Laws today in most states require the driver and every passenger, including children and infants, to have his or her own seat belt; therefore your limit on the number of passengers is the number of belted seats minus the one for the driver. Placing two passengers within one seat belt is never allowed and is not safe. Placing a child or infant on your lap under your lap belt is extremely risky to the child, who could be crushed in even a sudden stop. Of course, riding anyone on your lap unbelted is unsafe and not allowed. In many states, new drivers are not allowed to carry passengers at all, except perhaps for family members. As laws vary by state, the driver will have to check the state regulations. (Most know the following; it is only mentioned because of a recent, dangerous fad. Anyone riding on the outside of a vehicle is almost certain to be injured, crippled, or killed.)
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