I had to experience the Chuseok traffic madness once in my life (6 hours driving from Chungju to Uijongbu), which was more then enough for me, how people keep their sanity doing it every holiday is beyond me:

Cars have begun clogging highways as many South Koreans head to their hometown for the Chuseok holidays.

An estimated 230-thousand cars on Monday left the capital region for provincial areas via major highways.

The Korea Expressway Corporation expects that the roads will be busiest between 6 p.m. and 8 p.m.

It is likely to take travelers who left Seoul at 5 pm about five hours and 50 minutes to get from Seoul to Busan.

Travel time is expected to be about two hours and 50 minutes from Seoul to Daejeon and four-and-a-half hours from Seoul to Gwangju.  [KBS Global]