If you’ve wondered how to tell if a driver is impaired, this guide helps parents spot common warning signs of drunk or drug-impaired driving and know what to do next to stay safe on the road.
Answer a few questions to get personalized guidance on recognizing impaired drivers while driving, understanding what an impaired driver may look like, and responding calmly and safely.
Parents often want practical ways to protect themselves and their teens on the road. Knowing the signs of an impaired driver can help you create distance early, avoid risky situations, and model safer driving habits for young passengers. Impairment can come from alcohol, drugs, or a combination of substances, and the driving behavior may be subtle at first. Learning what to watch for can make it easier to respond quickly without panic.
A driver who swerves, crosses lane lines, rides the center line, or has trouble staying in one lane may be under the influence.
Driving much too slowly, suddenly speeding up, braking for no clear reason, or changing speed erratically can be a sign of impairment.
Missing traffic signals, responding late to lights, making very wide turns, or stopping in unusual places may suggest slowed judgment or attention.
You may notice the vehicle hugging one side of the lane, nearly hitting curbs, or drifting toward other cars without correcting smoothly.
Unsafe passing, driving without headlights at night, tailgating, or turning from the wrong lane can point to impaired judgment.
A driver who almost hits objects, then jerks the wheel sharply, may be struggling with coordination and awareness.
If you think a driver is under the influence, focus first on safety. Do not try to pass aggressively, follow closely, or confront the driver. Slow down, create space, and if needed, take the next safe turn or exit. If the danger is immediate, pull over in a safe place and contact local authorities with the vehicle description, location, and direction of travel. For parents, this is also a valuable chance to talk with teens about recognizing risky driving behavior and making calm, protective choices.
During everyday drives, point out safe versus unsafe driving patterns so teens learn how to identify warning signs without becoming distracted.
Talk through what your teen should do if they notice signs of drunk driving, including slowing down, changing routes, and calling for help if needed.
Teens are more likely to act safely when they know the goal is distance and protection, not proving a point or reacting emotionally.
Common signs include weaving, drifting between lanes, sudden braking, very slow or erratic speeds, wide turns, delayed reactions to traffic signals, and driving without headlights at night.
Distracted driving can look similar, but impairment often shows up as repeated poor control, inconsistent speed, confusion at signals, overcorrections, and multiple unsafe decisions in a short period of time.
Keep your distance, avoid passing if it feels unsafe, move away from the vehicle when possible, and pull over to a safe location if needed. If there is immediate danger, contact local authorities and share the vehicle details and location.
Use simple, practical language. Explain that an impaired driver may have trouble staying in a lane, judging speed, reacting to lights, or making safe decisions. Emphasize that the safest response is to create space and get help if necessary.
Answer a few questions to assess how confident you feel, learn the warning signs of an impaired driver, and get clear next-step guidance you can use for yourself and your teen.
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