When executing a three-point turn (turn in the road) in a narrow street, what is the critical safety rule?

1. Complete the turn in a single continuous forward motion at high speed
2. Rely on other vehicles to stop and wait without looking at cross traffic
3. Mount both front wheels on the opposite sidewalk to gain turning radius
4. Perform full 360-degree observations before each movement, turn briskly at slow walking speed, and avoid touching kerbs