10/23/2026
For a commercial driver operating a personal, non-commercial vehicle, the legal blood alcohol concentration (BAC) limit is 0.08% in most states, matching the standard limit for regular adult motorists.
However, a critical distinction applies to commercial driver's license (CDL) holders:
In a personal vehicle: You are generally subject to the standard 0.08% BAC limit for a DUI under state law.
In a commercial vehicle: The strict 0.04% limit applies.
The CDL Disqualification Risk: Even though the driving limit is 0.08% in your personal car, a DUI conviction in your personal vehicle will still result in the disqualification/suspension of your CDL (typically for 1 year for a first offense). Furthermore, restricted or hardship CDLs are not available to let you drive commercially during a suspension period.
State Variations: Some states enforce the lower 0.04% limit for CDL holders even when driving personal vehicles, so local state statutes may vary.