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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 />Type of Collision <br />Kittitas County <br />All Counties -Co. <br />Maintained Roads <br />AD Public 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 <br />5 <br />16.70% <br />670 <br />24.70% <br />2,538 <br />21.10% <br />Number of Serious Injury Collisions <br />17 <br />83.30% <br />2,044 <br />75.30% <br />9,470 <br />78.90% <br />Number of Alcohol -Related Collisions <br />9 <br />37.50% <br />674 <br />24.80% <br />2,594 <br />21.60% <br />Total Number of Fatalities <br />5 <br />- <br />704 <br />- <br />2,730 <br />- <br />Total Number of Collisions* <br />650 <br />- <br />73,172 <br />- <br />588,324 <br />- <br />Total Number of injuries** <br />232 <br />- <br />32,694 <br />- <br />240,286 <br />- <br />*includes fatal and non-fatal colllsions <br />*"includes 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 41.7% 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 31-lorizontalIVertical 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 79.2% 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 />