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FHWA Home / Policy & Governmental Affairs / Highway Policy Information / Highway Statistics Series / 2024 / Table HM-47

Highway Statistics Series

Highway Statistics 2024


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NATIONAL HIGHWAY SYSTEM LENGTH - 2024
  MILES BY MEASURED PAVEMENT ROUGHNESS - RURAL

November 2025

Table HM-47
(Sheet 1 of 4)
STATE INTERNATIONAL ROUGHNESS INDEX (IRI) (1)
INTERSTATE SYSTEM OTHER
NOT REPORTED (2) < 60 60-94 95-119 120-144 145-170 171-194 195-220 > 220 TOTAL REPORTED NOT REPORTED (2) < 60 60-94 95-119 120-144 145-170 171-194 195-220 > 220 TOTAL REPORTED
Alabama 4 465 54 20 10 6 4 2 3 565 11 1,080 653 144 68 33 13 7 7 2,005
Alaska 0 204 332 168 109 78 46 29 34 998 279 124 232 80 65 55 35 29 84 705
Arizona 1 541 223 75 38 23 12 7 13 933 3 313 400 188 124 80 42 29 37 1,213
Arkansas - 252 111 32 16 9 6 1 1 430 47 602 751 244 126 70 29 17 15 1,853
California - 410 427 143 94 53 29 18 26 1,200 31 864 1,652 700 379 228 107 63 92 4,086
Colorado - 60 302 124 54 30 15 13 20 619 - 508 1,101 435 233 113 55 35 48 2,527
Connecticut - 21 7 1 0 0 - - 0 30 - 28 60 33 17 9 4 3 2 156
Delaware - - - - - - - - - - 13 48 72 16 4 2 0 0 0 143
District of Columbia - - - - - - - - - - - - - - - - - - - -
Florida - 539 92 17 9 3 1 1 0 661 2 1,357 928 233 89 37 15 6 7 2,672
Georgia - 427 156 40 12 8 3 1 2 649 - 1,549 1,447 427 170 57 22 9 8 3,689
Hawaii - 0 1 1 2 1 0 0 0 6 1 5 24 17 9 6 3 2 4 69
Idaho 0 303 151 32 17 8 3 1 1 517 0 491 680 279 145 64 29 16 15 1,719
Illinois - 829 266 71 30 14 7 6 4 1,228 1 720 784 375 243 142 77 46 61 2,449
Indiana 4 407 240 82 43 25 11 7 7 823 5 768 601 199 101 58 23 8 6 1,765
Iowa - 227 257 64 24 14 5 3 3 597 7 853 1,115 596 363 212 97 62 60 3,358
Kansas 0 409 143 38 24 7 2 1 0 624 2 1,688 980 183 74 36 17 8 10 2,995
Kentucky 2 523 147 34 19 11 4 1 1 741 1 787 554 135 48 21 7 3 3 1,558
Louisiana 5 172 136 92 68 33 13 5 2 523 18 114 386 228 146 101 53 32 36 1,095
Maine 0 210 33 9 3 1 0 0 0 256 3 371 269 61 29 19 10 9 17 785
Maryland 0 64 52 12 4 2 1 1 1 136 2 212 183 37 12 7 3 2 5 460
Massachusetts - 37 12 2 1 1 0 0 0 53 0 86 186 63 33 17 8 5 4 402
Michigan 4 281 184 29 20 14 7 3 3 540 8 1,331 759 188 76 34 17 10 17 2,433
Minnesota - 259 244 47 13 4 1 0 1 569 - 1,271 1,192 492 244 116 48 29 28 3,419
