What is prohibited regarding outdoor messages between 2100 and 0600?

The correct response highlights an important aspect of safety and security regulations regarding outdoor messaging. During the hours of 2100 (9 PM) to 0600 (6 AM), outdoor messages are prohibited unless they pertain to emergencies. This rule is designed to minimize distractions and ensure that any vital information, especially related to safety or urgent situations, can be communicated effectively without unnecessary interruptions from non-essential messages.

During nighttime hours, excessive outdoor messaging could lead to confusion or disruption in areas where clarity and promptness in communication are crucial. Therefore, limiting outdoor messages to emergency situations helps ensure that critical information takes precedence and that the public's attention is directed to what is most important, especially during hours when visibility and alertness might be lower. This regulation aims to maintain order and focus during times when distractions can have greater consequences.