Final answer:
A holder of a GDL special learner's permit may have only one additional passenger in the vehicle, excluding dependents, unless they are accompanied by a parent or guardian.
Step-by-step explanation:
The question pertains to the regulations surrounding a Graduated Driver's License (GDL) special learner's permit. According to the GDL restrictions, excluding dependents, the holder of a validated GDL special learner's permit may have only one additional passenger in the vehicle unless accompanied by a parent or guardian. This rule is implemented to help reduce distractions and increase safety for new drivers.