CBC News – Consumer Life – Few booster seats keep child secure:

“Booster seats Seat belts are designed with a 165-pound man in mind. With kids, the lap belt tends to ride up on the abdomen, and the shoulder belt often cuts across the face or neck. Children can be injured by seat belts that do not fit them correctly as well as by belts that are not worn correctly. Booster seats were designed to correct this problem for most children between the ages of four and eight (or weighing up to 36 kilograms, or 80 pounds). They raise children to a height at which lap and shoulder belts can be worn correctly. The booster seat is held in place by the seatbelt. It is not tethered to the car like a child car seat. Children using seat belts instead of booster seats are 3.5 times more likely to suffer significant injury and four times more likely to suffer head injury.”