What is the purpose of luminance in signage?

The purpose of luminance in signage is specifically to enhance the visibility and readability of signs at night. Luminance refers to the brightness of a surface as perceived by the human eye, and it plays a crucial role in how well a sign can be seen and understood in low-light conditions. Proper luminance ensures that signs can be easily identified and read by drivers and pedestrians after dark, which is especially important in work zones where safety is paramount.

In nighttime conditions, the effectiveness of road signage is significantly impacted by how well it can be illuminated and whether its contents can be clearly perceived. Appropriate luminance enhances safety by reducing the chances of accidents related to poor visibility.

While enhancing visibility and readability during the day is important, luminance specifically addresses nighttime visibility challenges. Aesthetic appeal, although relevant to the overall design of signage, is not the primary concern of luminance. Additionally, reducing the number of signs needed is not a direct function of luminance, as adequate signage is essential for maintaining safety and clarity in work zones.