교통 체증이 · 교통 체증을
traffic jam, traffic congestion
Example
출근 시간에는 교통 체증이 아주 심해요.
Traffic is really bad during the morning rush hour.
Word parts
교 exchange+통 pass+체 stuck+증 symptom
Literally 'traffic stuck-symptom'; 체증 on its own also means indigestion.
Good to know
In conversation people usually say 차가 막혀요; 교통 체증 sounds like news or writing.
Related words