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FHWA Home / Policy & Governmental Affairs / Highway Policy Information / Highway Statistics Series / 2023 / Table HM-47B - Highway Statistics 2023

Highway Statistics Series

Highway Statistics 2023


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NATIONAL HIGHWAY SYSTEM LENGTH - 2023
MILES BY MEASURED PAVEMENT ROUGHNESS - RURAL

JANUARY 2025

Table HM-47B
(Sheet 1 of 2)
STATE INTERNATIONAL ROUGHNESS INDEX (IRI) (1)
INTERSTATE SYSTEM OTHER TOTAL
NOT REPORTED (2) < 95 95-170 > 170 TOTAL REPORTED NOT REPORTED (2) < 95 95-170 > 170 TOTAL REPORTED NOT REPORTED (2) < 95 95-170 > 170 TOTAL REPORTED
Alabama 0 522 39 10 570 4 1,758 224 22 2,004 5 2,280 263 31 2,575
Alaska - 544 349 109 1,001 278 351 215 143 710 278 895 564 252 1,711
Arizona 2 732 134 47 913 3 700 402 95 1,197 5 1,432 535 142 2,109
Arkansas - 379 56 11 445 - 1,366 509 66 1,942 - 1,745 565 77 2,387
California 1 685 302 78 1,065 32 2,496 1,309 257 4,062 33 3,181 1,611 335 5,127
Colorado - 392 210 47 648 - 1,675 767 134 2,576 - 2,067 977 181 3,224
Connecticut - 28 1 0 30 - 89 58 9 156 - 117 59 9 185
Delaware - - - - - 2 114 21 1 136 2 114 21 1 136
District of Columbia - - - - - - - - - - - - - - -
Florida 4 687 25 1 713 2 2,376 373 30 2,779 7 3,063 397 31 3,492
Georgia - 485 49 4 538 - 2,581 632 35 3,248 - 3,066 681 39 3,786
Hawaii - - - - - 1 34 35 10 79 1 34 35 10 79
Idaho 1 466 49 6 521 1 1,334 325 39 1,698 2 1,800 374 44 2,218
Illinois - 1,089 123 16 1,228 1 1,505 760 185 2,449 1 2,593 883 201 3,677
Indiana 0 645 91 16 752 4 1,454 262 21 1,738 4 2,099 354 37 2,490
Iowa - 503 98 11 611 14 1,973 1,195 241 3,410 14 2,476 1,293 252 4,021
Kansas 0 567 69 4 639 1 2,698 301 33 3,031 2 3,264 370 37 3,671
Kentucky 2 642 58 9 710 11 1,375 238 26 1,638 12 2,017 296 35 2,348
Louisiana 4 308 192 24 524 2 528 459 110 1,097 6 836 651 134 1,621
Maine - 271 7 1 279 1 646 117 38 800 1 917 124 38 1,080
Maryland - 122 18 2 142 1 335 47 9 390 1 457 65 11 533
Massachusetts - 57 4 1 63 0 290 121 17 428 0 348 125 18 491
Michigan 20 467 63 12 542 36 2,108 298 44 2,450 56 2,575 361 56 2,992
