On the last day of the Lunar New Year holiday, many Koreans will be hitting the road, after travelling far for family gatherings and ancestral rites.
The Korea Expressway Corporation says more than 3.5 million vehicles are expected to pack the roads.
Routes to Seoul from other parts of the nation will especially be packed.
Traffic will ease after around 10pm.
As of 6pm, if you're driving this direction from Busan or Ulsan, brace yourself for a near 4 and a half hour roadtrip, around 4 hours from Mokpo, Daegu or Gwangju, close to 3 and a half.
Less than 3 hours from Gangneung or Dajeon.