Overview
- For experienced adult motorists, the legal limit is 0.8 g/L of alcohol in blood or 0.40 mg/L in exhaled air, as determined by breathalyzer testing.
- Drivers aged 18 to 21 or with limited driving experience face a lower cap of 0.4 g/L in blood or 0.20 mg/L in air.
- Public and heavy-vehicle operators must observe zero tolerance, with sanctions in Mexico City that can include fines, license-point reductions, towing and impound fees, and up to 36 hours of arrest.
- Guides translate these thresholds to rough equivalents such as about one beer, one shot, or one glass of wine for adults, but individual factors mean even one or two drinks can approach or exceed the limit.
- Authorities are reinforcing Conduce sin alcohol checkpoints during December and advise not driving after any alcohol despite online calculators or rules of thumb.