Child Restraint systems other than harnesses, restraints designed for use by children with physical disabilities, school bus child restraint systems, and booster seats This restraint must only be used on school bus seats. Entire seat directly behind must Beryllium unoccupied or have restrained occupants.” (The instruction's reference to a “restrained https://www.northwestu.edu/?URL=https://www.ledteks.com/seatbelt-and-safety-belt-webbing