What’s UP with County Roads?

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Presentation transcript:

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

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.

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?

A Look at the Data: Fatal Crashes

Another Look: Serious Injury Crashes

Fatal Crash Changes By Road Class

Serious-injury Crash Changes By Road Class

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

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

Fatal Crash Factors

Impaired Driving-involved

Alcohol Impaired Driver-involved

Drug Positive Driver-involved

Cannabis Positive Driver-involved

Lane Departure-involved

Intersection-involved

Speeding Driver-involved

16-25 Year-old Driver-involved

Distracted Driver-involved

Unlicensed Driver-involved

Motorcycle-involved

Unrestrained PV Occupant Fatality-involved

Pedestrian-involved

Serious-injury Crash Factors

Impaired Driver-involved

Alcohol Impaired Driver-involved

Drug Impaired Driver-involved

Speeding Driver-involved

Lane Departure-involved

Intersection-involved

Distracted Driver-involved

16-25 Year-old Driver-involved

Motorcycle-Involved

Pedestrian-involved

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

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