During periods of non-work, can the Automated Flagger Assistance Device be left unattended while in automatic mode?

The correct answer is that the Automated Flagger Assistance Device (AFAD) should not be left unattended while in automatic mode during periods of non-work. This is crucial for ensuring the safety of both drivers and pedestrians. When the device is functioning autonomously, it must be monitored to ensure that it is operating as intended and reacting appropriately to the flow of traffic. If left unattended, there could be situations where the AFAD fails to respond correctly, which may lead to confusion, accidents, or violations of traffic laws.

Proper monitoring also addresses issues such as potential vandalism, unexpected technical malfunctions, or changes in the work zone that may not be detected if no personnel are present. By ensuring that the device is not unattended, agencies can maintain control over traffic management and ensure that safety is prioritized during all phases of work zone activity.

The other options imply conditions under which unattended operation might be permissible, but they overlook the fundamental importance of continuous oversight for safety during any work zone operation.