Impairment
Cannabis Involvement Among Drivers in Fatal Crashes
A two-page brief summarizing data from 2012 to present (updated as final data is released).
Published April 2023
Changing Washington’s per se blood alcohol concentration (BAC) limit from .08% to .05% BAC
A summary of information considering a lowering of the legal per se alcohol BAC limit in Washington State.
Published November 2022
Post-DUI Driver Crash Risk
A two-page summary of a literature review followed by individual article/source summaries.
Published June 2019
Marijuana Use, Alcohol Use, and Driving in Washington State: Emerging Issues with Poly-Drug Use on Washington Roadways
An in-depth report analyzing linked fatal crash and toxicology data 2008-2016, 2014-2015 roadside surveys, and self-report surveys.
Published May 2019
Mental Health and Substance Use Dual Diagnosis in Impaired Drivers
A two-page summary of a literature review followed by individual article/source summaries.
Published August 2018
Victim Impact Panels, Who Benefits and Why?
A two-page summary of a literature review followed by individual article/source summaries.
Revised February 2023
Driver Toxicology Testing and the Involvement of Marijuana in Fatal Crashes, 2010-2014: A Descriptive Report
An in-depth report describing linked fatal crash and toxicology data 2010-2014 for detailed driver marijuana results.
Revised February 2016
Distraction
King County Distracted Driving Survey Report
Results from the King County survey conducted 2018-2019 and 2021-2022 measuring behavior, acceptance, threat perception, and intentions. Includes differences over time and responses by sex and race/ethnicity.
Published April 2023
Distracted Driving Observation Survey Results
A two-page brief summarizing the results of the annual distracted driving observation survey 2019-2022.
Published October 2022
Distracted Driving in Washington State During COVID-19: 2020 Observation Survey, Enforcement, and Crashes
An in-depth report describing the impact of COVID-19 response on distracted driving in Washington state in 2020. The report summarizes new data and provides contextual explanations of changes to distracted driving behavior, enforcement of distracted driving laws, and monthly distracted driving fatal and serious injury crashes.
Published March 2021
Distracted Driving in Washington State, 2019: Crash Statistics, Enforcement, and Results from the Statewide Observation Survey
An in-depth report describing early impacts from the 2017 Driving Under the Influence of Electronics Act summarizing changes in crashes, enforcement, and driver observation surveys available through 2019.
Published March 2020
Distracted Driving in Washington State, 2016-2018: Results from the Annual Observation Surveys
An in-depth report analyzing the survey results for the state and individual counties.
Published November 2018
Seat Belts & Child Restraints
Seat Belt Use in Washington State 2022
An in-depth report analyzing the survey results for the state and individual counties.
Published February 2023
Seat Belt Use on the Colville Indian Reservation in Washington State 2019
An in-depth report analyzing the baseline and post-3 year results of the front seat occupant seat belt use observation survey.
Published November 2019
Statewide Estimates of Child Restraint Use Among Elementary Students 2014
An in-depth report analyzing the results of a school drop-off child passenger safety and restraint use observation survey.
Published August 2014
Young Drivers
Young Drivers and Brain Development
A two-page summary of a literature review followed by individual article/source summaries.
Published May 2017
Effectiveness of School-Based Programs
A two-page summary of a literature review followed by individual article/source summaries.
Published May 2014
Walkers & Bicyclists
Motorcyclists
Positive Motorcycle Behaviors in Clark County
A two-page brief summarizing officer observations of motorcyclist safety.
Published August 2020
Motorcycle Helmets: Laws, Effectiveness and Economic Benefits
A two-page summary of a literature review followed by individual article/source summaries.
Published March 2018
Motorcycle Lane Sharing
A two-page summary of a literature review followed by individual article/source summaries.
Published December 2017
General Traffic Safety
State of the State: Washington Traffic Fatalities
A four-page brief summarizing numbers and rates of fatal crashes 2020-2022.
Published May 2023
American Indian/Alaska Native (AIAN) Traffic Deaths
A two-page brief summarizing 2017-2021 AIAN traffic deaths and rates.
Published April 2023
Unlicensed Drivers on Washington Roads
A two-page brief summarizing fatal crashes from 2017-2021 involving unlicensed drivers.
Published April 2023
State of the State: Washington Traffic Fatalities
A four-page brief summarizing numbers and rates of fatal crashes 2019-2021.
Published June 2022
What if every car had automatic emergency braking?
A two-page brief summarizing 2018 crashes by AEB preventable collision-type.
Published November 2019
Do AV crash avoidance technologies keep us safe?
A two-page summary of a literature review followed by individual article/source summaries.
Published September 2019
Driving During the Day and Night, Darkness and Light
A two-page summary of a literature review followed by individual article/source summaries.
Published March 2019
Post 30-Day Mortality of Crash Serious Injuries
A two-page brief analyzing 2015-2016 linked crash-death records.
Published September 2018
WTSC Grant-Funded Research Project Reports
Executive Summary: DREs and Case Outcomes
Published September 2021
WA Graduated Driver Licensing (GDL) Program Attitude and Behavior Survey Results
Published October 2020
Measuring Current Traffic Safety Culture via Social Media Mining
Published October 2019
The Role of THC and Other Intoxicants in Fatal Crashes in Washington State
Published January 2018
