Final answer:
To alert those around you that you're slowing down, you should tap your brakes.
Step-by-step explanation:
If traffic ahead begins to slow, you should tap your brakes to alert those around you that you're slowing down. Tapping your brakes activates your brake lights, which warns the drivers behind you that you're reducing speed. This helps prevent rear-end collisions and allows other drivers to adjust their speed accordingly.