CDL disqualification is governed by 49 CFR 383.51, which establishes separate disqualification tables for major offenses, serious offenses, railroad-highway grade crossing offenses, and violations of out-of-service orders. Major offenses — including DUI, leaving the scene of an accident, using a CMV to commit a felony, or causing a fatality through negligent operation — require a minimum disqualification of one year. A second major offense carries a lifetime disqualification for certain violations.
Serious offenses include excessive speeding (15 mph or more over the limit), reckless driving, improper lane changes, following too closely, and operating a CMV without the proper class license or endorsements — each requiring a minimum 60-day disqualification period. Two serious offenses within three years result in a 60-day disqualification; three or more result in 120 days. These disqualification periods apply even if the CDL holder was driving a non-CMV at the time of the offense.
Any suspension of a driver’s license or privilege to drive — regardless of which state imposed it or the grounds for the suspension — requires the driver to be disqualified from operating a CMV. That applies to suspensions issued by any state, not just the state where the driver is licensed.