Q-Series dummies, with Abdominal Pressure Twin Sensors, have shown limited ability to discriminate differences in booster seats. This study investigated whether alternative static and/or kinematic measures could supplement the Abdominal Pressure Twin Sensors and improve the capacity of the dummy to discriminate between boosters. A series of sled experiments was carried out with Q3, Q6 and Q10 dummies. The dummies were seated directly on the test bench (with no booster) and in a range of boosters that generated different belt paths over the pelvis and different levels of belt guidance.

None of the dummies submarined when seated directly on the test bench and all regulatory test requirements were met (including abdomen pressure). The initial static belt path and knee-head excursion were both capable of discriminating differences between boosters. Furthermore, both parameters would require a booster to achieve a basic level of performance in the regulatory test. They may be useful tools, therefore, to supplement the current requirements and ensure that good restraint design principles are followed.