1. **Hours of Service (HOS) Rules**:
    CDL drivers must adhere to strict HOS rules, which limit the number of hours they can drive and work per day and week. This includes mandatory rest breaks to prevent fatigue-related accidents.
  1. **Vehicle Inspection Requirements**:
    Drivers must conduct pre-trip, in-route, and post-trip inspections of their vehicles. Any safety-related defects must be reported and repaired before the vehicle is operated.
  1. **Drug and Alcohol Testing**:
    CDL operators are subject to random, post-accident, and reasonable suspicion drug and alcohol testing. A positive test can result in suspension or revocation of the CDL.
  1. **Commercial Driver’s License Standards**:
    Obtaining and maintaining a CDL requires passing specific knowledge and skills tests. Operators must also meet medical qualifications and carry a valid medical certificate.
  1. **Electronic Logging Devices (ELDs)**:
    Most CDL drivers are required to use ELDs to track their driving hours electronically. This is part of the effort to ensure compliance with HOS regulations.
  1. **Hazardous Materials (HazMat) Regulations**:
    If transporting hazardous materials, drivers must have a HazMat endorsement on their CDL and comply with specific regulations regarding the transport, labeling, and handling of hazardous materials.
  1. **Weight and Size Limits**:
    Operators must ensure that their vehicle does not exceed federal weight and size limits. Overweight or oversized vehicles require special permits and routes.
  1. **Medical Certification**:
    CDL drivers must carry a current Medical Examiner’s Certificate (MEC), showing they meet the physical qualifications to operate a commercial vehicle safely.
  1. **Cargo Securement**:
    The DOT has strict guidelines on how cargo must be secured to prevent shifting or falling during transit. Drivers must ensure that all cargo is properly secured before driving.
  1. **Driver Qualification Files**:
    Employers are required to maintain a Driver Qualification File (DQF) for each CDL operator, which includes the driver’s application, employment history, driving records, and medical certification. Drivers should ensure that this information is accurate and up to date.