"It's a very dangerous situation".Snowfall has stopped, but 'notice' on the way to and from work in fear. [Y Record]

■ Host: Lee Yeo-jin, anchor Jang Won-seok
■ Starring: Kim Jin-doo, YTN weather disaster reporter, Yeom Gun-woong, professor of police fire administration at Yuwon University,

* The text below may differ from the actual broadcast content, so please check the broadcast for more accurate information. Please specify [YTN News PLUS] when quoting.

◇Anchor> I'm worried about the icy road because the wet snow melts, freezes, and continues to fall. A 53-car crash occurred in Gangwon-do yesterday. What should I be most careful about on my way home from work?

◆Yum Geon-woong> First of all, you have to pay attention to road traffic, but there was actually a case where the sun was shining during the day earlier. So the snow has melted almost a lot and snow removal is almost perfect. However, the problem is that this snow melts again and then freezes. At night, there is a possibility that this snow will freeze again because the wind is very windy and the wind is around -1 degrees Celsius in the YTN report earlier. Then the so-called black ice is created. That's why invisible ice sheets are created. When black ice like this is produced, it is a very dangerous situation. There is a high possibility that such an accident will occur again, such as yesterday's 53-car crash. In particular, the danger of black ice is that we drive while looking at snow, so we slow down. It decelerates by saying that there is snow, but black ice looks fine on the outside. Because it looks just like a road or asphalt, there are times when you speed up, and then it's very difficult to stop the brakes while you speed up. Even if you put the brakes on it, the vehicle completely goes wrong and turns around. So, in such a crash, there is a situation where you can't brake, especially at night. Especially during the day, under an overpass or in an area with low traffic. These places are very likely to produce black ice. And when we look at the road as three one-way lanes, when there are one, two, and three lanes, you have to go to the two lanes on the main road. Because in the case of the first lane, it's on the guardrail side, but when I put the snow this way, there's a pile of snow on the guardrail side. Then there is a possibility that it melts again and flows into the first lane, and there is a possibility that it freezes again. The same is true for the third order. There are sidewalks and boundary stones, so I put a lot of snow away there. There is a possibility that the snow may melt again and enter the third lane, so it's better to drive in the second lane, or if there are 1st or 2nd lanes, I think it's a way to ensure safety to operate the first lane because the first lane is usually a parking lane.

◇Anchor> Wet snow is the snow that holds more water. So if it melts and then freezes again, can there be more black ice?

◆Yum Geon-woong> That's right. When we do snow removal, we spray calcium chloride while we do snow removal. The car's tires come into contact with calcium chloride, causing a slush phenomenon. That's why the snow is melting. Naturally, snow melts quickly in places with a lot of traffic. Black ice is likely to form in places with low vehicle traffic, but roads with high vehicle traffic are also more likely to form or generate black ice at night. That's why you have to pay attention. Black ice is actually described as an uninvited guest in winter. It can be very dangerous because ice sheets are created that are invisible enough to be described as uninvited guests on the road. Because if you look at the video tested by the Korea Expressway Corporation, the speed stops as soon as it stops. But the braking distance increases a lot. So, for example, we brake at 50km. In the case of asphalt, it should be considered that the car can be caught right away when the brakes are applied right away. However, in the case of snow, the braking distance increases by 30m based on 50km/h. However, in the case of icy roads, black ice as we speak, the braking distance increases from about 46.2m when driving at 50km to 47.2m for trucks. So you can think of it as the car continuously being pushed out when you put the brakes on it. Therefore, when such black ice is formed, the risk of a collision is very high, especially in road traffic conditions like this.



Excerpted from the conversation: Lee Mi-young, editor of the digital news team

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