staring at a run of 5- and 6-hour tomorrows — the restart is the better trade. The classic play is taking it where you'd rather be anyway: home for the weekend, or somewhere with a shower, laundry, and decent parking rather than a ramp in the middle of nowhere. What a restart never does is fix today: if you're out of hours at 2 p.m., you're out until the 34 clears or midnight recaps something back.

What actually counts against the 70

Everything on the on-duty line, driving or not: pre-trips, fueling, load securement, paperwork, dock time when you're not released, and any work for any employer — including your side job, which surprises people at audits. What doesn't count: off-duty time and legitimate sleeper time. This is why the drivers who last guard their duty status like money. Waiting out a live unload? Get released in writing and flag off-duty. A 45-minute fuel-and-food stop logged on-duty three times a day is two and a quarter hours a day — nearly a full driving day gone every week to habit. Log it honestly, but log it correctly; the regulation charges you for work, not for existing near the truck. And know your ELD's clock: days roll at midnight home-terminal time, so a West Coast driver working the East Coast gets recap hours at 3 a.m. local, which changes when a morning start makes sense.

Two myths worth killing

First: the split sleeper. The 7/3 and 8/2 splits are daily-clock tools — they pause the 14-hour window, and they're genuinely useful for beating a dock delay. What they do not do is stretch the 70. Every on-duty hour still lands in the weekly window no matter how cleverly your sleeper time is arranged around it. Second: personal conveyance. PC is off-duty movement of the truck for your own purposes — finding safe parking after a shipper kicks you out, getting to food. It is not a way to finish a delivery with an empty clock, and inspectors read PC logs with exactly that suspicion. Both tools are legitimate used straight and violations used creatively, and the ELD remembers which one you did.

What a violation actually costs

Drive past your 70 and get inspected, and you're placed out of service on the spot — typically 34 hours of sitting wherever the inspector found you, with the load late and the broker learning why. The violation lands on the carrier's CSA profile and follows your PSP record to your next job application. States fine per violation and the FMCSA can go after carriers civilly for patterns of it. Nobody involved thinks the 600 extra revenue miles were worth it. If dispatch leans on you to run past the clock, that's not a gray area — coercion is its own violation, and your ELD is the receipt that protects you.

Making the clock work for you

Run the seven numbers off your recap screen every evening, watch what's falling off tonight, keep the 8:45 average in your head, and restart when the recaps ahead look thin instead of by reflex every weekend. Hours are inventory. The drivers who get paid best per hour of clock aren't driving faster — they're just not spending inventory on things that don't move the truck. Your days-away count also drives the biggest deduction in trucking, so while you're counting: per diem calculator.

Run the numbers