Question

Difficulty: EasyBlood Alcohol Concentration (BAC) Limits and Thresholds

Which statutory Blood Alcohol Concentration (BAC) limit corresponds to each driver classification under standard traffic safety laws? Match each driver category on the left with its legal threshold on the right.

  • Standard adult driver (age 21 or older operating a non-commercial vehicle)0.08% BAC per se legal limit
  • Commercial driver license (CDL) holder operating a commercial vehicle0.04% BAC per se legal limit
  • Underage driver (under age 21)0.01% to 0.02% Zero Tolerance legal limit

Answer

Standard adult drivers correspond to the 0.08% BAC limit, commercial vehicle operators correspond to the 0.04% BAC limit, and underage drivers correspond to the 0.01% to 0.02% zero tolerance threshold.
Each classification accurately reflects state and federal traffic safety laws: standard adult non-commercial drivers have a 0.08% BAC threshold, commercial drivers operating commercial vehicles have a 0.04% BAC threshold, and underage drivers under 21 are subject to a zero tolerance threshold of 0.01% to 0.02% BAC.

Step-by-Step Solution

1
Determine the legal BAC limit for standard adult drivers (age 21+).
Standard adult non-commercial drivers have a legal BAC threshold of 0.08%.
Standard motor vehicle statutes define per se driving under the influence at 0.08% BAC for adult drivers.
2
Determine the legal BAC limit for commercial vehicle operators.
Commercial vehicle drivers have a legal BAC threshold of 0.04%.
Due to increased public safety risks, commercial operators are subject to a stricter threshold of 0.04% BAC.
3
Determine the legal BAC limit for drivers under age 21.
Underage drivers are governed by zero tolerance thresholds of 0.01% to 0.02% BAC.
Zero tolerance statutes make it illegal for underage drivers to operate vehicles with any measurable amount of alcohol.

Key Concept

Specific statutory Blood Alcohol Concentration (BAC) limits apply based on driver age and vehicle classification.
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