1.   Iraqi convoys using secondary roads and pontoon bridges created serious congestion and became simple targets for air attack.

2.   When they returned to their habitual solo commutes, serious congestion developed at the detours and jerry-built overpasses, which lasted for months.

3.   Excess blood accumulates, especially in the lungs, producing serious congestion and often, eventual death.

4.   The port development works began last month to solve the serious congestion problems stemming from the unprecedented growth in the economy of Negros Oriental.

5.   The rallies caused serious congestion on highways and roads.