Mississippi - 358 134 32 19 12 7 3 2 567 - 571 679 249 135 94 45 23 27 1,824
Missouri - 617 146 37 17 11 8 3 2 841 0 1,353 1,056 307 131 61 26 13 10 2,958
Montana - 521 450 78 32 13 6 2 4 1,105 - 728 1,170 469 215 106 40 25 30 2,783
Nebraska - 220 149 22 9 6 4 1 0 410 0 869 1,149 357 155 76 36 17 21 2,678
Nevada - 416 26 6 3 2 1 - 0 456 - 964 408 115 47 19 7 3 3 1,566
New Hampshire - 105 16 4 3 1 0 0 - 129 - 213 125 25 9 4 3 2 1 382
New Jersey - 16 21 5 2 1 0 0 - 45 - 94 89 29 12 6 4 2 3 238
New Mexico 0 480 171 67 41 28 18 11 11 825 0 507 617 256 139 84 40 24 27 1,695
New York 14 374 306 63 33 20 8 3 3 809 42 336 1,164 372 182 100 43 27 23 2,247
North Carolina 0 568 180 31 13 7 4 2 3 808 8 727 1,146 428 181 66 26 12 14 2,600
North Dakota - 275 181 32 12 3 1 1 1 505 - 1,287 1,163 284 116 44 18 11 19 2,942
Ohio - 394 156 38 18 10 3 2 2 624 1 737 721 216 102 45 20 11 10 1,862
Oklahoma 12 303 251 52 22 11 6 4 2 652 67 564 868 376 187 104 53 35 50 2,238
Oregon - 313 145 31 11 6 2 1 1 509 0 633 1,357 392 163 69 31 15 12 2,673
Pennsylvania - 656 341 81 36 18 9 6 9 1,156 - 482 1,016 355 160 77 37 22 30 2,180
Rhode Island - 12 3 1 0 - - - - 15 1 21 25 9 11 10 9 5 5 95
South Carolina 1 291 116 25 17 7 3 2 1 462 4 299 688 234 115 54 24 10 9 1,434
South Dakota - 297 260 22 8 3 1 1 0 591 3 1,043 1,186 371 156 67 25 17 22 2,886
Tennessee 2 586 56 15 10 5 3 1 1 678 189 716 610 181 92 51 28 16 25 1,720
Texas 14 819 821 194 68 29 12 5 4 1,953 64 2,879 3,211 1,235 583 252 96 45 34 8,334
Utah - 387 214 48 22 6 2 1 1 680 18 297 504 199 94 42 14 5 4 1,159
Vermont 1 189 58 10 6 2 1 1 1 268 1 110 134 33 15 9 5 2 5 313
Virginia - 263 187 30 11 5 3 1 2 502 - 266 811 319 143 61 22 12 9 1,643
Washington - 200 103 40 23 15 8 9 9 407 1 401 744 391 183 87 40 27 31 1,905
West Virginia 0 150 162 27 15 10 4 2 2 371 1 102 483 224 130 71 36 20 23 1,088
Wisconsin 0 287 134 58 24 13 5 2 1 525 9 1,377 801 478 288 164 84 48 59 3,298
Wyoming - 528 177 51 27 13 6 3 2 807 55 741 819 217 88 32 9 4 3 1,913
U.S. Total 64 16,267 8,536 2,233 1,113 603 296 166 185 29,398 901 33,486 37,748 13,476 6,633 3,371 1,535 885 1,077 98,211
Puerto Rico 0 3 18 10 7 6 6 4 6 61 0 0 8 10 14 12 7 7 14 72
Grand Total 65 16,270 8,554 2,243 1,120 608 302 170 192 29,459 901 33,486 37,755 13,486 6,647 3,383 1,543 893 1,091 98,283

