What width should be maintained for effective visibility and safety for vertical panels?

The recommended width for vertical panels to ensure effective visibility and safety is typically 8 to 12 inches. This width range allows the panels to be noticeable without being overly bulky, which could obstruct views or create other hazards. When vertical panels are within this width range, they strike a balance between prominence and practicality, enabling drivers and pedestrians to clearly recognize warning signs and important information in a work zone.

Using panels wider than this range could potentially hinder visibility by making it harder for them to stand out against the background, while panels that are too narrow may not effectively capture attention or convey necessary warnings. Ensuring that vertical panels conform to the 8 to 12 inches specification enhances not just safety but also compliance with established safety guidelines for traffic control devices in work zones.