What color background and letter combination is used for all work zone signs?

Work zone signs are crucial for ensuring the safety of both construction workers and motorists. The use of an orange background with black letters is a standardized practice for these signs. This color combination is chosen because orange is highly visible and easily distinguishable, particularly in conditions where visibility might be compromised, such as in low light or during inclement weather. The contrasting black lettering provides clear communication of important messages, such as road work ahead, speed limits, and detours, effectively alerting drivers to the presence of construction activities and potential hazards.

In contrast, other colors and combinations serve different purposes: the yellow background with black letters is used for general warning signs that indicate caution but are not specific to work zones; the red background with white letters signals regulatory signs, especially stop and yield signs; and the green background with white letters typically indicates informational signs or guidance about permitted movements and directions, such as hospital or directional signs. Thus, the orange background with black letters is specifically reserved for the unique needs of work zones to maximize safety and awareness on roadways.