This multidisciplinary in-depth investigation of accidents using 24 occupants with neck symptoms shows the complexity of Whiplash Associated Disorders (WAD) in frontal impacts with respect to factors that influence occurrence as well as duration of symptoms. Two cases of unbelted occupants with a neck compression mechanism far from conventional “whiplash” motion were found. Posture related, as well as physical and psychosocial factors such as strong negative reactions, bad prognosis expectation and stressed daily activities influenced the duration of symptoms. Occupant characteristics as well as sitting posture and behaviour at the time of impact are important factors when analysing and understanding WAD.