What type of signal is typically required for directing traffic at nighttime?

High-intensity signals are specifically designed to be more visible during nighttime and in low-light conditions. These signals utilize advanced light technologies, such as LED bulbs or enhanced reflective materials, which provide greater luminance compared to standard signals. The increased brightness ensures that these signals can be easily seen by drivers and pedestrians, thus enhancing safety on the roads when visibility is poor. This characteristic makes high-intensity signals the preferred choice for nighttime traffic direction, as they effectively convey important traffic information without compromising legibility or safety.

Flashing signals, while noticeable, may not provide the continuous visibility needed at night. Directional signals convey information about the intended direction but may not possess the needed intensity for nighttime operations. Dimming signals adjust brightness based on ambient light but are not primarily used for directing traffic at night. Hence, high-intensity signals are the most suitable choice for nighttime traffic management.