What is the maximum allowable blood alcohol content for commercial drivers?

The maximum allowable blood alcohol content (BAC) for commercial drivers is 0.04%. This limit is established because commercial driving represents a greater responsibility due to the size and weight of the vehicles, as well as the potential consequences of accidents involving those vehicles.

Driving with a BAC over 0.04% significantly impairs judgment, coordination, and reaction times—critical skills necessary for safely operating a commercial vehicle. In addition to state laws, federal regulations impose this limit to ensure a higher standard of safety for all road users.

It’s important to emphasize that commercial drivers are held to stricter standards compared to non-commercial drivers, who generally have a higher allowable BAC limit of 0.08%. Understanding these distinctions is crucial for maintaining safety on the road and complying with legal requirements for operating commercial vehicles.