Final answer:
If a red traffic signal changes to the green while a pedestrian is walking, the pedestrian should continue walking and finish crossing the road while prioritizing their safety.
Step-by-step explanation:
In the given scenario, if a red traffic signal changes to green while a pedestrian is walking, the pedestrian should continue walking and finish crossing the road. It is important for pedestrians to prioritize their safety and follow traffic rules. As the traffic signal has changed to green, it indicates that vehicles are allowed to proceed, and pedestrians should proceed with caution to complete their crossing.