How far should PCMS boards be visible at both day and night?

The recommended visibility distance for Portable Changeable Message Signs (PCMS) at both daytime and nighttime is 1/2 mile. This distance ensures that drivers have sufficient time to react to the information displayed, allowing for safe navigation through work zones. The visibility standard takes into consideration the need for clear communication of important messages, especially in construction or maintenance areas where conditions may change rapidly.

At this distance, messages can be seen clearly, allowing drivers to make adjustments to their speed or route as needed. Adequate visibility is critical for work zone safety, as it greatly reduces the likelihood of accidents caused by drivers being unaware of road conditions or hazards. This standard is established in safety protocols to enhance driver awareness and ensure overall road safety.