Final answer:
When you see a flashing hand, you should proceed with caution and start crossing the road if it's safe. Pay attention to the countdown signals and solid raised hand to know when to stop.
Step-by-step explanation:
When you see the first signal, which is a flashing hand, you should proceed with caution.
This signal indicates that the pedestrian crossing time is about to end, and it's a warning for you to start crossing the road if it's safe to do so.
It is important to pay attention to the countdown signals and eventually the solid raised hand to know when to stop or continue crossing the road.