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Highway Statistics 2008

National Highway System Length - 2008 Miles by Volume - Service Flow Ration - Rural and Urban 1/

October 2009
Sheet 1 OF 2
Table HM-42

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STATE VOLUME-SERVICE FLOW RATIO (V/SF)
INTERSTATE SYSTEM OTHER TOTAL
< 0.21 0.21-0.40 0.41-0.70 0.71-0.79 0.80-0.95 > 0.95 TOTAL < 0.21 0.21-0.40 0.41-0.70 0.71-0.79 0.80-0.95 > 0.95 TOTAL < 0.21 0.21-0.40 0.41-0.70 0.71-0.79 0.80-0.95 > 0.95 TOTAL
Alabama - 138 298 33 45 25 539 572 1,156 234 7 1 44 2,014 572 1,294 532 40 46 69 2,553
Alaska 635 250 106 4 15 3 1,013 811 167 3 - - - 981 1,446 417 109 4 15 3 1,994
Arizona 116 617 227 9 11 1 981 535 454 104 5 - 17 1,115 651 1,071 331 14 11 18 2,096
Arkansas 1 137 261 11 30 9 449 838 657 225 25 34 35 1,814 839 794 486 36 64 44 2,263
California 14 357 444 263 150 53 1,281 641 1,293 1,065 123 146 101 3,369 655 1,650 1,509 386 296 154 4,650
Colorado 298 218 118 25 23 - 682 682 642 372 63 38 55 1,852 980 860 490 88 61 55 2,534
Connecticut - 10 18 10 5 - 43 16 62 64 2 11 3 158 16 72 82 12 16 3 201
Delaware - - - - - - - 6 78 69 10 3 5 171 6 78 69 10 3 5 171
Dist. of Columbia - - - - - - - - - - - - - - - - - - - - -
Florida - 294 376 72 6 1 749 455 793 151 39 35 4 1,477 455 1,087 527 111 41 5 2,226
Georgia 23 162 410 101 20 1 717 2,239 689 176 35 - 18 3,157 2,262 851 586 136 20 19 3,874
Hawaii - - - 6 - - 6 - 55 35 7 5 - 102 - 55 35 13 5 - 108
Idaho 244 278 - - - - 522 1,038 520 57 17 6 9 1,647 1,282 798 57 17 6 9 2,169
Illinois 593 656 89 - - 16 1,354 1,371 270 - - - - 1,641 1,964 926 89 - - 16 2,995
Indiana 2/ 95 488 101 10 12 - 706 450 646 114 1 - - 1,211 545 1,134 215 11 12 - 1,917
Iowa 19 333 263 10 3 - 628 1,221 787 41 - - - 2,049 1,240 1,120 304 10 3 - 2,677
Kansas 330 289 24 - - - 643 1,737 782 61 - - - 2,580 2,067 1,071 85 - - - 3,223
Kentucky 13 211 309 16 4 - 553 626 728 258 40 63 14 1,729 639 939 567 56 67 14 2,282
Louisiana 21 198 239 16 2 - 476 314 606 114 11 1 - 1,046 335 804 353 27 3 - 1,522
Maine 138 116 39 6 - - 299 192 425 172 1 - 4 794 330 541 211 7 - 4 1,093
Maryland 30 38 51 20 30 15 184 107 118 196 7 13 19 460 137 156 247 27 43 34 644
Massachusetts 7 25 32 9 13 5 91 46 51 52 - 17 - 166 53 76 84 9 30 5 257
Michigan 453 - - - - 155 608 2,015 - - - - 119 2,134 2,468 - - - - 274 2,742
Minnesota 236 131 199 14 28 14 622 684 1,249 548 41 2 - 2,524 920 1,380 747 55 30 14 3,146
Mississippi 27 321 96 16 24 6 490 971 435 268 - 10 4 1,688 998 756 364 16 34 10 2,178
