“…The third challenge is that not all of the studies include accidents as an outcome measure. Table 4 shows that nine of the studies use or include accidents as an outcome measure (e.g., [8,9,28,31,35,37,40,44]. These generally look at insurance data, focusing on all accidents (e.g., all material damage accidents, or only accidents where drivers are at fault), while the primary interest in the present study is accidents with KSI.…”