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Kiftitas County All Counties-Co. <br />Maintained Roads <br />All Public Roads <br />(Washington State) <br />Type of Collision 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 5 16.700/o 670 24.700/o 2,538 21.10% <br />Number of Serious lnjury Collisions 17 83.30%2,044 75.30T0 9,470 78.900/o <br />Number of Alcohol-Related Collisions I 37.500/o 674 24.80Y0 2,594 21.600/o <br />Total Number of Fatalities 5 704 2,730 <br />Total Number of Collisions*650 73,172 588,324 <br />Total Number of lnjuries**232 32,694 240,286 <br />Table 1. Types of collisions, number of crashes and percent of crashes for Kiftitas County, all counties-county maintained roads, <br />and all public roads. <br />*lncludes fatal and nonJatal col <br />**lncludes serious and non-serious collisions <br />The 2015 - 2019 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 41.70/o of all fatal and serious injury collisions, <br />Additionally, 25,0% of the fatal and serious injury collisions were caused by vehicles overturning. Unprotected <br />roadside slopes steeper than 3Horizontal:lVertical are considered non-traversable 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 79,2o/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 />5