Missouri 137 210 374 - 1 - 722 577 1,252 487 22 33 50 2,421 714 1,462 861 22 34 50 3,143
Montana 969 161 - - - - 1,130 2,056 500 56 5 - - 2,617 3,025 661 56 5 - - 3,747
Nebraska 103 263 54 - - - 420 1,896 404 9 - - - 2,309 1,999 667 63 - - - 2,729
Nevada 345 42 30 - 5 21 443 1,077 223 76 8 1 34 1,419 1,422 265 106 8 6 55 1,862
New Hampshire 34 75 32 4 3 - 148 44 158 187 12 2 4 407 78 233 219 16 5 4 555
New Jersey - 6 25 10 8 16 65 20 79 98 12 33 13 255 20 85 123 22 41 29 320
New Mexico 329 424 90 - - 1 844 1,054 509 120 - - 26 1,709 1,383 933 210 - - 27 2,553
New York 299 218 288 - 5 31 841 595 672 182 35 5 9 1,498 894 890 470 35 10 40 2,339
North Carolina 24 68 257 79 90 25 543 152 869 754 67 29 82 1,953 176 937 1,011 146 119 107 2,496
North Dakota 417 102 - - - - 519 1,996 92 1 - - - 2,089 2,413 194 1 - - - 2,608
Ohio 45 140 443 30 48 17 723 865 652 111 22 3 - 1,653 910 792 554 52 51 17 2,376
Oklahoma 92 432 129 30 1 - 684 1,410 575 101 4 - - 2,090 1,502 1,007 230 34 1 - 2,774
Oregon 93 271 177 7 7 - 555 1,234 900 400 20 35 23 2,612 1,327 1,171 577 27 42 23 3,167
Pennsylvania 1,097 - - - - - 1,097 1,782 - - - - - 1,782 2,879 - - - - - 2,879
Rhode Island - - - 13 5 1 19 11 32 5 - - - 48 11 32 5 13 5 1 67
South Carolina 581 - - - - - 581 1,106 - - - - - 1,106 1,687 - - - - - 1,687
South Dakota 602 - - - - - 602 2,186 - - - - - 2,186 2,788 - - - - - 2,788
Tennessee 23 164 475 - 21 6 689 671 659 163 13 8 - 1,514 694 823 638 13 29 6 2,203
Texas 695 708 536 33 44 43 2,059 3,175 2,510 477 21 3 - 6,186 3,870 3,218 1,013 54 47 43 8,245
Utah 328 227 129 30 12 - 726 299 489 151 - 13 15 967 627 716 280 30 25 15 1,693
Vermont 92 117 70 - - 1 280 32 187 89 3 1 7 319 124 304 159 3 1 8 599
Virginia 53 224 343 31 16 - 667 839 327 118 5 - 3 1,292 892 551 461 36 16 3 1,959
Washington 8 223 170 39 28 - 468 796 848 326 9 - - 1,979 804 1,071 496 48 28 - 2,447
West Virginia 24 196 98 8 13 14 353 535 402 64 - 6 37 1,044 559 598 162 8 19 51 1,397
Wisconsin 478 - - - - - 478 2,461 - - - - - 2,461 2,939 - - - - - 2,939
Wyoming 483 315 19 - - - 817 1,448 395 81 27 - 10 1,961 1,931 710 100 27 - 10 2,778
U.S. Total 10,644 9,853 7,439 965 728 480 30,109 45,884 25,397 8,435 719 557 764 81,756 56,528 35,250 15,874 1,684 1,285 1,244 111,865
Puerto Rico - 4 21 1 3 1 30 4 22 4 - - - 30 4 26 25 1 3 1 60
Grand Total 10,644 9,857 7,460 966 731 481 30,139 45,888 25,419 8,439 719 557 764 81,786 56,532 35,276 15,899 1,685 1,288 1,245 111,925

