The Colorado Department of Transportation along with local law enforcement agencies are urging travelers to plan ahead to avoid driving while impaired over spring break, according to a news release.

The effects of higher altitude on the body, which include dehydration, tiring more easily and less oxygen, can potentially increase impairment, so even the moderate consumption of of cannabis or alcohol can be stronger than expected, the release states.

“A drink or edible that feels mild at sea level can have a stronger effect in the mountains,” CDOT communications manager Sam Cole said in a statement. “For spring breakers, this can lead to risky behaviors, including getting behind the wheel while impaired. We want everyone to enjoy their spring break responsibly and make smart choices.”

In 2024, there were 203 fatalities on Colorado roads that involved an impaired driver, accounting for 31% of all traffic deaths during the year, the release states. Last year, law enforcement agencies in Summit and Eagle counties arrested more than 120 people for driving under the influence between February and April, according to the news release.

“Every year, we see a spike in DUIs during spring break, many of which involve visitors who underestimate altitude’s impact on alcohol impairment and the potency of cannabis products,” Summit County Sheriff Jaime FitzSimons said in a statement. “We want everyone to stay safe while enjoying the mountains. Please plan ahead, make responsible choices, and don’t put yourself or others in danger.”