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Table 1, Types of collisions, number of crashes and percentage of crashes for Kittitas County, all counties- <br />county maintained roads, and all public roads. <br />*lncludes fatal and non-fatal <br />**lncludes serious and non-serious. <br />The 2019 - 2023 WSDOT provided collision data was further evaluated to determine the predominant crash <br />types, contributing factors, and specific locations. As shown in Table 2 below, the predominant causes of <br />fatal and serious injury collisions in Kittitas County are "hitting a fixed object" and "overturning," Crashes <br />involving fixed-object hazards, or non-traversable roadside slopes within clear zone accounted for 62.07Y0 <br />of all fatal and serious injury collisions. Additionally, 13.790/o of the fatal and serious injury collisions were <br />caused by vehicles overturning, Unprotected roadside slopes steeper than 3Horizontal:lVertical are <br />considered non-traversable and contribute to overturning accidents, The predominant conditions where <br />fatal and serious injury collisions occurred included higher speed roadways with low lighting conditions, and <br />where roadway curvature was a factor. This accident data seems consistent for a county like Kittitas where <br />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 <br />acuity, especially in horizontal curves where drivers are more likely to leave the roadway, Non-intersection <br />related collisions accounted for 68.97% of the fatal and serious injury collisions, although a large proportion <br />of total accidents (non-injury, serious injury, and fatal) occurred at intersections and main corridors leading <br />to potential for more serious accidents at these locations, For the fatal and serious injury collisions accident <br />report details please see Appendix A. <br />6 <br />Type of Collision <br />Kittitas County All Counties-Co. <br />Maintained Roads <br />AllPublic Roads <br />(Washington State) <br />Number <br />of <br />Crashes <br />Percent <br />of <br />Crashes <br />Number <br />of <br />Crashes <br />Percent <br />of <br />Crashes <br />Number <br />of <br />Crashes <br />Percent <br />of <br />Crashes <br />Number of Fatal Collisions 6 21Yo 802 23.800/o 3,070 19.87Yo <br />Number of Serious lnjury <br />Collisions <br />23 79%2,760 76.200/o 12,378 80,13% <br />Number of Alcohol-Related <br />Collisions <br />8 28Yo 557 20.20o/o 2,544 16.47o/o <br />Total Number of Fatalities 7 24Yo 847 23.780/o 3,317 21.47T0 <br />Total Number of Collisions*647 65,814 509,329 <br />Total Number of lniuries**213 22,112 150,739