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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 />All Counties -Co. <br />All Public Roads <br />Kittitas County <br />Maintained Roads <br />(Washington State) <br />Type of Collision <br />Number <br />Percent <br />Number <br />Percent <br />Number <br />Percent <br />of <br />of <br />of <br />of <br />of <br />of <br />Crashes <br />Crashes <br />Crashes <br />Crashes <br />Crashes <br />Crashes <br />Number of Fatal Collisions <br />6 <br />21% <br />802 <br />23.80% <br />3,070 <br />19.87% <br />Number of Serious Injury <br />23 <br />79% <br />2,760 <br />76.20% <br />12,378 <br />80.13% <br />Collisions <br />Number of Alcohol -Related <br />8 <br />28% <br />557 <br />20.20% <br />2,544 <br />16.47% <br />Collisions <br />Total Number of Fatalities <br />7 <br />24% <br />847 <br />23.78% <br />3,317 <br />21.47% <br />Total Number of Collisions* <br />647 <br />65,814 <br />509,329 <br />Total Number of Injuries** <br />213 <br />22,112 <br />1 150,739 <br />*Includes fatal and non -fatal <br />**Includes 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 62.07% <br />of all fatal and serious injury collisions. Additionally, 13.79% of the fatal and serious injury collisions were <br />caused by vehicles overturning. Unprotected roadside slopes steeper than 3Horizontal:1 Vertical 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 />