Difficulty paying attention
Difficulty staying in traffic lane
Slower reaction times
Difficulty judging distances
Reduced peripheral vision
A Worrying Trend in Washington State
8% in 2013
17% in 2014
After legalization, the proportion of fatal crashes that involved marijuana more than doubled.
While the data analyzed for the study did not include enough information to determine which driver was at fault in a given crash, the trend is troubling because the proportion of fatal crashes involving marijuana in Washington had been relatively stable between 2010 and 2013.
Determining Impairment Isn’t Easy
1 “Trends in alcohol and other drugs detected in fatally injured drivers,” Brady, 2014.
2 “Acute cannabis consumption and motor vehicle collision risk,” Asbridge, Hayden, and Cartwright, 2013.
3 “Cannabis effects on driving skills,” Hartman and Heustis, 2013.
Information taken from “Fatal Road Crashes Involving Marijuana Double After State Legalizes Drug,” May 10, 2016, AAA Foundation for Traffic Safety.