WTSC - Traffic Safety Statewide Survey - 2023 - Methodological Plan - v1 Washington Traffic Safety Commission (WTSC) Washington Impaired Driving Advisory Council (WIDAC) Source https://wtsc.wa.gov/...ntent/uploads/2023/10/2023-Survey-Methodological-Plan.pdf Replications Cannabis Observer Information Set Membership WTSC - Traffic Safety Statewide Survey - 2023