A car receives an excellent safety rating after passing a series of controlled crashes. Its airbags deploy correctly, the passenger compartment remains intact, and the test dummies record acceptable forces. Yet those results cannot tell the whole story if the bodies used during testing represent only a limited part of the driving population.
For decades, American vehicle safety testing relied heavily on models developed around male anatomy. Female crash-test dummies existed, but their design and use left important gaps in understanding how women experience collisions. Recent federal research has brought those limitations into sharper focus.
How the Male Body Became the Testing Standard
Early automotive crash testing developed around a midsize male model. The Hybrid III 50th-percentile male dummy, introduced in the 1980s, became a central tool for evaluating how seat belts, airbags and vehicle interiors respond during collisions. Engineers also developed smaller and larger dummies to represent different occupants, but those models were not always based on independent measurements of the bodies they were supposed to represent.
The Hybrid III fifth-percentile female dummy illustrates the problem. Designed more than 35 years ago, it relied primarily on scaled male data. It stands approximately 4 feet 11 inches tall and weighs 108 pounds, representing a relatively small adult woman rather than an average-sized female occupant. This model contributed to important safety improvements, but reducing the dimensions of a male-based design does not fully reproduce differences in female anatomy, tissue response and injury tolerance.
What Real Crash Data Reveals About Women’s Injuries
The consequences of incomplete testing become clearer when researchers examine actual collisions. In January 2026, the National Highway Traffic Safety Administration (NHTSA) released research comparing injury outcomes among male and female vehicle occupants. Women showed statistically significantly higher injury odds in 26 percent of the 150 injury models examined. The differences appeared more frequently for injuries of moderate severity than for the most serious categories.
One particularly striking finding involved frontal collisions. The study reported a 62 percent higher risk of moderate-or-greater injuries to women’s lower extremities, including the legs, knees, hips, feet and ankles. For foot and ankle injuries specifically, the estimated increase reached 128 percent. These figures describe particular outcomes under the study’s statistical models, not a universal increase in risk across every crash or injury type. They nevertheless identify parts of the body that deserve closer attention in vehicle testing.
Why Body Size Explains Only Part of the Difference
Differences in collision outcomes cannot be attributed exclusively to anatomy. Research by the Insurance Institute for Highway Safety (IIHS) found that women were more likely to be driving smaller, lighter vehicles and to occupy the vehicle being struck in certain collisions. Both circumstances can affect injury severity. When researchers compared more similar frontal crashes, many differences between male and female injury risks became substantially smaller.
However, some disparities remained, particularly for injuries involving the legs. This creates an important engineering question: which differences result from vehicle choice and crash circumstances, and which arise from the way restraint systems interact with individual bodies? The answer requires more than recording the occupant’s height and weight. Researchers must examine seating position, skeletal structure, tissue properties and how forces travel through the body during a collision.
The Limitations of Traditional Crash-Test Dummies
A crash-test dummy is a measuring instrument, not simply a human-shaped weight. Sensors record acceleration, forces and movement during impact, helping engineers estimate the likelihood of injuries. If the instrument cannot measure forces in a particular body region accurately, important information may remain hidden. A 2023 Government Accountability Office investigation found that certain dummies used in federal testing lacked the instrumentation needed to understand some lower-leg injuries.
Testing position also matters. Federal crash-test procedures have historically placed female dummies in particular passenger positions while using male models in others. Although small female dummies are used in some driver-seat regulatory tests, the distribution of test positions has not always reflected how women actually travel. A safety system may perform differently depending on the occupant’s distance from the steering wheel, seat adjustment and the position of the seat belt. Expanding testing across body types and seating positions can reveal problems that a narrower procedure misses.
The New Female Crash-Test Dummy Developed for 2026
An important development arrived in November 2025, when NHTSA released engineering specifications for the THOR fifth-percentile female dummy, known as THOR-05F. Unlike the older Hybrid III model, its design draws much more extensively on female-specific anatomical and biomechanical research. The new dummy uses substantially more sensors and provides improved measurements across the head, neck, chest, abdomen and lower extremities.
NHTSA’s technical assessment describes THOR-05F as a more realistic representation of a small female occupant during frontal crashes. Its improved instrumentation is particularly relevant for studying chest deformation and forces affecting the lower body. The agency also continues developing WorldSID-05F, an advanced female dummy intended for side-impact research. Together, these tools could help engineers evaluate injuries that conventional models have struggled to explain.
An important distinction remains between developing a dummy and requiring its use in official tests. As of October 2026, THOR-05F had not been fully standardized and incorporated into the federal regulatory framework. An August 2026 Federal Register notice confirmed that additional work on injury criteria and regulatory adoption was still necessary. Manufacturers can use the published technical specifications for development and research, but the new model has not automatically replaced older dummies in every federal crash-test procedure.
What Better Testing Means for Everyday Drivers
Consumers cannot determine a vehicle’s safety simply by checking whether its manufacturer uses a particular dummy. Modern vehicles already offer substantial protection through stronger passenger compartments, improved restraint systems and advanced airbags. NHTSA research found that the relative fatality-risk difference between female and male front-row occupants declined from an estimated 18.3 percent in older vehicle model years to 6.3 percent in vehicles from the 2010–2020 model years.
When choosing a car, drivers can still take practical precautions. Comparing established safety ratings is useful, but seat-belt fit and driving position deserve attention during a test drive. The lap belt should rest across the hips rather than the abdomen, while the shoulder belt should cross the middle of the chest without pressing against the neck. Drivers should also be able to reach the pedals comfortably without sitting unnecessarily close to the steering wheel.
The larger responsibility belongs to vehicle manufacturers, researchers and safety regulators. More representative testing can help identify weaknesses before a vehicle reaches the road, especially when it combines advanced dummies with real-world collision data and computer simulations. The goal is not to develop a single perfect model of a woman’s body. It is to test vehicles against a wider range of human characteristics so that safety improvements protect people whose bodies were historically underrepresented in the laboratory.