San Francisco Kowloon Flower Street is the most crooked street in the world. In a short block between Hyde Street and Leavenworth Street in San Francisco, USA, there are eight sharp turns. Because of a 40-degree slope and a zigzag curve like "Z", the car can only go down one line. Flowers and plants are flourishing in the street. You can enjoy the beautiful scenery along the sidewalks on both sides of the street. If driving, we must pay attention to the STOP sign. All vehicles, whether straight or turning, must stop at the intersection when they see the "STOP" traffic sign, instead of "slow" down. Turn to go straight, but not let it go to the end, but let one or two vehicles, so cycle alternately and orderly.