What is the main restriction associated with a Commercial Learner's Permit (CLP)?

The main restriction associated with a Commercial Learner's Permit (CLP) is that it restricts the holder to operating commercial motor vehicles specifically for training purposes. This means that the individual with a CLP is allowed to drive a commercial motor vehicle on public roads but must be accompanied by a qualified CDL (Commercial Driver's License) holder who supervises them. This regulation is in place to ensure safety during the learning process, as the individual has not yet obtained the full commercial driver's license that certifies them to operate such vehicles independently.

The other options do not accurately describe the core restrictions of a CLP. For example, using a CLP on highways is permitted as long as the learner is accompanied by a qualified driver. Additionally, a CLP is not limited to just passenger vehicles; it encompasses various types of commercial vehicles based on the endorsements and classifications applicable to the learner. Furthermore, while there may be time limitations on the validity of the permit in some jurisdictions, it is not universally restricted to a three-month period. Thus, C effectively captures the essence of what a CLP entails in terms of operational restrictions.