Under federal rules, a commercial license holder is subject to disqualification for listed violations whether driving a commercial motor vehicle or a non-commercial vehicle. Convictions in either type of vehicle are counted when deciding whether a violation is a first or a later one (49 CFR § 383.51(a)(3)–(4)).
Federal rules list these serious traffic violations that can count in a non-commercial vehicle: speeding 15 mph or more over the posted or regulated limit, reckless driving, improper or erratic lane changes, following too closely, and a traffic-control violation connected with a fatal accident. For a second conviction within 3 years in a non-commercial vehicle, the federal table sets a 60-day disqualification from driving a commercial motor vehicle, and 120 days for a third. In a non-commercial vehicle this applies only if the conviction results in the revocation, cancellation, or suspension of the license or non-commercial driving privileges (49 CFR § 383.51(c), Table 2).
California law says a driver may not operate a commercial motor vehicle for 60 days if convicted of a serious traffic violation involving a commercial or noncommercial motor vehicle, when the offense occurred within 3 years of a separate serious traffic violation that resulted in a conviction. When it is within 3 years of two or more such convictions, the period is 120 days (Vehicle Code §§ 15306 and 15308).
Under California’s commercial driver law, a “serious traffic violation” includes any single speeding offense of 15 miles per hour or more above the posted speed limit (Vehicle Code § 15210(p)(1)).