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Difficulty: MediumBlood Alcohol Concentration (BAC) Limits and Thresholds

Match each driver category on the left with its corresponding statutory Blood Alcohol Concentration (BAC) legal limit threshold on the right.

  • Standard non-commercial passenger vehicle driver (aged 21 or older)0.08%0.08\% BAC threshold (per se illegal limit)
  • Commercial motor vehicle operator driving a heavy truck0.04%0.04\% BAC threshold (stricter commercial safety limit)
  • Underage driver operating a private vehicle (under age 21)0.01%0.01\% to 0.02%0.02\% BAC threshold (zero-tolerance policy limit)

Answer

Standard adult non-commercial drivers correspond to 0.08%0.08\%, commercial motor vehicle operators correspond to 0.04%0.04\%, and underage drivers correspond to 0.01%0.01\%-0.02%0.02\% under zero-tolerance laws.
Each driver category maps directly to its statutory legal limit: standard adult drivers at 0.08%0.08\%, commercial vehicle operators at 0.04%0.04\%, and drivers under 21 at zero-tolerance levels (0.01%0.01\%-0.02%0.02\%).

Step-by-Step Solution

1
Identify the legal limit for non-commercial adult drivers aged 21 or older.
The established per se limit for adult passenger vehicle drivers is 0.08%0.08\% BAC.
Traffic safety law sets 0.08%0.08\% as the threshold at which an adult driver is legally presumed impaired per se.
2
Identify the statutory limit for commercial motor vehicle (CMV) operators.
The commercial vehicle BAC limit is 0.04%0.04\%.
Because commercial vehicles pose greater safety risks due to size and weight, federal regulations enforce a lower impairment limit.
3
Identify the statutory limit for drivers under the age of 21.
Underage drivers are governed by zero-tolerance thresholds (0.01%0.01\% to 0.02%0.02\% BAC).
Since consuming alcohol under age 21 is illegal, zero-tolerance laws prohibit drivers under 21 from operating a vehicle with any measurable trace of alcohol.

Key Concept

Statutory Blood Alcohol Concentration (BAC) Limits Across Driver Classifications
Estimated Time:1m 0s
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Topics

Blood Alcohol Concentration (BAC) Limits and Thresholds

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