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TABLE 1 <br />2013 through 2017 Collision Comparison <br />All Counties -Co. <br />Kittitas County <br />All Public Roads <br />Maintained Roads <br />Collision Type <br />4% <br />of <br /># <br />% of <br />% of <br />#Crashes <br />Crashes <br />Crashes <br />Crashes <br />Crashes <br />Crashes <br />Fatal <br />4 <br />14.8% <br />654 <br />24.5% <br />2,402 <br />21.2% <br />Serious Injuries <br />23 <br />85.2% <br />2,020 <br />75.5% <br />8,911 <br />78.8% <br />Alcohol -Related <br />9 <br />33.3% <br />706 <br />26.4% <br />2,482 <br />21.9% <br />Total # Fatalities <br />4 <br />702 <br />2,587 <br />Total#All Injuries <br />230 <br />32,982 <br />15,651 <br />Total # All Collisions <br />630 <br />--- <br />71,219 <br />--- <br />239,597 <br />--- <br />The 2013-2017 WSDOT provided collision data was further evaluated to determine the predominant <br />crash types and contributing factors. As shown in Table 2 below, the predominant causes of fatal and <br />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 40.7% <br />of all fatal and serious injury collisions. Additionally, 29.6% of the fatal and serious injury collisions were <br />caused by vehicles overturning. Unprotected roadside slopes steeper than 3H:1V are considered non - <br />traversable and contribute to overturning accidents. The predominant conditions where fatal and <br />serious injury collisions occurred included higher speed roadways with less than desirable lighting <br />conditions and where roadway curvature was a factor. This accident data seems consistent for a county <br />like Kittitas where the majority 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 - <br />intersection related collisions accounted for 74.10% of the fatal and serious injury collisions, which is <br />also consistent with the amount of roadway lane miles versus intersections existing within the Kittitas <br />County roadway network. For the fatal and serious injury collisions accident report details please see <br />Appendix A. <br />