What colors are used exclusively for Temporary Traffic Control (TTC) warning and guide signs?

In Temporary Traffic Control (TTC) situations, the colors that are used exclusively for warning and guide signs are orange and black. These colors are specifically chosen to convey critical information related to construction and maintenance activities on roadways. Orange is a highly visible color that alerts drivers to the presence of work zones, indicating that caution is necessary. Meanwhile, the black color is utilized for the legends and symbols on the orange background, which makes the messages clear and easy to read.

The combination of orange and black supports the uniformity and recognizability of TTC signage, ensuring that motorists can quickly understand the conditions ahead and adjust their driving behavior accordingly. This is essential for maintaining safety in work zones, where unexpected hazards may arise.