Which of the following is required at night for loads extending beyond 4 feet?

When transporting loads that extend over 4 feet at night, it is necessary to display a red light. This requirement is in place to ensure the safety of both the vehicle operator and other drivers on the road. The red light serves as a warning signal, making the load more visible in low-light conditions, and helps to prevent accidents by clearly indicating the presence of an extended load.

In contrast, reflective tape, while useful for visibility, does not provide the same immediate visual alert during nighttime conditions as an illuminated signal would. A warning sign may be effective during the day but lacks the light needed to draw attention at night. A flashlight, though it may provide some visibility to the operator, does not serve as a proper signal to other drivers regarding the extended load. Thus, the red light is specifically mandated for nighttime conditions to ensure safety when transporting oversized loads.