Minnesota - 512 59 3 574 8 2,474 828 116 3,419 8 2,987 887 119 3,993
Mississippi - 505 62 10 578 0 1,208 505 108 1,821 0 1,713 568 119 2,399
Missouri - 775 57 9 841 1 2,397 511 49 2,957 1 3,171 569 59 3,799
Montana - 971 118 17 1,105 - 1,976 725 86 2,786 - 2,947 842 102 3,892
Nebraska - 376 37 2 415 1 1,689 797 175 2,661 1 2,064 834 178 3,076
Nevada - 439 15 2 457 0 1,373 181 13 1,567 0 1,812 197 15 2,024
New Hampshire - 120 8 1 129 0 324 49 10 382 0 444 57 10 511
New Jersey - 39 6 0 45 - 159 29 4 192 - 198 35 5 237
New Mexico 0 690 130 24 844 1 1,186 471 92 1,749 1 1,876 601 116 2,593
New York 8 655 126 17 798 36 1,505 640 90 2,235 43 2,159 767 107 3,033
North Carolina 4 749 46 8 803 23 1,897 636 51 2,583 27 2,646 682 59 3,387
North Dakota - 472 35 2 510 - 2,457 432 57 2,946 - 2,929 467 60 3,456
Ohio 1 573 63 6 642 1 1,462 400 40 1,902 1 2,035 463 46 2,544
Oklahoma 7 560 71 11 642 22 1,455 699 134 2,288 29 2,015 770 145 2,930
Oregon 0 448 43 3 495 1 2,014 571 71 2,657 1 2,463 615 75 3,152
Pennsylvania - 907 131 28 1,066 2 1,335 516 89 1,941 2 2,243 647 118 3,007
Rhode Island - 17 1 0 18 1 35 47 24 107 1 52 48 24 125
South Carolina 463 - - - - 5 991 397 45 1,434 468 991 397 45 1,434
South Dakota - 559 31 2 591 - 2,217 607 65 2,890 - 2,776 638 67 3,481
Tennessee 0 603 37 4 644 1 1,329 324 61 1,714 1 1,932 361 65 2,358
Texas 1 1,653 292 21 1,965 84 6,117 2,030 167 8,313 85 7,769 2,322 188 10,279
Utah - 604 78 3 685 0 791 370 23 1,184 0 1,394 448 26 1,868
Vermont 0 236 17 2 255 1 239 56 12 307 1 474 73 15 562
Virginia - 460 44 3 507 - 1,096 526 39 1,661 - 1,556 570 42 2,168
Washington - 317 73 17 407 1 1,172 647 87 1,906 1 1,489 720 104 2,313
West Virginia - 271 43 6 320 1 541 410 71 1,023 1 812 453 78 1,343
Wisconsin 2 419 84 7 510 13 2,048 909 186 3,143 15 2,467 993 193 3,653
Wyoming - 694 102 12 807 55 1,561 338 14 1,913 55 2,255 439 26 2,720
U.S. Total 521 24,213 3,745 630 28,588 650 70,835 23,320 3,544 97,700 1,170 95,048 27,065 4,175 126,288
Puerto Rico 4 17 17 16 50 0 5 36 27 67 4 22 52 43 117
Grand Total 525 24,231 3,761 646 28,638 650 70,839 23,356 3,571 97,767 1,175 95,070 27,117 4,218 126,405

