JJ Keller Entry Level Driver Training for CDL (Commercial Driver’s License) Practice Test 2026 - Free CDL Practice Questions and Study Guide

The 14-hour limit is a key regulation that dictates how long a commercial driver can be on duty following a consecutive 10-hour off-duty period. This limit encompasses all on-duty time, including driving time as well as any other tasks related to driving, such as loading or unloading cargo, performing vehicle inspections, and waiting for freight. Therefore, the correct understanding is that the 14-hour clock starts when a driver comes on duty and runs continuously until they reach the limit, regardless of whether they are behind the wheel or not during that time.

The 14-hour limit is designed to ensure that drivers do not become overly fatigued, promoting safety on the roads. Since it includes both driving and non-driving duties, drivers must keep careful track of their worked hours. This regulation does not reset until a driver takes a mandatory off-duty period, making it crucial for drivers to manage their time effectively to comply with federal hours-of-service regulations.