According to the Ohio Bureau of Motor Vehicles (BMV) notes the following restrictions for temporary permit holders / probationary driver's license holders under the age of 18:

• Probationary driver license holders under the age of 17 will not be permitted to operate a motor vehicle with more than one person who is not a family member in the vehicle, unless accompanied by the license holder’s parent, guardian, or legal custodian. Studies conducted by the Insurance Institute for Highway Safety have shown that one passenger doubles the risk of a fatal crash among teen drivers, two passengers triple the risk, and three or more passengers increase the risk by more than six.
• Probationary driver license holders between 17 and 18 years of age will be restricted from driving between the hours of 1:00 a.m. and 5:00 a.m. unless the holder is accompanied by a parent or guardian, with the following exceptions: an emergency situation, driving to or from a school activity, or driving to or from work. Travel to or from work is permitted provided the teen has written documentation from the employer.
• Probationary license holders under the age of 17 are prohibited from driving between 12:00 a.m. (midnight) and 6:00 a.m. unless accompanied by a parent or guardian with the same exceptions as above. This is a change to the previous restriction of 1:00 a.m. to 5:00 a.m.
• Permit holders under the age of 18 will be prohibited from driving between the hours of midnight and 6 a.m., unless accompanied by a parent, guardian, or legal custodian who holds a valid license. This is a change to the previous restriction of 1:00 a.m. to 5:00 a.m.
• If a probationary driver license holder under the age of 17 is convicted of having committed one moving violation during the first six months of having a driver license, the person must be accompanied by a parent or guardian whenever operating a motor vehicle during the six-month period commencing on the date on which the person is convicted of or pleads guilty to the moving violation or until the person attains the age of 17.
• Safety belts must be available to all passengers, and everyone must be buckled up. This applies to all Temporary Permit holders and those Licensed Drivers under age 18.

So it appears that if you were 16 and had a probationary license you could only have one passenger or occupant in the car that was not a family member unless you had your parent in the vehicle as a supervising adult. However at age 17 if you have a probationary license, not just a permit, it seems that this restriction is lifted. The number of vehicle occupants though is still limited to the total number of originally installed safety belts. All occupants must be wearing safety belts when the vehicle is being driven by a probationary license holder per OH law.

To read more about the conditions and restrictions of a permit holder and probationary driver's license holder in Ohio you can go to the BMV site or read through sections of the Ohio Revised Code (ORC). ORC sections 4507.05 and 4507.071 specifically address the graduated driver licensing (GDL) process and conditions associated with the GDL types.

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