NATIONAL HIGHWAY SYSTEM LENGTH - 2023
MILES BY MEASURED PAVEMENT ROUGHNESS - URBAN

JANUARY 2025

TABLE HM-47b SHEET 2 OF 2
STATE INTERNATIONAL ROUGHNESS INDEX (IRI) (1)
INTERSTATE SYSTEM OTHER TOTAL
NOT REPORTED (2) < 95 95-170 > 170 TOTAL REPORTED NOT REPORTED (2) < 95 95-170 > 170 TOTAL REPORTED NOT REPORTED (2) < 95 95-170 > 170 TOTAL REPORTED
Alabama 1 367 49 17 432 9 952 271 58 1,281 9 1,319 320 74 1,713
Alaska - 62 16 1 79 1 77 59 24 160 1 138 75 26 238
Arizona 6 202 35 7 243 10 349 334 148 831 16 551 369 155 1,075
Arkansas - 236 70 17 323 1 355 215 115 685 1 591 285 132 1,008
California 0 630 490 127 1,247 48 1,354 2,847 3,720 7,920 48 1,984 3,337 3,846 9,167
Colorado - 161 120 23 304 0 473 606 302 1,381 0 634 726 325 1,685
Connecticut - 265 47 5 317 1 410 404 144 958 1 675 451 149 1,275
Delaware 0 26 11 3 40 4 155 75 24 253 4 180 86 27 294
District of Columbia 8 1 1 1 4 3 2 16 101 119 12 3 17 102 122
Florida 6 681 82 9 772 10 3,026 1,239 296 4,560 16 3,707 1,321 305 5,332
Georgia - 594 104 11 709 - 1,872 727 157 2,756 - 2,466 831 168 3,465
Hawaii - 19 27 9 55 4 103 123 90 317 4 122 150 99 371
Idaho 0 81 10 1 92 9 145 72 28 244 9 226 82 29 336
Illinois - 743 170 45 958 1 1,034 1,291 791 3,116 1 1,778 1,461 835 4,074
Indiana 2 385 92 15 492 30 464 157 35 656 33 849 249 50 1,148
Iowa 2 114 53 8 175 9 306 428 194 929 10 420 481 202 1,103
Kansas 3 185 43 6 234 32 282 131 55 468 35 467 174 61 702
Kentucky 0 176 46 11 232 49 406 212 55 673 49 581 258 66 905
Louisiana 3 212 146 56 414 85 330 382 332 1,044 88 543 528 387 1,458
Maine - 79 7 1 87 1 79 48 32 159 1 158 55 33 246
Maryland 0 257 56 23 336 11 619 348 326 1,293 11 875 404 349 1,629
Massachusetts 1 441 50 13 504 52 681 862 751 2,294 53 1,123 912 763 2,799
Michigan 31 473 132 40 645 516 832 898 486 2,217 547 1,306 1,030 526 2,862
Minnesota 2 263 69 6 338 1 589 281 49 919 3 852 350 56 1,257
Mississippi - 198 44 12 254 5 429 372 191 992 5 626 416 203 1,245
Missouri - 441 85 17 544 3 761 433 188 1,383 3 1,203 519 205 1,926
Montana - 77 8 2 87 - 99 70 38 206 - 176 78 39 293
Nebraska - 51 17 1 69 5 118 163 177 457 5 168 180 178 526
Nevada - 123 35 4 162 0 233 137 48 418 0 356 171 53 580
New Hampshire - 94 2 0 96 - 227 71 26 324 - 321 74 26 420
New Jersey - 303 59 24 387 0 1,008 727 602 2,337 0 1,312 786 626 2,724
New Mexico - 124 25 7 155 4 175 142 59 376 4 299 167 66 532
New York 15 580 251 81 912 128 1,063 1,455 1,376 3,894 143 1,644 1,707 1,456 4,807
North Carolina 13 512 83 17 611 35 685 766 209 1,659 49 1,197 849 225 2,271
North Dakota - 52 9 0 61 1 87 78 39 204 1 139 87 39 265
Ohio 1 755 154 28 937 15 997 790 416 2,202 16 1,752 943 444 3,140
Oklahoma 1 190 76 16 282 9 319 252 96 667 11 509 327 112 949
Oregon - 194 34 6 234 15 394 352 173 919 15 588 387 178 1,153
Pennsylvania - 599 154 45 797 3 1,139 1,444 837 3,420 3 1,737 1,597 883 4,217
Rhode Island 0 47 4 1 52 7 102 145 168 415 7 149 149 168 467
South Carolina 388 - - - - 7 658 525 124 1,306 394 658 525 124 1,306
South Dakota - 67 19 1 88 3 54 68 32 154 3 121 87 33 241
Tennessee 0 495 53 9 557 3 1,237 575 230 2,042 4 1,731 628 239 2,598
Texas 6 956 481 68 1,505 80 2,638 2,525 1,379 6,542 86 3,594 3,006 1,447 8,047
Utah 0 179 69 6 253 2 404 239 59 702 2 583 308 65 956
Vermont 0 56 8 0 64 3 46 26 14 86 3 102 34 15 150
Virginia - 467 127 16 610 1 729 833 302 1,864 1 1,196 960 318 2,474
Washington 0 263 81 13 356 12 613 719 540 1,872 12 876 800 553 2,228
West Virginia - 181 46 9 236 3 195 166 45 406 3 376 213 53 642
Wisconsin 4 219 127 17 362 46 445 815 636 1,896 50 664 941 653 2,258
Wyoming - 75 22 8 106 6 95 54 25 174 6 171 76 33 280
U.S. Total 495 13,952 3,997 862 18,811 1,283 29,843 25,968 16,338 72,150 1,778 43,795 29,966 17,200 90,960
Puerto Rico 6 53 109 63 225 8 21 130 245 396 14 74 239 308 621
Grand Total 501 14,004 4,106 925 19,035 1,291 29,864 26,098 16,583 72,546 1,792 43,868 30,205 17,508 91,581
  1. Data are reported as the International Roughness Index (IRI) in inches per mile. Reference: World Bank Technical Paper Number 46, 1986. Lower IRI represents smoother riding roadways. To obtain a comprehensive assessment of pavement condition, additional measures of pavement distress are needed.
  2. May include sections entirely on structures and unpaved miles.

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