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Alcohol can impair visual tracking, divided attention, information processing and muscle coordination, so a driver may notice a hazard later and then take longer to respond. These effects can begin at low blood alcohol concentrations (BAC); a legal limit is not a guarantee that someone is safe to drive.
How does alcohol affect a driver’s reaction time?
Driving requires more than a quick reflex. A driver must spot relevant information, interpret it, decide what to do and control the vehicle. Alcohol can affect several of those functions at once. NHTSA describes alcohol as reducing brain function and impairing thinking, reasoning and muscle coordination. Its driving-effects table includes changes to visual tracking, divided attention, information processing, perception, reaction time and vehicle control.
If a driver tracks a moving object less effectively or has difficulty searching for signals, a hazard may be recognized later. Slower information processing and reaction can then leave less time to brake or steer. This describes how the affected functions can compound one another; it is not a single measured delay that applies to every driver. The sources do not establish one general number of milliseconds by which alcohol slows reaction time.
How does alcohol affect vision while driving?
Alcohol can make it harder to focus the eyes, track moving objects and divide attention between tasks. Those abilities matter when monitoring traffic, checking mirrors, reading signals and responding to a changing road scene. NHTSA also identifies impaired visual search and signal detection among the effects associated with higher BAC levels.
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The driving effects NHTSA lists by BAC are typical effects, not a personal diagnostic chart. A person’s BAC row does not predict precisely what that individual can or cannot do, and being below a listed level does not establish that driving is safe.
| BAC (g/dL) | Typical effects NHTSA lists that relate to vision, reaction or control |
|---|---|
| .02 | Decline in rapid tracking of a moving target and in the ability to perform two tasks at once (divided attention). |
| .05 | Small-muscle control such as focusing the eyes may be affected; coordination and tracking moving objects are reduced, steering may be harder, and response to emergency driving situations may decline. |
| .08 | Poor muscle coordination, including vision and reaction time; danger may be harder to detect; information processing such as signal detection and visual search is reduced; perception is impaired. |
| .10 | Reaction time and control deteriorate; maintaining lane position and braking appropriately become more difficult. |
| .15 | Substantial impairment in vehicle control, attention to driving, and visual and auditory information processing. |
These are NHTSA’s typical and predictable driving effects, not thresholds below which a driver is unimpaired. NHTSA says even a small amount of alcohol can affect driving ability. A 1988 NHTSA review by Herb Moskowitz and Christopher D. Robinson reported evidence of impairment at BACs of .05 g/dL and higher across driving-related skills, with some functional effects at .02 or .03; it concluded that zero is the only safe BAC limit for driving-related skills. That review is dated evidence, not a new study.
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Is the legal BAC limit a safe level for driving?
No. A per se legal limit is a jurisdiction’s legal standard, not a physiological safety threshold. In the United States, NHTSA says the per se limit is .08 g/dL in all 50 states, Washington, D.C., and Puerto Rico, except Utah, where it is .05 g/dL. These are US-specific limits; laws elsewhere may differ. Impairment can affect driving before a person reaches a per se limit.
What to do after drinking
Do not drive after drinking. Arrange a designated driver or another sober ride instead of relying on how you feel. A breathalyzer measures BAC, but the cited guidance does not establish that a consumer reading certifies that someone is safe to drive. Eyewear, coffee, reaction-time apps and self-assessments do not clear a person to drive or reverse alcohol-related impairment.
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The scale of alcohol-impaired driving deaths
NHTSA reports 11,904 deaths from drunk-driving crashes in 2024—about 32 people per day, or one every 44 minutes—under its stated definition. Separately, CDC reports that 13,524 people were killed in motor vehicle crashes involving alcohol-impaired drivers in 2022, representing 32% of all traffic-related deaths that year. These are figures from different years and agency presentations, so they should not be treated as a directly comparable trend.
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Sources
- NHTSA, Drunk Driving: Statistics and Resources
- CDC, Impaired Driving
- NHTSA, Effects of Low Doses of Alcohol on Driving Related Skills: A Review of the Evidence, DOT HS 807 280 (July 1988)
- NHTSA, Alcohol and Driving
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