How high is too high to drive? Cannabis impairment facts.

CDOT releases updated safe-driving educational materials

How high is too high to drive? How long does weed stay in your system? Are cannabis-impaired DUIs even real?

Get the answers to your cannabis-impaired driving questions and the latest data from our fact sheets below — or on our FAQ page. From cannabis use to DUI laws and the dangers of driving high — we have the facts.

Our goal is to educate Coloradans about cannabis-impaired driving and keep Colorado roadways safe. This begins with accurate and trusted information. Remember that driving high is always dangerous and illegal — plan ahead and know the facts.

Here are short answers to common questions:

  • How high is too high to drive?
    • Any level of impairment can put you at risk of a DUI. Remember, if you feel different, you drive different. Why take the risk?
  • Is driving high illegal?
    • Yes, you can get a DUI for cannabis just like with alcohol.
  • How long should I wait to drive?
    • CDPHE recommendations and academic research say from 4-8 hours depending on what you’ve consumed and how much.
  • Why is driving high illegal and dangerous?
    • Cannabis affects reaction time, judgment and your ability to multitask (important for safe driving).
  • Can you get a DUI if you’re not high but have THC in your system?
    • Impairment is caused by active Delta-9 THC (and Delta-8/Delta-10 and other psychoactive cannabinoids). As you sober up, it is converted to inactive THC, which can stay in your system up to a month. So even if you have inactive THC in your system but are driving sober, you are not at risk of a DUI.

We encourage you to share these materials on your social feeds, newsletters or websites. Printed educational tear-off pads are also available for use in cannabis businesses, prevention organizations and community gathering places. Order free materials here.

To get involved with the campaign, reach out to CDOT Traffic Safety Communications Manager Sam Cole at [email protected].

Visit for more news and resources on marijuana-impaired driving.