The four numbers everyone needs to know
The federal Hours of Service rules for property-carrying drivers come down to four big numbers: eleven hours of driving time, fourteen hours total on-duty window, thirty-minute mandatory break after eight hours of driving, and either sixty hours in seven days or seventy hours in eight days as the rolling cumulative cap.
The eleven-hour rule limits you to eleven hours of actual driving time after ten consecutive hours off duty. The fourteen-hour rule says that no driving may occur after the fourteenth hour from your first on-duty status of the day, regardless of how much off-duty time you take inside that window. The thirty-minute break must occur before you have driven for more than eight cumulative hours.
The split-sleeper-berth provision
The split-sleeper-berth provision lets you split your ten hours of off-duty time into two periods, neither of which is shorter than two hours, with at least one of which is at least seven hours in the sleeper berth. Used correctly, this gives long-haul drivers flexibility to rest when conditions are right rather than at fixed times — and it is a frequent CDL test topic because misuse is a frequent enforcement issue.
Logbooks and ELDs
Most property-carrying CDL drivers must use an Electronic Logging Device (ELD) to record duty status. Paper logbooks are still permitted in narrow circumstances — short-haul exemptions, drivers working within a one-hundred-fifty-air-mile radius, drive-away tow-away operators, and certain pre-2000 vehicles. The CDL exam will probe whether you understand both formats and the duty-status categories: off duty, sleeper berth, driving, and on duty (not driving).
For drivers preparing for Hours of Service Basics, additional context — including federal manual excerpts, employer hiring practices, and DOT medical guidance — is widely available from industry resources. Continue reading on a recommended industry resource for further detail. Always cross-check anything you read with the current edition of your state CDL manual, since enforcement guidance is updated periodically.