NATIONAL HIGHWAY SYSTEM LENGTH - 2024
  MILES BY MEASURED PAVEMENT ROUGHNESS - RURAL

November 2025

Table HM-47
(Sheet 2 of 4)
STATE INTERNATIONAL ROUGHNESS INDEX (IRI) (1)
TOTAL RURAL NHS
NOT REPORTED (2) < 60 60-94 95-119 120-144 145-170 171-194 195-220 > 220 TOTAL REPORTED
Alabama 15 1,546 708 163 78 39 17 9 10 2,570
Alaska 280 328 563 248 174 133 81 58 118 1,703
Arizona 4 854 623 264 162 103 54 36 50 2,145
Arkansas 47 854 862 275 142 79 35 18 16 2,283
California 31 1,273 2,079 843 473 282 136 81 118 5,285
Colorado - 568 1,403 559 287 143 70 48 69 3,146
Connecticut - 49 67 34 17 9 4 3 2 185
Delaware 13 48 72 16 4 2 0 0 0 143
District of Columbia - - - - - - - - - -
Florida 2 1,895 1,020 250 98 40 16 7 7 3,333
Georgia - 1,975 1,602 467 182 66 25 11 10 4,338
Hawaii 1 5 24 18 10 7 3 2 4 74
Idaho 0 794 831 312 162 71 33 17 16 2,236
Illinois 1 1,550 1,050 446 273 156 85 52 66 3,677
Indiana 10 1,175 840 282 145 83 34 16 13 2,589
Iowa 7 1,080 1,371 660 387 226 103 65 63 3,955
Kansas 3 2,096 1,122 221 98 43 19 9 11 3,619
Kentucky 3 1,310 701 169 68 31 11 5 4 2,299
Louisiana 22 286 522 320 214 134 66 37 39 1,618
Maine 3 581 302 70 32 20 10 9 17 1,041
Maryland 2 276 235 48 16 8 4 3 5 596
Massachusetts 0 123 198 65 33 18 9 5 5 455
Michigan 12 1,611 943 217 96 48 24 13 20 2,973
Minnesota - 1,530 1,435 540 257 120 49 30 28 3,989
Mississippi - 929 813 282 154 106 52 26 29 2,392
Missouri 0 1,969 1,203 343 149 73 34 17 12 3,799
Montana - 1,249 1,620 547 247 119 46 26 33 3,888
Nebraska 0 1,089 1,298 379 163 82 39 18 21 3,089
Nevada - 1,380 434 122 50 21 9 3 3 2,022
New Hampshire - 317 141 29 12 5 3 2 1 511
New Jersey - 110 110 34 13 7 4 2 3 283
New Mexico 0 987 788 323 180 112 57 35 38 2,520
New York 56 710 1,470 435 214 120 51 30 26 3,056
North Carolina 9 1,295 1,326 459 194 73 29 14 17 3,408
North Dakota - 1,562 1,344 315 129 46 19 12 20 3,447
Ohio 1 1,131 877 255 120 56 23 13 11 2,485
Oklahoma 80 867 1,119 428 210 116 59 39 52 2,890
Oregon 0 947 1,502 423 174 75 33 16 12 3,182
Pennsylvania - 1,138 1,358 437 196 95 46 28 39 3,336
Rhode Island 1 33 27 9 12 10 9 5 5 110
South Carolina 5 590 805 259 133 60 28 12 10 1,896
South Dakota 3 1,340 1,446 393 164 70 26 17 22 3,477
Tennessee 191 1,303 666 197 102 56 30 17 27 2,398
Texas 78 3,698 4,032 1,429 651 281 107 50 38 10,287
Utah 18 684 718 247 116 48 16 5 4 1,840
Vermont 1 299 193 42 21 11 6 3 6 580
Virginia - 529 998 350 154 66 25 13 11 2,146
Washington 1 601 846 432 207 103 48 36 41 2,313
West Virginia 1 251 644 251 146 80 41 22 24 1,459
Wisconsin 9 1,664 936 536 312 177 89 49 60 3,823
Wyoming 55 1,270 997 268 115 45 14 7 5 2,720
U.S. Total 965 49,752 46,284 15,709 7,746 3,974 1,831 1,052 1,262 127,609
Puerto Rico 0 4 26 20 21 18 14 11 21 133
Grand Total 966 49,756 46,309 15,729 7,767 3,991 1,845 1,063 1,282 127,742

