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Difficulty: MediumBlood Alcohol Concentration (BAC) Limits and Thresholds

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

  • Standard non-commercial adult driver (aged 21 or older)0.08% BAC limit
  • Commercial motor vehicle driver operating a commercial vehicle0.04% BAC limit
  • Underage driver (under 21 years of age) under zero-tolerance regulations0.01% to 0.02% (Zero Tolerance) BAC limit

Answer

Standard non-commercial adult drivers match with the 0.08% limit; commercial vehicle drivers match with the 0.04% limit; and drivers under age 21 match with the 0.01% to 0.02% zero-tolerance limit.
Standard non-commercial adult drivers are legally impaired at 0.08% BAC, commercial operators face a stricter limit of 0.04% BAC, and underage drivers are governed by zero-tolerance laws setting limits at 0.01% to 0.02% BAC.

Step-by-Step Solution

1
Determine the statutory threshold for adult non-commercial drivers.
The standard adult limit is 0.08% BAC.
Under standard traffic regulations, operating a non-commercial motor vehicle with a BAC of 0.08% or higher is illegal for adults 21 and older.
2
Determine the statutory threshold for commercial driver's license (CDL) holders.
The commercial limit is 0.04% BAC.
Because commercial vehicles pose greater safety risks due to size and weight, regulations enforce a lower impairment limit of 0.04%.
3
Determine the statutory threshold for drivers under the legal drinking age of 21.
Underage drivers are subject to zero-tolerance limits (0.01% to 0.02% BAC).
Zero-tolerance legislation prohibits underage individuals from driving after consuming almost any measurable amount of alcohol.

Key Concept

Statutory Blood Alcohol Concentration (BAC) Limits Across Driver Categories
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Topics

Blood Alcohol Concentration (BAC) Limits and Thresholds

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