Which type of light is used to delineate the edge of a traveled way?

The correct answer identifies that Type D lights are designed explicitly for delineating the edge of a traveled way, serving a critical function in roadway safety and guidance. These lights are typically utilized in areas where a clear distinction between the roadway and surrounding hazards or unpaved areas is needed, particularly at night or in low visibility conditions.

Type D lights often have specific characteristics such as brightness and color that enhance their visibility and effectiveness in marking the edge of the traveled way. Their role is to guide drivers, reduce the risk of accidents, and improve the overall flow of traffic, especially in construction zones or during road operations where standard lane markings may not be visible.

Other types of lights serve different purposes or are designed for other aspects of traffic management and safety, but Type D lights are distinctively focused on edge delineation, making them the appropriate choice for this particular function.