The 11-Hour Driving Limit and 14-Hour Window
The Federal Motor Carrier Safety Administration (FMCSA) Hours of Service (HOS) regulations are among the most important compliance requirements a CDL driver must master — violations carry significant fines, out-of-service orders, and, most critically, are a leading factor in fatigue-related crashes. The regulations apply to drivers of commercial motor vehicles (CMVs) in interstate commerce; intrastate drivers are governed by state regulations that often mirror federal rules. The property-carrying driver's core daily limits: the 11-hour driving limit and the 14-hour on-duty window. After 10 consecutive hours off duty (or a qualifying sleeper berth split), a driver may drive a maximum of 11 hours. This is a driving-time limit, not an on-duty limit — time spent on-duty not driving (loading/unloading, fueling, pre-trip inspections, waiting at a shipper dock) does not consume driving time but does consume the 14-hour window. The 14-hour on-duty window: once a driver comes on duty after 10 consecutive hours off, they have a 14-hour window within which all driving must occur. If a driver comes on duty at 6:00 AM, the 14-hour window closes at 8:00 PM. After 8:00 PM, the driver cannot drive — regardless of how many of the 11 driving hours they have used. A driver who spent 4 hours on-duty not driving (DOT inspections, dock wait, pre-trip) has reduced the available driving time within the window to a maximum of 10 driving hours remaining, but the 14-hour window still closes at 8:00 PM. The 10-hour off-duty reset: to restart a new 11-hour driving limit and 14-hour window, the driver must take at least 10 consecutive hours off duty. Sleeper berth provisions allow a split-sleeper option (8-hour + 2-hour sleeper berth periods) that extends the window for drivers using a berth, subject to specific conditions.