Which color lights are used to indicate a service road?

Amber lights are used to indicate a service road due to their high visibility and ability to signal caution to drivers. This color is commonly associated with warning signs and is well understood in various traffic contexts to denote areas that require special attention, such as service roads that may be more active or have different traffic patterns compared to regular roadways.

In many traffic systems, different colors serve specific purposes; for example, red typically signifies a stop or danger, while green often indicates safe passage. White lights are generally used for standard illumination and clarity rather than as indicators for specific road conditions. The choice of amber helps to effectively communicate to drivers about service roads, emphasizing caution and awareness.