| Domain | Alcohol Effect | Driving Consequence |
|---|
| Executive Function | Prefrontal cortex depression → poor judgment, risk underestimation, impulsivity | Speeding, tailgating, unsafe passing, ignoring signals |
| Visual Processing | Reduced acuity, contrast sensitivity, peripheral vision, glare recovery; nystagmus | Missed hazards, poor lane tracking, difficulty at night |
| Psychomotor / Reaction Time | Slowed information processing, delayed brake response, impaired coordination | Longer stopping distance, failure to avoid sudden obstacles |
| Vigilance / Attention | Drowsiness, reduced divided attention, microsleeps | Drifting, missed exits, failure to react to traffic changes |
| Mood / Behavior | Disinhibition, aggression, overconfidence | Road rage, deliberate risk-taking, passenger conflict |
Passenger-Specific Risks
- Impaired ability to assist driver (navigate, monitor).
- Increased likelihood of distracting driver.
- Reduced self-protection (seatbelt use, brace position).
- Vomiting/aspiration risk in unconscious passenger.
- Aggression/conflict in confined space.
Synergistic Risks
- Alcohol + Sleep Deprivation: Multiplicative impairment.
- Alcohol + Medications (sedatives, antihistamines): Additive CNS depression.
- Alcohol + Night Driving: Glare recovery + darkness = severe visual deficit.
Legal & Epidemiological Context
- US: 0.08% BAC per se limit (0.04% commercial, 0.02% <21).
- ~30% of traffic fatalities involve alcohol-impaired drivers (NHTSA).
- Risk rises exponentially with BAC: 0.05% → 1.4x crash risk; 0.08% → 4x; 0.15% → 12x.
Bottom Line
Alcohol degrades every skill required for safe vehicle occupancy. Zero alcohol is the only safe level for driving.
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