Whiplash remains a major concern following rear-end collisions, which account for 27.8% of passenger vehicle crashes. Females face greater risk of long-term cervical spine injury than males. Females have less muscle strength, more slender necks, and lower tolerance limits for lower neck shear force compared to males. Only one rear impact dummy size, the 50th percentile male, is currently available. Dynamic testing reveals differences in responses between 50th percentile female and male dummies. Whiplash mitigation requires reducing occupant acceleration, minimising relative movements between vertebrae, and minimising forward rebound. The seat must be considered as a system; focusing on one component alone is inadequate. Preparation for a future 50th percentile female rear impact dummy is recommended, with new injury thresholds established.

Whiplash injury causes neck pain, stiffness, headache, shoulder pain, and neurological symptoms, with women more sensitive than men. Symptoms occur consistently across rear, frontal, and lateral impacts. Research focuses on nerve injury in spinal ganglia as the injury site, as this explains why long term whiplash symptoms include neurological symptoms independent of crash direction. The Neck Injury Criterion (NIC) measures injury using the formula NIC = 0.2Δa + Δv², where Δa is acceleration difference and Δv is velocity difference. Whiplash motion causes rapid volume changes inside the vertebral canal, with epidural blood volume pumped to compensate. Animal experiments using pressure sensors show pressure changes in skull and spine at different vertebral levels during whiplash events.