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How long must you wait to drive a commercial vehicle after using alcohol, under the basic federal prohibition?
- A.You may not drive within 4 hours after using alcohol, and may not use alcohol while on duty
- B.No wait is required if you feel fine
- C.1 hour per drink is a legal guarantee
- D.30 minutes is the federal standard
Correct answer
A. You may not drive within 4 hours after using alcohol, and may not use alcohol while on duty
Why
Federal rules prohibit performing safety-sensitive functions within 4 hours after using alcohol and prohibit on-duty possession and use. Feeling fine does not override the time rule or the testing thresholds that apply to CDL holders.
Manual topic: Fatigue - Alcohol Rule · From the General Knowledge practice bank (GK-274).