If a malfunction is present, the monitoring unit will automatically put the intersection into what mode?

Answer: B — Flash mode

When a malfunction occurs in a traffic signal system, the monitoring unit is designed to ensure safety and minimize disruption at the intersection. Flash mode is activated during such malfunctions to alert drivers and pedestrians that there is an issue with the normal operation of the traffic signals. In flash mode, the traffic lights typically switch to a blinking yellow for the main thoroughfare and blinking red for side streets, indicating to drivers that they should proceed with caution and treat the intersection similarly to a stop sign. This helps to prevent accidents by forcing drivers to be more aware and take control of their actions at the intersection while the malfunction is being addressed. The automatic transition to flash mode is a critical feature for maintaining safety at intersections when problems arise, which underscores the importance of timely responses and appropriate signal operation in managing traffic flow and ensuring the safety of all road users.