To report a drunk driver, call 911 as soon as you can do so safely and tell the dispatcher where the vehicle is, which direction it’s heading, what it looks like, and exactly what you’ve seen it do. That single call is the fastest way to get an impaired driver stopped. Alcohol-impaired driving killed 12,429 people in 2023, and bystander reports are one of the most reliable ways police intercept a dangerous driver before a crash.1National Highway Traffic Safety Administration. 2023 Data: Alcohol-Impaired Driving
Signs That Justify the Call
You don’t need to be certain someone is drunk. You need a sustained pattern of driving that a sober person wouldn’t produce. NHTSA research identified 24 behaviors that reliably predict impairment, and even one or two of them, seen consistently, is enough to justify picking up the phone.2National Highway Traffic Safety Administration. The Visual Detection of DWI Motorists
The clearest signs involve how the vehicle sits in its lane. Weaving inside the lane, drifting toward the shoulder or center line, straddling the lane markings, nearly clipping parked cars or curbs, and taking wide, sweeping turns through intersections all point to an impaired driver.
Speed and braking are the next tier. Sudden acceleration or braking with nothing to react to, driving well under the limit, and jerky or late stops at signs and signals are common cues.
Attention lapses show up as headlights off after dark, wrong-way travel, slow starts at green lights, and stopping in a live traffic lane for no reason. Judgment problems round out the list: tailgating, unsafe lane changes, illegal turns, and driving on the shoulder.3National Highway Traffic Safety Administration. DWI Detection and Standardized Field Sobriety Test Participant Manual
Staying Safe While You Observe
Your safety comes before the call. Impaired drivers brake without warning, drift into adjacent lanes, and react unpredictably to anything around them. Do not try to stop, block, or confront the vehicle.
- Drop back and give the vehicle plenty of space. Distance protects you if the driver swerves or brakes suddenly.
- Don’t pass. Pulling alongside puts you in the path of a vehicle that may drift.
- If you can’t handle the phone and drive safely at the same time, pull over first, then call. A short delay with clear details is better than a distracted-driving crash of your own.
- Skip the flashing lights, honking, and any attempt to box the driver in. None of it helps, and all of it creates a new hazard.
What to Tell the Dispatcher
The dispatcher needs enough information to send officers to the right place and give them grounds to make a stop. Have these details ready before you dial if you can.
- Location and direction. Road name or highway number, nearest cross street or mile marker, and which way the vehicle is heading. “Northbound on I-95 just past Exit 12” is far more useful than “on the highway.”
- Vehicle description. Color, make, model, and license plate if you can read it safely. A partial plate is still worth reporting.
- What you saw. Describe the actual behavior: weaving across lanes, running a red light, driving without headlights. Specific observations give officers a legal basis to initiate a stop.
- Timing. When you first noticed the vehicle and how long you’ve been watching it.
The dispatcher will ask for your name and phone number. You aren’t required to give them in every jurisdiction, but doing so lets officers reach you later if they need a witness statement. Stay on the line until the dispatcher tells you they have what they need.4National Highway Traffic Safety Administration. Drunk Driving – Statistics and Resources
When 911 Isn’t the Right Channel
For a driver currently on the road, 911 is always the right call. Other channels exist for less urgent situations.
State Highway Patrol Shortcuts
Many states operate short codes that route directly to the state highway patrol, such as *FHP or *CSP. The number varies by state. Check your state’s highway patrol or department of transportation website and save the number in your phone before you need it.
Anonymous Tip Lines
If you’re worried about being identified, most areas have anonymous tip programs, often run through Crime Stoppers, that pass information to police without attaching your name. These fit better for reporting someone you know drives impaired regularly than for an in-progress emergency.
Online and App Reports
Some police departments accept reports through their websites or apps. These are useful for documenting something you saw earlier, but they won’t produce an immediate response. If the driver is still on the road, call.
What Happens After You Hang Up
Officers sent to your report look for the vehicle you described and watch for any driving cues themselves. Your report combined with what the officer personally observes gives the reasonable suspicion needed for a traffic stop. At the window, the officer looks for the smell of alcohol, slurred speech, bloodshot eyes, and fumbling with a license.
If impairment seems likely, the officer runs Standardized Field Sobriety Tests: the horizontal gaze nystagmus test, the walk-and-turn, and the one-leg stand.3National Highway Traffic Safety Administration. DWI Detection and Standardized Field Sobriety Test Participant Manual If the officer establishes probable cause, the driver is arrested and taken for formal breath, blood, or urine testing. Every state’s implied consent law means holding a driver’s license already counts as agreeing to that test after a lawful arrest, and refusing carries its own automatic license suspension.
If You’re Called as a Witness
Most people who report a drunk driver never see a courtroom. If your observations were the primary basis for the stop, though, you may be asked to give a statement or testify.
Your testimony will focus on what you saw: the specific lane departures, near-misses, or traffic violations you described on the call. Accuracy matters more than completeness. An honest “I don’t recall” is worth more than a filled-in detail you’re not sure about, and overstating what you saw damages credibility fast.
Good-Faith Protection and False Reports
Most states shield people who report suspected crimes in good faith from civil liability. If you genuinely believed the driver was impaired based on what you observed, the accused driver cannot successfully sue you even if the charges are later dropped.
That protection does not extend to reports you know are false. Knowingly filing a false police report is a criminal offense in every state, usually a misdemeanor carrying fines and possible jail time, and can rise to a felony in some jurisdictions. The line the law draws is between being wrong and being dishonest. A report that turns out to be mistaken is not a false report; a report you knew was untrue when you made it is.