Only for those who have lived in Seoul for a long time (20+ years)

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I clearly remember that when I was young, there were no cars on the roads in Seoul on Chuseok or Lunar New Year's Day.
But these days, there are so many.
Especially on the Olympic Expressway and Gangbyeonbuk-ro, there is congestion all day long.
It's basic to spend at least an hour and a half going from Jamsil to Mok-dong.
Since when did it become like this? Has it been about 10 years?