Hours of Service Rules, in Plain English

The four clocks

Hours of service is not one limit. It is four clocks running at once, each started by a different event, and the day ends when the first of them runs out. Drivers who get violations rarely misread a single rule; they watch the driving clock and forget that the window has been running since they touched the truck.

Two of the four stop. The driving clock and the window both freeze the moment you take 10 consecutive hours off duty, and they restart from full. The weekly clock does not freeze — it only rolls, dropping the oldest day as each new one arrives, unless you take a 34-hour restart.

A day, hour by hour

The window is the one that surprises people. It starts when you come on duty after your 10 hours off — not when you start driving — and it does not stop for lunch, for a two-hour dock wait, or for a nap in the bunk. At hour 14 you may not drive again until you have taken another 10 off, even if you have driving hours left.

In the strip above the driver burned three hours at a shipper before turning a wheel. Eleven driving hours were still available; the window was not. This is why detention time is a compliance problem and not only a money problem, and why the hours of service calculator shows both clocks side by side rather than a single number.

The 30-minute break

The break rule counts driving time, not elapsed time. You may not drive once 8 hours of driving have passed without a consecutive 30-minute interruption of driving status. Since the 2020 amendment the interruption no longer has to be off duty: off duty, sleeper berth, on-duty-not-driving, or any combination of the three all satisfy it.

60 and 70, and which you are on

Which weekly limit applies is a fact about the carrier, not the driver. A carrier that does not operate commercial vehicles every day of the week runs its drivers on 60 hours in 7 consecutive days. A carrier that does operate every day runs 70 in 8. One truck that never moves on Sunday does not make a fleet a 60-hour carrier if another truck runs that day.

The period is rolling. On day 9 the hours from day 1 fall off and come back to you — the "recap". Plenty of owner-operators never take a restart at all and simply live on the recap, which is legal and often faster than parking for 34 hours.

Where carriers get it wrong

• 01Treating the window as pausable. It is not. Only 10 consecutive hours off duty (or a qualifying sleeper split) resets it.
• 02Logging yard moves as off duty. Moving the truck on carrier property is on duty, and on an ELD it will be recorded whatever the driver selects.
• 03Assuming a short-haul day needs no log. The short-haul exception in §395.1(e) also removes the break requirement — but only while every one of its conditions holds, and it fails silently the day a driver returns late.