noun
traffic jam due to an accident; accident-induced congestion
Specifically refers to traffic congestion caused by a vehicular accident, as opposed to general congestion (渋滞) or rush-hour traffic.
高速道路で事故渋滞に巻き込まれた。
I got caught in a traffic jam caused by an accident on the expressway.
事故渋滞のため、到着が遅れそうです。
Due to accident-induced congestion, I will likely be late.
Compound of 事故 (accident) and 渋滞 (traffic jam).