Think of the national parks in the West, and crowds and congestion come to mind.
From the businessweek.com
It takes drivers a while to get used to the heavier congestion at intersections.
From the washingtonpost.com
Sending them by rail would significantly relieve congestion on the port highway.
From the odt.co.nz
The close spacing would allow more cars to fit on the road, reducing congestion.
From the economist.com
Over-the-counter saline nasal drops and sprays combat stuffiness and congestion.
From the delawareonline.com
My bicycle does not cause traffic congestion, and I never get struck in traffic.
From the sacbee.com
The third coming in from a frontage road gives no relief to the Loop congestion.
From the chron.com
A little bit of congestion, though annoying for drivers, can serve this purpose.
From the latimes.com
Highway planners long have known that we cannot build our way out of congestion.
From the dispatch.com
More examples
Excessive accumulation of blood or other fluid in a body part
Excessive crowding; "traffic congestion"
(congested) overfull as with blood
(congestive) relating to or affected by an abnormal collection of blood or other fluid; "congestive heart disease"
Traffic congestion is a condition on road networks that occurs as use increases, and is characterized by slower speeds, longer trip times, and increased vehicular queueing. The most common example is the physical use of roads by vehicles. ...
The act of gathering into a heap or mass; accumulation; An excess of traffic; Overfullness of the capillary and other blood vessels, etc. ...
(congested) Smeared, confused, muddy, and flat. Totally devoid of transparency.
(Congestive) An excessive amount of blood collected in any tissue or organ.
A state in which the network is overloaded and starts to discard user data (frames, cells or packets).