For portable changeable message signs, the message should be visible from at least what minimum distance?

The correct answer is based on established guidelines for the visibility of portable changeable message signs (PCMS). A distance of 650 feet ensures that messages displayed on these signs can be clearly seen by drivers well in advance. This allows sufficient time for drivers to comprehend the information, react appropriately, and make any necessary adjustments to their speed or driving behavior. This distance is critical for maintaining safety on the road, especially in scenarios where rapid decision-making is required.

Choosing a shorter distance may not provide drivers with adequate time to respond, leading to potential hazards. The visibility distance of 650 feet is a standard that aligns with best practices for effective traffic communication and safety management. Therefore, adhering to this standard enhances overall road safety for both drivers and pedestrians.