What is one key function of Type C lights during nighttime?

Type C lights serve an important role during nighttime, particularly in enhancing safety for drivers and pedestrians. Their primary function is to delineate roadway edges, which helps create clear visual boundaries for vehicles navigating through or around construction zones. This is critical because it aids in alerting drivers to the limits of the roadway, especially in low visibility conditions at night. The presence of Type C lights ensures that drivers can identify where the road ends and where the construction area begins, reducing the likelihood of accidents or unintended off-road incursions.

While vehicle visibility and illumination of construction crews are also vital aspects of nighttime safety, Type C lights specifically cater to marking the edges of the roadway to guide vehicles safely. Marking speed limits is not a typical function associated with Type C lighting.