(じゅうたい)

じゅうたい
noun
traffic jam, congestion
See also: 重体(じゅうたい) (critical condition)
1. traffic jam, congestion, delay
A situation where traffic or other movement is slowed or stopped due to high volume.
The highway is congested.
I was late to the meeting because of traffic.
連休(れんきゅう)渋滞(じゅうたい)ひどい
Traffic is terrible during consecutive holidays.

渋滞(じゅうたい)する is used as a する-verb meaning "to be congested."

COMMON COLLOCATIONS:

CULTURAL NOTE:
Traffic jams (渋滞(じゅうたい)) are notorious during (ぼん) (mid-August) and 年末(ねんまつ)年始(ねんし) (New Year period) in Japan.