1.   Designed to give amateur filmmakers a break, Greenlight has hit major congestion.

2.   Major congestion comes from multiple lanes feeding into the two-lane tunnels and expressway ramps.

3.   Traffic theorists agree that major congestion reduction will require much more than mathematical simulation and that politics will always play a defining role in efforts to improve traffic flow.

4.   The road was closed for several hours causing major congestion.

5.   The road was closed for five hours as police cleared casualties and the wreckage causing major congestion in the region.