Driver Standards and Serious Traffic Violations
Higher standard
CDL holders are held to a higher standard because a violation can remove them from commercial driving. Convictions are posted to the driving record and reported through the Commercial Driver's License Information System. A driver must notify the employer within 30 days of a traffic conviction (except parking) and within 24 hours of a suspension, revocation, cancellation, or disqualification. The CMV alcohol limit is 0.04 BAC, not the 0.08 used for noncommercial drivers.
Major and serious offenses
Major offenses include DUI/alcohol at 0.04 or more in a CMV, refusing an alcohol test, leaving the scene of an accident, using a CMV in a felony, driving a CMV while a CDL is suspended, and causing a fatality by negligent CMV operation. A first major offense disqualifies for one year; a hazmat major offense disqualifies for three years; a second major offense is a lifetime disqualification. Serious traffic violations include speeding 15 mph or more over the limit, reckless driving, improper or erratic lane changes, following too closely, and certain fatal-crash or no-CDL violations. Two serious violations within three years = 60 days; three within three years = 120 days.
Worked example
A driver receives a reckless-driving conviction and, seven months later, an 18-mph-over speeding conviction. Both are serious traffic violations, and the second within three years triggers a 60-day CDL disqualification. If a third serious violation occurs within three years, the disqualification rises to 120 days. Neither conviction is a major offense, but the cumulative rule still removes the CDL temporarily.
Traps
Do not treat 10 mph over as “excessive speeding” for this rule; the federal threshold is 15 mph or more. Do not mix major and serious penalties. Do not assume a personal-vehicle DUI is outside CDL rules; a DUI can be a major offense, while the 0.04 threshold applies specifically to CMV operation. A lifetime disqualification follows a second major offense, not a second serious violation.