What is the color of warning lights for vehicles used by public utility companies?

The correct answer, amber, reflects the standardized use of warning lights on vehicles operated by public utility companies. Amber lights are commonly used to alert other drivers to the presence of service vehicles that may be working on or near public roadways. This distinctive color is effective for signaling caution without implying the presence of emergency situations, which is typically associated with red and blue lights.

Additionally, the use of amber lights serves to enhance visibility and safety for both utility workers and other motorists, signaling that the vehicle may be stationary or moving slowly and that caution is required when approaching. The specific color coding helps create a clear understanding among drivers about what to expect, thereby improving road safety overall.