'very congested' is correct and can be used in written English.
For example, you can use it to describe a traffic jam such as, "The highway was very congested with cars."
Bristol is very congested.
"Co-op City's a very congested place," said Mr. Bonanno, a 58-year-old social worker.
You've got to be a baby sitter, and you've got to drive this 40-foot vehicle through very congested streets".
"Where I live is very congested, but when I drive to work, there's not much traffic on the road.
So maybe, for example, our landlord buys a plot then builds many houses to rent, then many people just come there you see, now it's very congested.
The land route to India is open, and flights are landing round the clock at the nation's single, and now very congested, international airport.
"You have a very congested area, and a lot of people are transit-dependent in this corridor as well," Mr. Cahalan said.
India has very bumpy, congested roads, and the traffic can be bad too.
Like SUIT, FCE calculates the congestion periodically via a fuzzy logic-based calculation and three different congestion levels described as slight congestion, somewhat congested, and very heavy congestion.
In each case the spleen appeared congested and very enlarged, approximately 3 times larger than normal.
