Many people like to fly kites in parks, river embankments and other places. While enjoying the fun of flying, they also need to be wary of the inconspicuous kite string. If you are not careful, it may become an "invisible killer". A few days ago, a related case occurred in Hangzhou, Zhejiang.
According to the driving recorder screen at the time of the incident, at about 2 pm on October 25, Ms. Yu from Hangzhou, Zhejiang Province was driving through the East Lake Elevated Highway when a white line suddenly appeared in the air. Due to the suddenness of the incident, Ms. Yu had no time to react, and the vehicle directly hit her.
After the incident, Ms. Yu immediately called the police for help. After the local traffic police arrived at the scene to investigate, they found that the white string hanging in the air was a piece of kite string.
Fu Yuan, instructor of the Urban Squadron of the Traffic Control Brigade of the Linping District Branch of the Hangzhou Municipal Public Security Bureau: After arriving at the scene, a kite string was found, about several hundred meters long, causing damage to Ms. Yu’s car roof, radar, door frame, and sunroof. After thorough investigation and video tracing, the kite involved and the kite flyer were found. After investigation, the accident was deemed an accident, and the accident has been identified and followed up.
Fire test experiment
How "powerful" is a kite string?
Why can the seemingly thin and soft kite string easily cut the car body? How powerful is it? The reporter from the main station and the Hangzhou Fire and Rescue Bureau conducted a set of experiments. Let’s take a look.
This experiment selected the most common polyester fiber kite string on the market. This type of string is strong, wear-resistant and not easy to break.
Static cutting experiment
Firefighters tightened the kite string between two poles and used chicken breasts to simulate human soft tissue for testing. The tight kite string cut the chicken breasts into two pieces.
Dynamic cutting experiment
The firefighter tightened the kite string of the same specification between two large trees with the same tension, and set off on a battery scooter 30 meters away from the kite string. Simulating daily riding conditions at a speed of 25 kilometers per hour, the firefighter quickly crossed the kite string with radish, green pepper, and chicken breast in hand. After testing, the moment the three items came into contact with the kite string, they were directly cut off by the tight kite string.
Li Wenkui, a firefighter at the Qianjiang Century City Fire Rescue Station of Hangzhou Fire and Rescue Bureau: In the dynamic experiment, the contact surface of the kite line was extremely small. During the fast-moving collision process, the cutting ability will increase geometrically, cutting faster and sharper. If a pedestrian or cyclist hits the tight kite line at high speed, it is easy to be cut. If it comes into contact with the neck, it may even cut off the blood vessels and trachea, and even endanger life.
In addition, whether it is a firefighter on a bicycle or a firefighter sitting in the back of a battery car, the visual deviation is obviously felt when the vehicle is driving.
Li Wenkui: I feel that I am still far away from the line, but when I look up, I am already very close. If it were a real driving process, it would be too late to avoid danger.
The traffic control department reminds:
When flying a kite, be sure to stay away from urban roads and densely populated areas, and choose an open space with no traffic requirements;
When riding or walking through an area where kites are flying, please slow down and observe carefully in advance to prevent accidents.
