What happens when a car is flooded? August 28, 19:40

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In this record heavy rain, there are a lot of cases that seem to have been damaged by riding in a car. What should drivers pay attention to during heavy rains?

The JAF = Japan Automobile Federation conducts various experiments on the danger of vehicles getting inundated, and introduces countermeasures in the event of an emergency on the website.

Flooded roads How dangerous is it? What is the handling method?

In JAF, an experiment was conducted to see how much water level the driver's door could not be opened.

The water level was raised from 30 cm to 30 cm in depth, and when it reached 60 cm or more, the back of the car body floated and the door could not be opened.

Depending on the vehicle type and other conditions, the sedan type will only lift the back of the car body due to the weight of the engine, and the inundation will proceed little by little.

In this state, the difference in water pressure between the inside and outside of the car will increase, and the door will not open.

In the case of a power window, the door glass cannot be opened when the engine stops.

After that, if the inundation proceeds into the car, the difference in water pressure becomes smaller and the door can be opened.

Shunichi Miyazawa, JAF Traffic Environment Department, said, “If you can't escape right away, wait for a while to flood, and then open the door after the water pressure difference between the inside and outside of the car disappears. It ’s important to act. ”

If you get trapped in the car

What should I do if I still cannot escape and are trapped in a submerged car?

JAF is experimenting to break the glass on the driver's seat door using something in the car.

In the experiment, I tried using headrests, smartphones, plastic umbrellas, car keys, etc., but none of them could be broken.

I was finally able to break it with an escape hammer.

The windshield cannot be broken, and there are some types that do not break even with the door glass. In addition, you need to be careful after escaping.

Mr. Miyazawa said, “Especially on flooded roads, the water is muddy, the depth of the water is not known, and your feet may be scooped. You should move carefully, such as not to walk near the corners of the road.” It was.