What type of message would a Portable Changeable Message Sign display?

A Portable Changeable Message Sign (PCMS) is specifically designed to communicate real-time information to drivers, which is why displaying real-time traffic updates is the correct choice. These signs are often used in construction zones, major traffic incidents, or when road conditions change dynamically. By providing timely messages, such as traffic jams, detours, or accidents ahead, PCMS helps drivers make informed decisions on their routes, enhancing safety and improving traffic flow.

While permanent traffic restrictions, weather conditions, and route directions are important pieces of information, they do not align with the primary function of a Portable Changeable Message Sign. Permanent traffic restrictions are typically displayed on fixed signs, weather conditions can be conveyed through other channels or signs, and route directions are generally given through traditional directional signage. The adaptability and immediacy of real-time updates are what make PCMS an essential tool in managing traffic effectively.