What is another word for bumper-to-bumper?
Pronunciation: [bˈʌmpətəbˈʌmpə] (IPA) 
Bumper-to-bumper is an expression often used to describe heavy traffic or congestion. However, there are several other words and phrases that can be used to convey the same idea. For example, the terms gridlock, jam-packed, and crawling are all great synonyms for bumper-to-bumper. Another useful phrase is stop-and-go, which captures the idea of vehicles moving in fits and starts. Similarly, snarled traffic or logjam can also be used to convey heavy congestion. All of these phrases work well to describe the frustrating and slow-moving conditions of rush hour traffic, giving drivers and passengers alike a relatively clear sense of what to expect when navigating crowded roadways.
