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Table 1. Types of collisions, number of crashes and percent of crashes for Kittitas County, all counties-county maintained roads, <br />and all public roads. <br />*lncludes fatal and non-fatal <br />*lncludes serious and non-serious. <br />The 2017 - 2021 WSDOT provided collision data was further evaluated to determine the predominant crash types, <br />contributing factors, and specific locations, As shown in Table 2 below, the predominant causes of fatal and serious <br />injury collisions in Kittitas County are "hitting a fixed object" and "overturning." Crashes involving fixed-object hazards, <br />or non-traversable roadside slopes within clear zone accounted for 44.800/o of allfatal and serious injury collisions, <br />Additionally, 20.700/0 of the fatal and serious injury collisions were caused by vehicles overturning. Unprotected <br />roadside slopes steeper than 3Horizontal:lVertical are considered non{raversable and contribute to overturning <br />accidents. The predominant conditions where fatal and serious injury collisions occurred included higher speed <br />roadways with low lighting conditions, and where roadway curvature was a factor, This accident data seems <br />consistent for a county like Kittitas where most of the roadway network is rural without lighting features. <br />Accidents tend to be more severe when speeds are higher and where low light conditions hinder driver acuity, <br />especially in horizontal curves where drivers are more likely to leave the roadway. Non-intersection related collisions <br />accounted for 72.400/o of the fatal and serious injury collisions, although a large proportion of total accidents (non- <br />injury, serious injury, and fatal) occurred at intersections and main corridors leading to potential for more serious <br />accidents at these locations. For the fatal and serious injury collisions accident report details please see Appendix A, <br />6 <br />Type of Collision <br />Kittitas County AllCounties-Co. <br />Maintained Roads <br />AllPuhlic Roads <br />(Washington State) <br />Number of <br />Grashes <br />Percent of <br />Crashes <br />Number of <br />Grashes <br />Percent of <br />Crashes <br />Number of <br />Crashes <br />Percent of <br />Grashes <br />Number of Fatal Collisions 4 13.80%696 23.80Yo 2,655 20.300/0 <br />Number of Serious lniury Colllsions 25 86.200/o 2,232 76.20%10,396 79.70T0 <br />Number of Alcohol-Related Collisions B 27.600/0 591 20.200/o 2,723 20.90Vo <br />Total Number of Fatalities 4 729 2,863 <br />Total Number of Collisions*654 69,1 98 538,366 <br />Total Number of lniuries**245 30,1 00 212,646