The Insurance Institute for Highway Safety (IIHS) has introduced a crucial new whiplash test for small SUVs, a highly popular vehicle segment in the U.S. This new testing protocol addresses the increasing energy transfer in vehicle-to-vehicle crashes, a direct consequence of vehicles becoming heavier over time, making advanced safety equipment and rigorous testing more critical than ever for public well-being. This article details the improvements in the new test, how it's performed, and the meaning behind the IIHS ratings, setting the stage for evaluating how the first 18 2024–26 small SUVs have fared.

Neck injuries resulting from rear-end collisions can be debilitating, often life-altering or even life-threatening. Recognizing the severe impact of such injuries, head restraint testing has always been a vital component of IIHS evaluations. However, the original whiplash testing method, active until 2022, had become outdated. The previous test involved removing a seat from a vehicle, attaching it to a sled, and simulating a single energy pulse equivalent to an impact from a similarly weighted vehicle at 20 mph. By 2022, automakers had largely achieved "good" ratings (the highest safety rating across all IIHS tests) under this old standard, yet neck injuries remained a significant concern, necessitating a more stringent and modern evaluation.

The updated whiplash test retains the fundamental approach of using a removed seat mounted on a sled to simulate impact. However, it significantly improves upon the old method by introducing new energy pulses that simulate both 20-mph and 30-mph impacts, providing a more comprehensive assessment of crash performance. Beyond the increased impact speeds, the new test incorporates additional critical metrics. These include measuring the movement of the test dummy’s pelvis relative to its head and evaluating the bending force exerted on the head relative to the neck in both forward and backward directions. This enhanced evaluation framework aims to base ratings on comprehensive injury prevention, considering factors such as head and spine support, how effectively the head interacts with the head restraint, and the seat's ability to manage the energy transferred to the dummy's body during the collision.

Consistent with standard IIHS practice, the whiplash test employs a four-tier rating system: "good," "acceptable," "marginal," and "poor." These ratings are determined by a demerits system, similar to a golf game where a lower score indicates a higher ranking. A vehicle earns a "good" rating by scoring between 0 and 3 demerit points. "Acceptable" ratings are given to vehicles that accumulate 4 to 6 points. Vehicles receiving 7 to 9 points are rated "marginal," while those with 10 to 18 points (with 18 being the maximum possible) are classified as "poor." This rigorous demerits system ensures a precise and objective assessment of a vehicle's ability to protect occupants from whiplash injuries in rear-end crashes.