What is the minimum height requirement for vertical panels in work zones?

The minimum height requirement for vertical panels in work zones is established to ensure their visibility and effectiveness in guiding traffic safely through or around construction sites. A height of 24 inches is adequate to make the panels noticeable to drivers, particularly in adverse conditions or when vehicles are moving at higher speeds. This specification helps to improve safety by minimizing the risk of accidents due to insufficient guidance in work zones, ensuring that the panels are above the line of sight for most vehicles.

In contrast, other height options may either not provide adequate visibility for all traffic scenarios or may exceed the necessary requirements. Therefore, having a standardized minimum height of 24 inches is critical for effective communication and safety in work zones.