What is the purpose of a Commercial Driver's License?

The purpose of a Commercial Driver's License (CDL) is to ensure that drivers meet specific safety standards. Obtaining a CDL involves rigorous training and testing that focuses on various aspects of driving large or heavy vehicles. This training is crucial because commercial vehicles often carry more weight, have different handling characteristics, and may transport hazardous materials. The standards outlined in the CDL requirements are designed to ensure that drivers possess the necessary skills and knowledge to operate these vehicles safely, thus promoting overall roadway safety for all users.

The other options, while related to driving in some way, don't accurately reflect the main purpose of a CDL. Unlicensed driving on public roads is illegal and goes against the very foundation of licensing. Reducing traffic fees for commercial vehicles is not a primary function of the CDL, and while a CDL does facilitate interstate travel, it does not eliminate restrictions; certain regulations and requirements still apply across state lines.