Gawker jam is a traffic jam caused by drivers slowing down to gawk, they may be staring at the wheel in an unthinking way, not even hearing the warning horns behind their cars.

发呆堵车指驾车人把车速减下来发呆导致的交通堵塞，他们可能正出神地盯着方向盘，甚至都没有听到车后警示的喇叭声。

For example:

After miles of creeping along the congested highway, the motorist discovered the source of the frustration was only a gawker jam.

在拥堵的路上爬行了好几英里之后，司机才发现原来整个堵塞是发呆堵车导致的。