1. What’s UP with County Roads?
WSACE Conference
June 21, 2017
Leavenworth, WA
Dick Doane, Research Investigator
WA Traffic Safety Commission

2. Some Background
In 2015, County roads comprised nearly HALF (48.9%) of all Centerline Miles in Washington…
But they accounted for only 16.3% of statewide VMT.
By contrast, State highways made up only 8.8% of Centerline Miles but saw 55.9% of statewide VMT.

3. More Background: Crashes
Between 2005 and 2012, fatal and serious- injury crashes in WA dropped by 31% and 21%, respectively.
However, between 2013 and 2016, fatal and serious-injury crashes rose by 26% and 18%, respectively.
Question: Why?

4. A Look at the Data: Fatal Crashes

5. Another Look: Serious Injury Crashes

6. Fatal Crash Changes By Road Class

7. Serious-injury Crash Changes By Road Class

8. Fatal Crashes By Road Class 2011-13 vs 2014-16

9. Road Class in Fatal Crashes 2011-2013 vs. 2014-2016

10. Fatal Crash Factors

11. Impaired Driving-involved

12. Alcohol Impaired Driver-involved

13. Drug Positive Driver-involved

14. Cannabis Positive Driver-involved

15. Lane Departure-involved

16. Intersection-involved

17. Speeding Driver-involved

18. 16-25 Year-old Driver-involved

19. Distracted Driver-involved

20. Unlicensed Driver-involved

21. Motorcycle-involved

22. Unrestrained PV Occupant Fatality-involved

23. Pedestrian-involved

24. Serious-injury Crash Factors

25. Impaired Driver-involved

26. Alcohol Impaired Driver-involved

27. Drug Impaired Driver-involved

28. Speeding Driver-involved

29. Lane Departure-involved

30. Intersection-involved

31. Distracted Driver-involved

32. 16-25 Year-old Driver-involved

33. Motorcycle-Involved

34. Pedestrian-involved

35. So… What drove these changes?
Lower Enforcement
Driver Behaviors
Economics
Demographics

36. Dick Doane, WTSC Research Investigator ddoane@wtsc.wa.gov 360.725.9894
Thank You!
Dick Doane, WTSC Research Investigator