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77 7.2.1 Highways occur on the interstate highway system and 42 percent were interchange related. These top 30 bottlenecks occur at urban Locations of nationally recognized bottlenecks in the high- interchanges in metropolitan areas with high population den- way freight transportation system present opportunities for sities and major freight activity centers. The study also con- implementing low-cost improvements to help alleviate the cluded that low-cost improvements can result in significant constraints. The freight bottlenecks study (12) identified the improvements in traffic flow. Analysis of freight performance top 30 freight highway bottlenecks to be poorly functioning measurement data (88) re-ordered the top 30 freight bottle- interchanges on the NHS. These bottlenecks were identified necks. This latter analysis was based on truck traffic volume based on analysis of the performance in terms of volume/ and reductions in truck speed below the posted speed limits capacity ratios and delay derived from freight flow data. The through these interchanges. Table 30 shows the locations of the study has shown that more than 70 percent of bottlenecks top 30 bottlenecks and their traffic and other performance Table 30. Performance characteristics of top 30 highway bottlenecks (58, 88, 89). CSI ATRI Freight Truck AADT V/C AADT ranking ranking Location State Congestion % (2007) (2002) (2002) (2002) (2009) value (2002) 5 1 I-80 @ I-94 Interchange IL 2,722,629 144,602 1.104 128,049 24.0% 19 2 I-95 @ SR-4 Interchange DE 1,435,661 93,979 0.923 88,425 15.5% 9 3 I-90 @ I-94 Interchange IL 921,688 175,548 1.151 163,805 6.0% I-285 @ I-85 Interchange 3 4 GA 899,899 286,300 1.850 254,600 16.0% ("Spaghetti Junction") I-95 @SR-9A (Western 13 5 NY 656,190 98,834 1.187 79,755 5.0% Hwy) I-40 @ I-65 Interchange 10 6 TN 446,933 192,073 1.925 114,280 17.1% (east) 6 7 SR-60 @ SR-57 Interchange CA 426,569 344,294 1.173 216,000 12.0% 24 8 I-10 @ I-15 Interchange CA 382,200 289,504 1.190 258,000 12.0% 21 9 I-45 @ US 59 Interchange TX 318,853 265,768 2.065 212,241 7.0% 26 10 I-45 @ I-610 Interchange TX 259,704 301,828 2.396 260,770 8.1% I-20 @ I-75/I-85 4 11 GA 234,258 452,556 1.500 199,000 16.1% Interchange I-17 (Black Canyon Fwy): I- 2 12 AZ 225,892 309,032 0.985 255,371 9.1% 10 Interchange (the Stack) 25 13 I-95/I-495 MD 183,772 260,904 1.912 185,125 7.1% 1 14 I-710 @I-105 Interchange CA 156,987 280,731 1.393 224,000 9.0% 14 15 I-71 @ I-70 Interchange OH 144,772 188,724 1.648 107,722 17.0% I-80 @ I-580/I-880 in 7 16 CA 144,009 292,437 2.241 177,763 9.0% Oakland 12 17 I-75 @ I-85 Interchange GA 138,824 353,005 1.018 295,000 16.0% 15 18 I-880 @ I-238 CA 129,421 339,634 1.206 271,000 10.8% 18 19 I-695/I-70 and I-95 exit 11 MD 119,629 217,885 1.983 165,050 7.0% I-10 @ I-110/US 54 20 20 TX 115,516 232,273 1.379 200,677 7.8% Interchange 30 21 I-25 @ I-76 Interchange CO 107,116 246,429 1.198 237,839 9.0% I-10 @ I-410 Loop North 27 22 TX 93,066 193,670 1.747 117,179 7.8% Interchange 17 23 I-285 @ I-75 Interchange GA 58,784 211,107 2.108 153,600 16.1% 11 24 I-290 @ I-355 Interchange IL 56,591 239,337 1.782 213,906 9.0% I-10 @ SR-51/SR-202 23 25 AZ 51,486 339,804 1.955 152,880 7.0% Interchange (Mini-Stack) 28 26 I-110 @ I-105 Interchange CA 40,647 365,953 1.484 230,000 6.0% 16 27 SR-91 @ SR-55 Interchange CA 36,746 315,719 1.103 298,000 8.1% 29 28 I-95 @ SR-595 Interchange FL 28,291 315,890 1.395 288,000 9.0% I-405 (San Diego Fwy) @ 8 29 CA 16,732 472,480 1.376 377,000 6.0% I-605 Interchange 22 30 SR-134 @ SR-2 Interchange CA 3,200 235,433 1.083 205,000 6.2% Note: Freight Congestion value = number of trucks multiplied by difference between average and speed limits