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Insurance Institute for Highway Safety's Third Round of Booster Evaluations

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Khatir Soltani
As reported by Unsurance Insitute for Highway Safety

ARLINGTON, VA -- Boosters are better than they used to be at fitting lap and shoulder belts on 4 to 8-year-old kids to restrain them in a crash. So parents don't have to search as hard for a good fit for their child and vehicle. Most belt-positioning boosters, though, don't offer consistently good fit in all vehicles. This is the bottom line in the Insurance Institute for Highway Safety's third round of booster evaluations.

Researchers assessed the safety belt fit of 72 boosters, assigning the best ones the top ratings of BEST BET or GOOD BET because they correctly position belts on average booster-age kids in most vehicles. The worst performers are ones the Institute doesn't recommend because they do a poor job of fitting belts. A good booster routes the lap belt across a child's upper thighs and positions the shoulder belt at midshoulder.

The Institute doesn't conduct vehicle crash tests to evaluate boosters because boosters don't do the restraining in a crash. It's the fit of the belt that's important.

Boosters elevate children so safety belts designed for adults will fit better. The lap belt should fit flat across a child’s upper thighs, not the soft abdomen. Good boosters have belt-routing features that hold lap belts down and forward. The shoulder belt should cross snugly over the middle of the shoulder. Then it’s in position to provide effective protection in a crash. (Photo: Insurance Institute for Highway Safety)

"For the first time top-rated boosters outnumber ones the Institute doesn't recommend," says Anne McCartt, Institute senior vice president for research. "Now more than ever manufacturers are paying attention to belt fit, and it's showing up in our ratings."

21 Good Choices!
Twenty-one boosters are BEST BET models, and 7 earn GOOD BET (see list on p.2). Another 8 aren't recommended at all. This represents a market shift. Last year only 9 seats out of 60 the Institute evaluated earned BEST BET.

Even though poor performers make up a smaller percentage of boosters evaluated this year, 36 fall in the middle because they don't consistently fit belts well on most kids in most cars, minivans, and SUVs. Most of these are backless boosters with good lap belt scores but not good shoulder belt scores.

"Unlike the top performers, consumers can't assume boosters in the in-between group will work in every family vehicle. Some may be fine, but parents still need to try them out to see if the lap and shoulder belts fit their kids correctly," McCartt says. Obvious red flags are lap belts that ride up on the tummy and shoulder belts that either fall off the shoulder or rub against a child's neck. McCartt advises parents to keep looking until they find a booster that fits.

Institute engineers assess boosters using a crash test dummy representing an average-size 6 year-old. They measure how 3-point lap and shoulder belts fit the dummy in each of the boosters under 4 conditions spanning the range of belt configurations in a wide variety of vehicle types. A booster's overall rating is based on the range of scores for each measurement.
Khatir Soltani
Khatir Soltani
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