Simple past tense and past participle of congest.(verb)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "congested" in a sentence
"The following letter recommends we consider driving restrictions similar to those in congested cities in Latin America, Europe and Asia."
"Oh BTW Rather than a negative tool to reduce congestion how about a positive tool: Perhaps scooter lanes would encourage people to leave the car home and ride scooters in congested areas."
"Analysts on Wednesday called the auction proposal incremental and said it would not provide immediate relief to users struggling to keep their smartphones from grinding to a halt in congested metropolitan areas such as New York."