Drug-Impaired Driving

Overview

You can’t drive safely if you’re impaired. That’s why it’s illegal everywhere in America to drive under the influence of alcohol, marijuana, opioids, methamphetamines, or any potentially impairing drug–prescribed or over the counter. Driving while impaired by any substance—legal or illegal—puts you and others in harm’s way. Learn the latest research on drug-impaired driving, misconceptions about marijuana use, and what you can do to make smarter choices to drive safely.

The Issue

Many Substances Can Impair Driving

Related Resources NHTSA Public Meetings - Dialogue on Drug-Impaired Driving Drug-Impaired Listening Sessions

Many substances can impair driving, including alcohol, some over-the-counter and prescription drugs, and illegal drugs.

  • Alcohol, marijuana, and other drugs impair the ability to drive because they slow coordination, judgment, and reaction times.
  • Cocaine and methamphetamine can make drivers more aggressive and reckless.
  • Using two or more drugs at the same time, including alcohol, can amplify the impairing effects of each drug a person has consumed.
  • Some prescription and over-the-counter medicines can cause extreme drowsiness, dizziness, and other side effects. Read and follow all warning labels before driving, and note that warnings against “operating heavy machinery” include driving a vehicle.

Impaired drivers can’t accurately assess their own impairment – which is why no one should drive after using any impairing substances. Remember: If you feel different, you drive different.

Presidential Proclamation

December 2018 is National Impaired Driving Prevention Month.

The Issue

Marijuana Impairs

Related Topic

There are many misconceptions about marijuana use, including rumors that marijuana can’t impair you or that marijuana use can actually make you a safer driver.

Several scientific studies indicate that this is false. Research shows that marijuana impairs motor skills, lane tracking and cognitive functions (Robbe et al., 1993; Moskowitz, 1995; Hartman & Huestis, 2013). A 2015 study on driving after smoking cannabis stated that THC in marijuana also hurts a driver’s ability to multitask, a critical skill needed behind the wheel. 

NHTSA continues to conduct research to better understand the relationship between marijuana impairment and increased crash risk. NHTSA’s Drug and Alcohol Crash Risk Study found that marijuana users are more likely to be involved in crashes. However, the increased risk may be due in part because marijuana users are more likely to be young men, who are generally at a higher risk of crashes. 

While evidence shows that drug-impaired driving is dangerous, we still have more to learn about the extent of the problem and how best to address it. In January 2018, NHTSA launched a new initiative to address drug-impaired driving. NHTSA’s National Drug-Impaired Driving Initiative brings together experts, including law enforcement officials, prosecutors, substance abuse experts and others, to discuss strategies that can reduce drug-impaired driving.

The Issue

It’s Illegal

Driving impaired by any substance—alcohol or drugs, whether legal or illegal—is against the law in all 50 states and the District of Columbia. Law enforcement officers are trained to observe drivers’ behavior and to identify impaired drivers. Even in states that have legalized the use of marijuana, it is still illegal to drive under the influence of the drug.

NHTSA’s National Roadside Survey conducted in 2013-2014 found that 20 percent of surveyed drivers tested positive for potentially impairing drugs.

Surveys conducted by NHTSA show the number of drivers testing positive for marijuana increased between 2007 and 2014. In 2007, NHTSA’s National Roadside Survey found that 8.6 percent of weekend nighttime drivers tested positive for marijuana. In the 2013-2014 survey, 12.6 percent of weekend nighttime drivers tested positive for marijuana. That’s a 48-percent increase in less than 10 years.

While the presence of a drug in a driver’s system doesn’t necessarily mean that they’re impaired, these findings show the importance of raising awareness about the risks of drug-impaired driving.

The Issue

Responsible Behavior

We can all save lives by making smarter choices.

  • If you use an impairing drug, designate a sober driver, call a cab, or use a ride-hailing service.
  • Don’t let friends get behind the wheel if they’re under the influence of drugs or alcohol.
  • Download NHTSA’s SaferRide app from Google Play or the iTunes Store to help you call a friend or taxi, pinpoint your location, and arrange to be picked up.
  • If you’re hosting a party where alcohol or other substances will be used, it’s your job to make sure all guests leave with a sober driver.
  • Always wear your seat belt—it’s your best defense against impaired drivers.
NHTSA In Action

NHTSA’s National Drug-Impaired Driving Initiative

In 2018, NHTSA launched its If You Feel Different, You Drive Different campaign to educate Americans about the dangers of driving while impaired by drugs, and to promote safer choices. Any time you consume a substance that makes you feel different, you aren’t safe to drive. Impaired driving isn’t a mistake; it’s a crime. 

Those who drive under the influence of alcohol or drugs, whether obtained legally or illegally, pose a danger to themselves, their passengers, and other road users. 

NHTSA is determined to put an end to impaired driving—to save lives. Remember: Impairment is impairment, no matter the substance.

Resources

Resources

Search for more resources

127 Results
Title Type Audience Date Language
 
Thanksgiving Travel Advisory: Drive Safely and Make It to the Table
Press Release 11/16/2018
NHTSA Advises Motorists to Drive Sober This Thanksgiving
Press Release Car Owners 11/15/2018
Impaired Driving Leadership Model: Findings Based on Three State Case Studies - Report PDF, 1.44 MB
Document 10/31/2018
Press Conference Comments on Drug-Impaired Driving
Speeches and Presentations 10/09/2018
U.S. DOT Announces 2017 Roadway Fatalities Down
Press Release 10/03/2018
Related resources for this topic