NATIONAL HIGHWAY SYSTEM LENGTH - 2024
  MILES BY MEASURED PAVEMENT ROUGHNESS - URBAN

November 2025

Table HM-47
(Sheet 3 of 4)
STATE INTERNATIONAL ROUGHNESS INDEX (IRI) (1)
INTERSTATE SYSTEM OTHER
NOT REPORTED (2) < 60 60-94 95-119 120-144 145-170 171-194 195-220 > 220 TOTAL REPORTED NOT REPORTED (2) < 60 60-94 95-119 120-144 145-170 171-194 195-220 > 220 TOTAL REPORTED
Alabama 1 310 60 23 18 9 4 4 5 434 22 465 462 146 77 45 25 14 22 1,257
Alaska - 30 35 10 4 2 1 1 0 82 1 26 51 31 20 13 7 5 11 164
Arizona 2 128 70 17 7 4 2 2 2 233 12 168 191 125 111 81 51 36 51 815
Arkansas - 167 91 33 21 11 7 4 5 338 42 133 246 98 62 47 26 19 57 688
California 0 260 415 211 162 102 52 27 26 1,255 57 398 978 870 980 1,012 825 748 2,138 7,951
Colorado - 62 131 55 38 23 11 5 7 333 - 110 377 254 215 149 94 70 157 1,426
Connecticut - 146 117 29 13 6 2 1 2 317 1 107 297 188 137 82 51 34 64 959
Delaware 0 13 13 7 4 2 1 0 1 41 15 36 112 41 23 12 8 5 11 248
District of Columbia 1 - 2 2 2 1 1 1 1 11 4 1 1 2 5 9 10 13 77 119
Florida - 530 206 49 26 13 6 2 1 834 17 1,350 1,785 674 359 199 107 67 119 4,660
Georgia - 370 130 51 24 14 6 2 1 598 - 626 906 342 192 106 56 34 52 2,315
Hawaii - 5 13 9 7 7 5 2 1 49 4 31 78 49 39 39 27 18 46 327
Idaho 0 51 31 6 2 2 1 0 0 95 6 46 89 40 27 19 11 9 18 259
Illinois - 400 337 91 52 31 19 12 16 958 2 338 696 526 437 328 220 168 403 3,116
Indiana 6 218 123 60 39 24 12 6 4 487 21 190 217 94 56 34 19 12 13 634
Iowa 1 47 83 30 17 8 4 2 1 191 4 101 235 201 151 106 62 46 93 995
Kansas 3 135 63 24 15 7 4 2 1 250 24 155 147 64 47 32 22 15 22 503
Kentucky 2 137 57 23 15 10 7 2 3 253 45 186 252 116 63 37 22 15 22 712
Louisiana 3 128 87 52 50 44 25 13 14 414 63 115 219 147 133 122 88 73 170 1,067
Maine 0 75 26 5 2 1 0 - 0 109 3 40 43 19 14 14 9 5 14 158
Maryland 0 132 136 34 18 12 7 6 12 358 7 196 352 145 104 83 65 55 194 1,194
Massachusetts - 367 74 25 18 13 6 4 6 513 75 276 376 306 282 276 197 161 420 2,294
Michigan 1 250 260 69 45 26 16 11 15 694 481 333 574 393 296 215 142 115 229 2,297
Minnesota - 124 144 40 19 11 3 2 1 344 0 283 322 146 86 45 19 12 15 927
Mississippi - 159 52 15 14 11 6 4 4 264 - 162 290 158 116 80 51 36 101 994
Missouri 0 293 142 42 27 21 9 6 5 544 2 324 419 206 140 101 63 48 81 1,383
Montana - 54 24 4 3 1 0 0 1 87 - 33 63 35 21 19 11 10 19 210
Nebraska - 17 36 14 5 2 1 0 0 73 6 31 106 64 53 51 39 34 95 472
Nevada - 109 35 15 12 5 2 0 0 179 - 108 107 67 41 31 15 13 20 403
New Hampshire - 80 14 2 0 0 - - - 96 - 123 98 37 22 18 10 6 15 328
New Jersey - 171 129 32 19 14 8 5 8 387 0 428 564 276 225 204 146 125 330 2,298
New Mexico - 85 48 13 9 9 5 3 3 174 0 77 114 68 52 39 25 17 43 436
New York 42 237 345 121 75 50 33 21 40 921 157 160 881 622 481 379 272 252 855 3,902
North Carolina 0 342 188 45 23 11 7 5 5 625 23 192 526 379 264 158 83 58 76 1,737
North Dakota - 22 32 8 3 1 0 - - 66 2 31 61 35 26 17 13 8 16 207
Ohio 1 471 291 81 51 30 15 8 9 957 5 372 666 332 252 197 129 91 211 2,251
Oklahoma 9 94 116 44 23 15 7 4 4 308 16 72 209 119 81 57 31 27 44 640
Oregon - 121 67 14 9 4 3 1 1 220 5 125 244 150 124 84 56 39 92 914
Pennsylvania - 305 217 73 39 27 15 11 19 708 0 269 715 542 458 357 235 179 385 3,141
Rhode Island - 42 8 3 2 0 0 0 0 55 10 41 59 39 50 52 37 36 88 402
South Carolina 6 218 100 24 20 10 5 3 2 382 6 190 473 248 168 104 56 31 36 1,307
South Dakota - 20 50 10 4 2 1 1 - 88 10 13 37 25 22 19 12 9 10 146
Tennessee 0 389 80 23 13 6 3 2 4 521 274 479 566 219 132 86 48 32 64 1,625
Texas 11 359 580 248 156 89 39 20 11 1,500 135 765 1,856 1,141 814 596 369 283 683 6,506
Utah - 76 107 40 19 14 5 1 0 263 27 155 268 122 66 43 22 12 18 705
Vermont - 29 15 5 3 0 0 0 0 52 3 17 24 12 7 6 4 3 7 80
Virginia - 216 257 67 31 19 12 8 7 617 0 144 588 359 271 209 121 84 98 1,876
Washington - 135 122 47 23 13 6 4 6 356 15 190 416 279 239 197 140 113 297 1,870
West Virginia 0 67 73 17 12 8 4 2 1 185 2 20 127 70 45 31 18 13 21 345
Wisconsin - 98 125 58 38 22 7 3 2 353 20 166 273 252 240 229 162 133 319 1,774
Wyoming - 42 32 11 7 6 4 2 2 106 6 42 53 24 17 13 8 5 12 174
U.S. Total 91 8,338 5,992 2,033 1,258 771 398 226 263 19,278 1,634 10,439 18,808 10,900 8,345 6,482 4,337 3,450 8,455 71,213
Puerto Rico 2 7 51 41 29 27 20 14 33 222 10 2 20 33 48 58 54 51 144 411
Grand Total 92 8,345 6,043 2,074 1,287 798 418 240 296 19,500 1,644 10,441 18,828 10,933 8,393 6,540 4,390 3,501 8,599 71,624

