Which of the following is NOT a recommended safety and security guideline?

The correct answer indicates that allowing the driver to open any doors or compartments while inspecting is not a recommended safety and security guideline. This approach prioritizes safety by limiting the driver's actions during an inspection. When vehicles are being inspected, especially in sensitive or potentially hazardous environments, it is crucial to minimize distractions and potential accidents. Allowing the driver to open doors or compartments can lead to unintentional hazards, especially if they open something that could obstruct the inspector's view or access to necessary equipment or safety gear.

In contrast, the other options are established safety practices. Wearing brightly colored vests or hats enhances visibility and helps ensure that individuals are seen by others, enhancing overall site safety. Avoiding smoking near combustible vapors is critical to prevent fires or explosions. Using chock blocks provides stability and security to the vehicle, preventing it from rolling and ensuring the safety of those inspecting the vehicle. Thus, the guidelines are all about creating a safer inspection environment, while the selected option deviates from those principles.