Which of the following is NOT a motor vehicle inspection sticker violation?

The correct answer is identifying an action that does not constitute a violation related to motor vehicle inspection stickers. Inspecting a motor vehicle more than annually is not a violation because the law generally mandates that vehicles must undergo safety inspections at least once a year. However, there is no limit on how often a vehicle can be inspected within that year. Therefore, conducting inspections more frequently than once a year does not violate any regulations and can be seen as proactive maintenance.

In contrast, the other choices represent clear violations. Displaying or using a fictitious sticker is fraudulent and directly goes against regulations aimed at ensuring vehicles are adequately inspected. Operating a defective vehicle poses safety risks and violates the requirement that vehicles must be in safe operating condition. Lastly, operating a vehicle without a valid inspection sticker is illegal as it indicates that the vehicle has not been assessed for safety compliance. These actions are indeed infractions, emphasizing the importance of maintaining proper vehicle safety standards.