Which of the following is considered a serious traffic violation in Aruba?

Driving under the influence of alcohol is considered a serious traffic violation in Aruba due to the significant risks it poses not only to the driver but also to other road users. Such behavior can lead to severe accidents, injuries, and fatalities, making it essential for the safety of the public to impose strict laws against it. This violation reflects a blatant disregard for the law and the safety of oneself and others, leading to heavy penalties, including fines, license suspension, and possibly imprisonment.

Other options, while serious, do not carry the same level of immediate danger and social impact as driving under the influence. For instance, not wearing a seatbelt is a safety concern but is generally viewed as a more personal risk rather than an immediate threat to others. Parking in a no-parking zone is an inconvenience and can obstruct traffic but does not directly endanger lives. Driving with a flat tire, while potentially hazardous if it leads to loss of control, is still less severe in the context of a clear violation of law compared to impaired driving.