From that statement, it gives two options to restrain a perp. One by seatbelt, and the other by whatever other restraining devices the department authorizes, which could be handcuffs, leg irons, either with short chain or long chain, both, etc. That second option is open to interpretation.
“...all passengers, regardless of age and location, shall be restrained by seat belts or other authorized restraining devices.”
Thanks for that information. That puts a new light on this for sure.