During night traffic control, which lights are used primarily for warning purposes?

The correct choice identifies Type B lights as the primary lights used for warning purposes during night traffic control. Type B lights are specifically designed to be highly visible and communicate alerts to drivers about possible hazards or changes in road conditions. These lights typically have a yellow or amber color, which is universally recognized as a cautionary signal.

Their primary function is to warn drivers of potential dangers, such as construction zones, detours, or other obstructions on the roadway. The design and color of Type B lights ensure that they can be easily seen in low-light conditions, which is crucial for maintaining safety and preventing accidents during nighttime driving.

Other types of lights, while they may serve different purposes or have specific uses, do not primarily focus on warning as Type B lights do. Understanding the role and application of different types of lights in traffic control is essential for effective safety management and ensuring that drivers receive the necessary information to navigate safely.