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Cannabis and Driving in Wisconsin — CrossroadsWI Knowledge Base
How THC and cannabis affect driving ability, Wisconsin OWI laws for drug impairment, and why driving high is never safe.
Cannabis impairs driving
THC affects reaction time, coordination, judgment, and attention — all critical for safe driving. Wisconsin crash data documents alcohol and drug involvement in impaired driving crashes.
OWI includes drugs
Wisconsin OWI law covers impairment from alcohol, illegal drugs, prescription medications, and other substances. You can be charged with OWI even if your BAC is below 0.08% if you are impaired.
No safe amount for driving
There is no established “safe” level of cannabis for operating a vehicle. If you use cannabis, do not drive — plan a sober ride or stay where you are.
Official sources
WisDOT impaired driving education and crash statistics are the authoritative starting point for Wisconsin-specific information. See our Sources page for direct links.
Educational only
This article does not constitute legal or medical advice. Laws and enforcement evolve — verify current information with official Wisconsin sources.