October 2009
Sheet 2 OF 2
Table HM-42

STATE VOLUME-SERVICE FLOW RATIO (V/SF)
INTERSTATE SYSTEM OTHER TOTAL
< 0.21 0.21-0.40 0.41-0.70 0.71-0.79 0.80-0.95 > 0.95 TOTAL < 0.21 0.21-0.40 0.41-0.70 0.71-0.79 0.80-0.95 > 0.95 TOTAL < 0.21 0.21-0.40 0.41-0.70 0.71-0.79 0.80-0.95 > 0.95 TOTAL
Alabama - 52 118 65 58 74 367 86 309 269 32 19 32 747 86 361 387 97 77 106 1,114
Alaska 9 33 24 - 3 - 69 20 21 20 4 5 7 77 29 54 44 4 8 7 146
Arizona 4 39 58 10 21 56 188 39 147 167 18 61 52 484 43 186 225 28 82 108 672
Arkansas - 33 80 16 40 38 207 73 88 63 16 17 5 262 73 121 143 32 57 43 469
California 2 55 181 154 344 443 1,179 64 248 557 203 464 205 1,741 66 303 738 357 808 648 2,920
Colorado 7 52 82 27 47 54 269 97 189 356 17 54 31 744 104 241 438 44 101 85 1,013
Connecticut - 13 88 63 85 54 303 9 104 191 50 58 46 458 9 117 279 113 143 100 761
Delaware 2 4 25 2 8 - 41 11 28 67 6 9 5 126 13 32 92 8 17 5 167
Dist. of Columbia - - 2 2 7 2 13 1 10 34 6 11 7 69 1 10 36 8 18 9 82
Florida 9 20 345 131 94 119 718 96 325 616 81 164 89 1,371 105 345 961 212 258 208 2,089
Georgia - 36 248 65 104 73 526 340 482 230 10 4 31 1,097 340 518 478 75 108 104 1,623
Hawaii 2 8 15 10 8 5 48 7 79 67 13 11 8 185 9 87 82 23 19 13 233
Idaho 5 36 18 11 6 15 91 22 40 26 2 2 3 95 27 76 44 13 8 18 186
Illinois 69 202 194 61 158 129 813 279 547 867 32 135 25 1,885 348 749 1,061 93 293 154 2,698
Indiana 2/ 10 192 153 33 50 25 463 83 202 182 29 17 7 520 93 394 335 62 67 32 983
Iowa 2 22 69 17 36 6 152 163 160 71 11 - - 405 165 182 140 28 36 6 557
Kansas 41 44 80 14 11 24 214 117 97 54 12 11 18 309 158 141 134 26 22 42 523
Kentucky - 4 74 5 69 57 209 31 153 143 17 34 9 387 31 157 217 22 103 66 596
Louisiana 2 31 142 40 50 52 317 100 210 170 27 75 77 659 102 241 312 67 125 129 976
Maine 12 31 23 1 1 - 68 11 76 37 2 4 - 130 23 107 60 3 5 - 198
Maryland 7 11 74 50 105 52 299 22 100 286 35 61 22 526 29 111 360 85 166 74 825
Massachusetts 2 54 222 34 57 107 476 62 381 507 98 143 26 1,217 64 435 729 132 200 133 1,693
Michigan 202 - - - - 432 634 712 - - - - 663 1,375 914 - - - - 1,095 2,009
Minnesota 5 7 51 20 79 120 282 57 119 169 74 46 70 535 62 126 220 94 125 190 817
Mississippi 1 62 83 4 40 18 208 100 148 116 14 38 37 453 101 210 199 18 78 55 661
Missouri 25 63 166 57 65 77 453 76 254 303 68 53 51 805 101 317 469 125 118 128 1,258
Montana 26 36 - - - - 62 17 30 18 - - - 65 43 66 18 - - - 127
Nebraska 2 14 20 10 8 7 61 61 95 98 11 8 3 276 63 109 118 21 16 10 337
Nevada 22 18 17 11 23 34 125 15 33 47 8 17 24 144 37 51 64 19 40 58 269
New Hampshire 3 13 33 9 18 - 76 18 55 57 15 14 6 165 21 68 90 24 32 6 241
New Jersey - 13 119 41 50 142 365 47 299 513 125 161 243 1,388 47 312 632 166 211 385 1,753
New Mexico 24 47 55 4 6 19 155 81 109 22 4 6 1 223 105 156 77 8 12 20 378
