What does OPCF 4 specifically grant permission for?

The OPCF 4 endorsement specifically grants permission to carry passengers for compensation, which applies predominantly to taxi drivers. This endorsement is crucial for individuals operating vehicles as taxis, ensuring they are covered under their automobile insurance policy for the specific activities tied to this form of transportation. The endorsement creates a significant differentiation from regular personal automobile insurance, which does not typically cover the use of a vehicle for commercial activities such as taxi driving.

The other options pertain to special permissions that fall outside the typical scope of the OPCF 4. Operating a school bus or carrying specific explosives and radioactive materials would generally require different endorsements or specialized insurance policies, as they involve unique risks and regulatory requirements that are not addressed by OPCF 4. Therefore, the correct understanding of OPCF 4 focuses on the context of commercial passenger transportation in a taxi service.