What is the primary purpose of the tanker endorsement on a CDL?

The primary purpose of the tanker endorsement on a CDL is to allow the holder to transport liquids in bulk tanks. This endorsement ensures that the driver is trained and knowledgeable about the specific handling, safety, and operational requirements involved in transporting liquid cargo. Tankers carry unique challenges, such as the sloshing of liquid cargo, which can affect vehicle stability and control, requiring specialized skills and understanding to operate safely.

While enhancing vehicle safety, enabling cross-state driving, and increasing cargo capacity are important aspects of commercial driving, they do not capture the specific regulatory and practical purpose of the tanker endorsement. The endorsement is specifically designed for the safe transport of liquid bulk materials, making it essential for drivers who intend to operate tank vehicles.