PRODUCT LIABILITY Risk Evaluation and Assessment Understanding the Challenges of Child

By Tara T. Amenson Use, Fit, and Compatibility

Accident reconstructionists need to evaluate correct Considering the myriad of crash modes occurring in the installation and use, real world, child car seat design engineers are continuously proper fit and restraint, working to improve the safety of children, just as vehicle and vehicle compatibility manufacturers are striving to improve safety to a variety of occupants, including children. Due to ance forensically relative to the specific when analyzing design constraints at both levels, there are accident outcome. times when even the best designs are not Research by NHTSA and Safe Kids injury outcomes. optimally compatible with one another. Worldwide has shown the proper type of Coupled with this is the risk associated seat depends on the child’s age, height, with improper use of the car seats. Accord- weight, and type of vehicle in which they ing to Safe Kids Worldwide, correctly using frequently travel. To mitigate child inju- child car seats can reduce the risk of death ries during a crash, the child seat must fit by as much as 71 percent. The National the child correctly, be secured properly in Highway Traffic Safety Administration the vehicle, and the child must be properly (NHTSA) reported of the children 14 years restrained. Safe Kids recently reported 73 and younger, an average of three were percent of car seats are not used or installed killed and 642 injured every day in the correctly. If a parent has any questions or United States as a result of motor vehicle concerns about proper use or vehicle com- crashes during 2012. Child injuries and patibility, certified child passenger safety fatalities from motor vehicle crashes can technicians (CPST) are able to help at car be mitigated through proper use, fit, and seat inspection events hosted by Safe Kids. vehicle compatibility. For this reason, dur- These events are held throughout the year, ing an accident investigation, these features across the country, at local police and fire must be evaluated and assessed in order to stations, children’s hospitals, and Depart- evaluate a car seat’s design and perform- ments of Public Health.

■ Tara T. Amenson, Ph.D., is a biomedical engineer at S-E-A and a Certified Child Passenger Safety Technician (CPST). At S-E- A, Dr. Amenson’s focus is on accident investigation and analysis in an array of areas including vehicular accidents, workplace safety/ergonomics, human factors, and child product liability. She is an active member of the Society of Automotive Engineers (SAE) Child Passenger Safety group and an award-­winning author in the field of engineering.

© 2014 DRI. All rights reserved. For The Defense ■ November 2014 ■ 89 PRODUCT LIABILITY

To address the increasing challenges belt, because there is no evidence to sug- is travelling. Accident reconstructionists parents are having with child seat use and gest the use of both attachment systems need to evaluate all of these factors when vehicle compatibility, the NHTSA devel- provides additional protection. The LATCH analyzing injury outcomes. oped an Ease of Use rating program. The system consists of two clips or hooks that rating program is based on individual attach to the lower anchors located in the assessments of four categories, including back seat where the seat back and seat the evaluation of label content and clarity, cushions meet. The top tether anchor is evaluation of the installation instructions commonly located behind the seat and for the car seat, ease of using features to can be used when installing the car seat with the LATCH system or . When to use the top tether is a common source of confusion for parents. The top tether The optimal child car seat improves the safety of all forward-­facing child car seats whether they are installed system is one that is used using the lower anchors or seat belt. Child car seat vehicle compatibility, correctly every time, fits the proper use, and fit continue to be obstacles many parents struggle to overcome. There child so he or she is properly are no clear guidelines describing which car seat designs are best suited for a par- restrained, and is compatible ticular vehicle, and positioning multiple child car seats in the rear seat brings addi- with the vehicle in which tional challenges. Depending on the crash scenario, the middle seating position in the the child is travelling. rear seat is considered the safest. However, this seating position is frequently narrow or uneven making it difficult to install a secure the child correctly in the restraint child car seat properly. Additionally, many and the vehicle installation features. The vehicles do not provide LATCH anchors Ease of Use program assigns one to five in the middle seating position, but par- stars for each category. Five stars corre- ents can use the seat belt as an alternative lates to excellent features in a particu- installation approach if the child seat man- lar category. Consumers who frequently ufacturer and the vehicle manufacturer install their child’s car seat in multiple manuals give permission to do so. vehicles would want a five star rating in During a car crash, many factors con- the vehicle installation feature category, tribute to an increased risk of injury for whereas parents who rarely remove their children. Proper use, fit, and vehicle com- child’s car seat from their vehicle may find patibility must be considered when ana- a lower rating of one to two stars accept- lyzing injury outcomes of child occupants able. Unfortunately, the Ease of Use rat- post-crash. It is important to note that even ings do not address vehicle compatibility, after the appropriate child seat is selected but many child seat retailers will allow con- for the child’s age, height, and weight, it sumers to install the seat in their vehicle must be properly installed in the vehicle before purchasing. and the child must be properly restrained Passenger vehicles made on or after Sep- in the child car seat for it to mitigate inju- tember 1, 2002, are equipped with a LATCH ries during a crash effectively. Having a (Lower Anchors and Tethers for Children) trained and certified child seat technician system that was developed to make it eas- inspect the car seat and teach the caregiver ier to install child car seats. Installing a car how to install the car seat properly in the seat with seatbelts or LATCH will provide vehicle can correct many misuse errors and the same level of protection to the child; mistakes. No single child car seat is the the most important factor is to be sure the best for every vehicle or every child. The child seat is correctly installed in the vehi- optimal child car seat system is one that is cle, regardless of which installation method used correctly every time, fits the child so is used. It is recommended that only one he or she is properly restrained, and is com- system be used at a time, LATCH or seat patible with the vehicle in which the child

90 ■ For The Defense ■ November 2014