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DENVER — A stretch of Interstate 25 through downtown Denver ranks as the 50th worst traffic corridor in the U.S., according to analysis by data-research firm Inrix.

The 15.7 mile drive between Colorado Boulevard and 84th Avenue takes 16 minutes on a good day. During peak rush hour traffic, it can take 41 minutes, adding 37 hours a year that commuters are stuck in traffic.

The most congested time is 4 p.m. Fridays, with 8 a.m. Thursdays also a difficult time.

Other rough stretches in Colorado included I-25 between Colorado Boulevard and 48th Avenue (146th) and Interstate 70 between the Winter Park exit and Dumont (346th).

The top 20 was dominated by Los Angeles, with 10 of the top spots, including six of the top nine. The worst traffic corridor is a 26-mile stretch of U.S. 101 in the San Fernando Valley that usually takes 26 minutes can reach delays of 91 minutes.