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The 24 worst highway bottlenecks, followed by the number of vehicles handled daily and annual hours of delay, according to a study by American Highway Users Alliance.

Los Angeles -- Ventura Freeway US-101 at I-405 interchange; 318,000 cars; 27,144 hours.

Houston -- I-610 at I-10 interchange; 295,000 cars; 25,181 hours.

Chicago -- I-90/94 at I-290 "Circle Interchange;" 293,671 cars; 25,068 hours.

Phoenix -- I-10 at SR-51/202 "Mini-Stack" interchange; 280,800 cars; 22,805 hours.

Los Angeles -- I-405 at I-10 interchange; 296,000 cars; 22,792 hours.

Atlanta -- I-75 at I-85 interchange; 259,128 cars; 21,045 hours.

Washington, D.C. -- I-495 at I-270 interchange; 243,425 cars; 19,429 hours.

Los Angeles -- I-10 at I-5 interchange; 318,500 cars; 18,606 hours.

Los Angeles -- I-405 at I-605 interchange; 318,000 cars; 18,606 hours.

Atlanta -- I-285 at I-85 "Spaghetti Junction" interchange;266,000 cars; 17,072 hours.

Chicago -- I-94 at I-90 interchange; 260,403 cars; 16,713 hours.

Phoenix -- I-17 at I-10 "the Stack" interchange to Cactus Road; 208,000 cars; 16,310 hours.

Los Angeles -- I-5 at SR-22/57 "Orange Crush" interchange; 308,000 cars; 16,304 hours.

Providence, R.I. -- I-95 at I-195 interchange; 256,000 cars; 15,340 hours.

Washington, D.C. -- I-495 at I-95 interchange; 185,125 cars; 15,035 hours.

Tampa, Fla. -- I-275 at I-4 "Malfunction Junction" interchange; 201,500 cars; 14,371 hours.

Atlanta -- I-285 and I-75 interchange; 239,193 cars; 14,333 hours.

Seattle -- I-5 and I-90 interchange; 301,112 cars; 14,306 hours.

Chicago -- I-290 Eisenhower Expressway between exits 17b and 23a; 200,441 cars; 14,009 hours.

Houston -- I-45 Gulf Freeway at US-59 interchange; 250,299 cars; 13,944 hours.

San Jose, Calif. -- US-101 at I-880 interchange; 244,000 cars; 12,249 hours.

Las Vegas -- US-95 at I-15 "Spaghetti Bowl" interchange; 190,600 cars; 11,152 hours.

San Diego -- I-805 at I-15 interchange; 238,000 cars; 10,992 hours.

Cincinnati -- I-75 from Ohio River Bridge to I-71 interchange; 136,013 cars; 10,088 hours.