NATIONAL HIGHWAY SYSTEM LENGTH - 2024
  MILES BY MEASURED PAVEMENT ROUGHNESS - URBAN

November 2025

Table HM-47
(Sheet 4 of 4)
STATE INTERNATIONAL ROUGHNESS INDEX (IRI) (1)
TOTAL URBAN NHS
NOT REPORTED (2) < 60 60-94 95-119 120-144 145-170 171-194 195-220 > 220 TOTAL REPORTED
Alabama 23 775 522 169 96 54 30 18 27 1,691
Alaska 1 56 86 41 24 15 8 6 11 246
Arizona 14 296 262 142 118 85 53 38 53 1,048
Arkansas 42 299 337 131 83 58 33 23 63 1,026
California 57 658 1,393 1,082 1,142 1,114 877 775 2,164 9,206
Colorado - 171 508 309 253 173 105 75 164 1,759
Connecticut 1 254 414 217 150 88 53 35 66 1,276
Delaware 15 49 124 48 27 13 9 6 12 289
District of Columbia 5 1 3 5 7 11 11 14 78 130
Florida 17 1,879 1,991 723 386 213 113 69 120 5,494
Georgia - 996 1,037 393 217 119 62 36 54 2,913
Hawaii 4 35 91 58 45 46 32 20 47 376
Idaho 6 97 120 46 29 21 13 10 18 354
Illinois 2 738 1,033 617 489 359 239 180 419 4,074
Indiana 27 408 340 155 95 58 31 18 17 1,121
Iowa 5 148 318 232 167 114 66 48 94 1,186
Kansas 27 290 210 88 61 39 25 16 23 753
Kentucky 47 323 309 139 78 47 29 18 24 965
Louisiana 66 244 306 200 183 165 113 86 184 1,481
Maine 4 115 70 25 15 14 9 5 14 268
Maryland 7 328 488 179 123 95 72 61 206 1,552
Massachusetts 75 643 449 331 301 289 204 164 426 2,807
Michigan 483 583 835 461 341 241 158 127 244 2,991
Minnesota 0 407 466 186 104 56 22 14 16 1,271
Mississippi - 322 342 173 129 90 57 40 105 1,258
Missouri 2 618 561 248 167 122 72 54 86 1,927
Montana - 87 87 39 24 20 11 10 20 297
Nebraska 6 48 142 77 57 53 39 34 95 546
Nevada - 218 142 82 54 36 17 14 20 583
New Hampshire - 202 112 39 23 18 10 6 15 425
New Jersey 0 599 693 308 245 218 154 130 338 2,685
New Mexico 0 162 162 81 61 48 29 20 46 610
New York 199 397 1,226 744 556 429 304 272 895 4,823
North Carolina 23 534 714 424 287 169 90 63 80 2,362
North Dakota 2 53 94 43 29 18 13 8 16 273
Ohio 6 844 957 413 304 227 144 99 220 3,208
Oklahoma 26 166 326 163 104 72 38 31 48 948
Oregon 5 246 310 165 133 88 59 40 93 1,134
Pennsylvania 0 574 932 616 497 385 250 191 404 3,849
Rhode Island 10 83 67 42 52 52 37 36 88 457
South Carolina 12 409 573 272 188 114 61 34 38 1,689
South Dakota 10 33 87 35 26 20 13 9 10 234
Tennessee 275 868 646 242 144 92 52 34 68 2,146
Texas 146 1,123 2,436 1,389 969 685 408 303 693 8,006
Utah 27 231 376 162 85 57 27 13 18 967
Vermont 3 46 39 17 10 6 4 3 8 132
Virginia 0 361 845 426 302 228 133 92 105 2,492
Washington 15 325 538 326 262 210 147 117 303 2,227
West Virginia 2 88 200 87 57 39 22 15 22 530
Wisconsin 20 264 398 310 278 250 169 136 321 2,127
Wyoming 6 85 85 35 24 18 11 7 14 280
U.S. Total 1,725 18,777 24,800 12,932 9,603 7,252 4,734 3,676 8,717 90,491
Puerto Rico 12 9 71 74 77 85 74 65 178 633
Grand Total 1,736 18,786 24,870 13,006 9,680 7,338 4,808 3,741 8,895 91,124

(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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