New York 48 165 252 126 74 196 861 202 540 757 113 126 239 1,977 250 705 1,009 239 200 435 2,838
North Carolina 5 25 198 103 119 133 583 88 216 286 62 90 79 821 93 241 484 165 209 212 1,404
North Dakota 19 22 11 - - - 52 30 17 20 - - - 67 49 39 31 - - - 119
Ohio 8 42 262 97 206 230 845 262 465 391 39 40 21 1,218 270 507 653 136 246 251 2,063
Oklahoma 15 68 73 29 29 34 248 118 131 78 19 11 8 365 133 199 151 48 40 42 613
Oregon 12 27 65 13 39 15 171 49 121 140 26 31 29 396 61 148 205 39 70 44 567
Pennsylvania 695 - - - - - 695 1,936 - - - - - 1,936 2,631 - - - - - 2,631
Rhode Island - 2 20 3 13 12 50 9 51 66 10 17 3 156 9 53 86 13 30 15 206
South Carolina 235 - - - - - 235 660 - - - - - 660 895 - - - - - 895
South Dakota 77 - - - - - 77 74 - - - - - 74 151 - - - - - 151
Tennessee 4 48 166 48 49 103 418 57 257 276 67 54 42 753 61 305 442 115 103 145 1,171
Texas 46 144 413 138 253 179 1,173 513 1,077 1,284 309 442 413 4,038 559 1,221 1,697 447 695 592 5,211
Utah 9 35 82 10 51 25 212 14 62 98 21 18 40 253 23 97 180 31 69 65 465
Vermont 4 16 19 1 - - 40 7 15 20 5 4 2 53 11 31 39 6 4 2 93
Virginia 19 53 207 56 88 26 449 121 302 446 36 41 52 998 140 355 653 92 129 78 1,447
Washington 2 39 164 30 56 7 298 83 214 212 41 51 20 621 85 253 376 71 107 27 919
West Virginia - 92 93 9 5 1 200 39 102 70 4 2 5 222 39 194 163 13 7 6 422
Wisconsin 265 - - - - - 265 991 - - - - - 991 1,256 - - - - - 1,256
Wyoming 47 48 3 - - - 98 46 28 5 - 1 - 80 93 76 8 - 1 - 178
U.S. Total 2,005 2,071 4,887 1,630 2,633 3,195 16,421 8,216 8,736 10,472 1,792 2,630 2,756 34,602 10,221 10,807 15,359 3,422 5,263 5,951 51,023
Puerto Rico 2 53 114 23 32 9 233 12 30 37 4 19 13 115 14 83 151 27 51 22 348
Grand Total 2,007 2,124 5,001 1,653 2,665 3,204 16,654 8,228 8,766 10,509 1,796 2,649 2,769 34,717 10,235 10,890 15,510 3,449 5,314 5,973 51,371

1/ In 2001, updated capacity (service flow) calculation procedures were instituted in the HPMS data reporting process. The procedures are based on the Highway Capacity Manual 2000, published by the Transportation Research Board. For multilane facilities volume-service flow ratio is determined by dividing the peak traffic in the peak direction by the capacity. For all other facilities the ratio is determined by dividing the peak traffic by the capacity. Peak traffic is estimated as AADT *K, where K is the design hour volume (30th highest hour) as a percent of AADT. Some differences from other tables may be noted because these are estimated from sample data and do not include samples entirely on structures.

2/ Excludes 788 miles of Federal agency owned roads.

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Updated: 01/03/2012

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