Chuseok Holiday Causes Major Traffic Congestion
The annual national traffic jam began again this weekend:

Cars are stuck on the Gyeongbu Expressway in Seoul on Oct. 3, 2025, the first day of the extended Chuseok holiday. (Yonhap)
Heavy traffic began to build on major roads and highways across South Korea on Sunday as people headed to their hometowns for family reunions a day ahead of Chuseok.
Chuseok, the Korean fall harvest festival, falls on Monday but South Koreans are enjoying an extended holiday from Friday to Thursday, as it falls between National Foundation Day and Hangeul Day, which marks the creation of the Korean alphabet.
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Chuseok is the best time to be in Seoul. Traffic slows down to “busy” instead of “insane”.
And the weather is usually wonderful.
Chuseok is definitely the best time to be in Seoul. Like you said no traffic, subways have few people in them, and virtually no lines anywhere that is open.