See also:

One Person Per Belt
Two people (including children) should never attempt to use a single seat belt. This could increase the severity of injuries in case of an accident. ...

Injured Person
A seat belt should be used when an injured person is being transported. When this is necessary, you should consult a physician for recommendations. ...

Child Restraint System Installation on Rear Seat Center Position
Use the center seat belt for the rear seat to secure the child restraint system as illustrated. After installation of the child restraint system, rock the child seat back and forth, and side to ...