Final answer:
The road sign in question likely advises drivers to expect a traffic signal ahead, especially given the context of the need for speed regulation, pedestrian safety, and accident reduction at an intersection. Standardized road sign symbols and colors should be used to confirm this interpretation.
Step-by-step explanation:
The question of how to interpret a specific road sign can usually be resolved by looking at the sign's symbol and color, which are often standardized to convey specific messages to those using the road. In providing reasons for installing a traffic signal, it is clear that the sign in question probably relates to road safety and the control of vehicle and pedestrian movement. Increased vehicle speeds, pedestrian safety concerns, and a high number of accidents at an intersection are strong indicators of the need for a traffic signal. An interpretative clue for our sign might come from the observed problem: since a traffic signal is beneficial to regulate vehicle speeds, to ensure pedestrian safety, and to reduce the number of accidents, it's likely that the sign in question is advising drivers of an upcoming traffic signal.
If the sign is intended to warn the drivers that they should expect a traffic signal ahead, this would correspond with option 3: Expect a traffic signal ahead. This sign is important because it prepares drivers to adjust their speed and be ready to stop if necessary, ensuring the safety of both pedestrians and drivers.