What is the background color of the HILL sign?

The background color of the HILL sign is yellow. This color is used to indicate caution and alert drivers to potential hazards ahead, such as a steep incline or hill. Yellow is a color commonly associated with warning signs, and it is effective in drawing attention, which is crucial for conveying important information to drivers. The use of yellow helps ensure that the sign is visible in various lighting conditions, enhancing safety on the road. Signs that provide cautionary information, like the HILL sign, are designed to prevent accidents by preparing drivers for upcoming changes in terrain.