Which of the following is a serious traffic violation that can lead to CDL disqualification?

A DUI conviction or reckless driving is considered a serious traffic violation that can lead to CDL disqualification due to the potential for causing harm to others and the responsibility that comes with operating commercial vehicles. Commercial drivers are held to higher standards because they are responsible for the safety of themselves and others on the road. A DUI conviction demonstrates a disregard for safety and can undermine public trust in commercial drivers. Similarly, reckless driving indicates a willful disregard for lawful behavior and safety regulations, which is unacceptable for someone in a position to operate large, potentially dangerous vehicles.

In contrast, while speeding over 10 mph may lead to consequences, it is typically not classified as a serious violation on the same level as DUI or reckless driving. Parking violations and driving without a seatbelt are concerns for all drivers but do not carry the same severe implications for CDL holders as driving under the influence or recklessly does. The regulations are structured to emphasize the importance of safety and responsibility in the profession of commercial driving, hence the classification of certain offenses as serious.