What must drivers do when a streetcar has stopped at a pedestrian island?

Answer: B — Proceed carefully on the right

When a streetcar has stopped at a pedestrian island, drivers must proceed carefully on the right. This action is necessary because the vehicle is signaling that passengers may be boarding or disembarking. It’s essential for drivers to remain alert and provide a safe passage for pedestrians while also maintaining safe driving practices within traffic regulations. Proceeding carefully ensures that drivers can react to any pedestrians who may be crossing or are near the streetcar. Given that pedestrians have the priority in this scenario, caution is key to avoid accidents and ensure the safety of everyone involved. This responsibility aligns with the broader traffic laws that prioritize pedestrian safety, particularly when they are utilizing designated crossings or islands related to public transport, like streetcars.