R.G. Smart, "Transport Related Stress" in Stress Consequences: Mental, Neuropsychological and Socioeconomic (ed. George Fink: Academic Press, 2009), p. 708: "A national study in the United States found that ... of respondents ... 1-2% had gotten out of their cars to hurt other drivers, deliberately hit other drivers, or had carried a weapon."
Alan R. Felthouse, "Personal Violence" in The American Psychiatric Publishing Textbook of Forensic Psychiatry (2d ed.: eds. Robert I. Simon & Liza H. Gold), pp. 551-52: "An automobile is a potentially lethal machine. Litigation involving psychiatrists has resulted when a hospitalized patient, after discharges, caused a two-person vehicle accident with death or injuries to one or more victims ... Such cases involve three different types of scenarios. One is the vehicular crash that results from the patient's medication-induced drowsiness at the wheel ... The second scenario is a true accident but is unrelated to any prescribed medication. Rather, the patient's driving is impaired by the disabling effects of mental illness [or] recent consumption of nonprescribed drugs or alcohol. The third situation is when the patient deliberately crashes into another vehicle. Neuropsychiatric conditions that can be associated with an increased risk of vehicular crash include psychotic exacerbation of schizophrenia, profound or suicidal depression, dementia, and disturbances in consciousness, such as epilepsy and narcolepsy."
Oakes, Charles (23 October 2014). "The Bollard: Crash- and Attack-Resistant Models". Whole Building Design Guide, National Institute of Building Sciences. Archived from the original on 7 November 2014. Retrieved 7 November 2014.
Oakes, Charles (23 October 2014). "The Bollard: Crash- and Attack-Resistant Models". Whole Building Design Guide, National Institute of Building Sciences. Archived from the original on 7 November 2014. Retrieved 7 November 2014.
