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

Highway Statistics Series

Highway Statistics 2023


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

November 19, 2024

INTERNATIONAL ROUGHNESS INDEX (IRI) (1)

Table HM-47 (Sheet 1 of 4)
STATE 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 - 466 56 20 12 7 4 3 3 570 4 1,095 664 140 59 25 10 7 5 2,004
Alaska - 189 356 167 104 77 47 27 35 1,001 278 135 216 81 72 62 40 32 72 710
Arizona 2 528 204 66 41 27 15 12 21 913 3 308 392 196 127 79 39 25 30 1,197
Arkansas - 255 124 31 17 8 5 2 3 445 - 564 802 285 150 74 32 17 17 1,942
California 1 281 404 148 99 56 31 20 27 1,065 32 839 1,658 705 379 226 106 61 90 4,062
Colorado - 68 324 121 55 34 19 14 14 648 - 557 1,118 427 222 118 60 38 36 2,576
Connecticut - 22 6 1 - - - - - 30 - 29 60 34 18 7 4 3 2 156
Delaware - - - - - - - - - - 2 45 69 15 4 1 - - - 136
District of Columbia - - - - - - - - - - - - - - - - - - - -
Florida 4 586 101 15 6 3 1 - - 713 2 1,417 959 237 92 43 16 6 7 2,779
Georgia - 338 147 31 11 6 2 1 1 538 - 1,260 1,321 401 165 66 20 8 7 3,248
Hawaii - - - - - - - - - - 1 6 28 19 9 7 4 2 4 79
Idaho 1 310 156 28 15 6 3 1 2 521 1 644 690 192 90 44 18 11 10 1,698
Illinois - 809 280 73 32 19 8 4 4 1,228 1 720 784 375 243 142 77 46 62 2,449
Indiana - 460 185 50 27 14 7 4 5 752 4 925 530 153 74 36 11 6 4 1,738
Iowa - 271 231 60 27 11 5 2 3 611 14 868 1,105 608 370 218 109 69 64 3,410
Kansas - 425 142 43 19 6 2 1 1 639 1 1,630 1,068 186 75 40 16 8 10 3,031
Kentucky 2 519 124 30 19 9 4 2 2 710 11 831 544 151 58 28 14 5 7 1,638
Louisiana 4 173 135 91 61 40 16 6 3 524 2 125 403 227 143 89 49 30 31 1,097
Maine - 231 41 5 2 1 - - - 279 1 373 273 65 32 20 13 8 16 800
Maryland - 67 55 11 5 2 - 1 1 142 1 182 152 30 10 7 3 2 4 390
Massachusetts - 44 13 2 1 1 1 - 1 63 - 102 188 66 36 19 7 5 5 428
Michigan 20 282 186 29 20 14 7 3 3 542 36 1,339 769 188 76 35 17 10 16 2,450
Minnesota - 289 223 39 13 6 2 1 - 574 8 1,239 1,235 483 225 120 57 34 26 3,419
Mississippi - 354 151 34 18 11 6 2 2 578 - 512 696 255 150 100 50 28 31 1,821
Missouri - 640 135 32 15 10 5 2 3 841 1 1,291 1,106 316 134 62 26 13 11 2,957
Montana - 559 412 74 32 12 4 1 11 1,105 - 737 1,239 444 194 86 40 20 26 2,786
Nebraska - 218 157 23 9 5 2 - - 415 1 756 933 399 251 147 72 49 54 2,661
Nevada - 409 29 8 5 2 1 1 1 457 - 950 423 115 48 19 8 3 3 1,567
New Hampshire - 104 16 6 2 - - - - 129 - 203 121 32 12 6 4 3 3 382
New Jersey - 20 18 4 1 1 - - - 45 - 87 72 16 8 5 2 1 2 192
New Mexico - 496 194 66 40 24 11 7 6 844 1 543 642 252 137 82 40 24 27 1,749
New York 8 372 282 69 36 21 8 5 4 798 36 358 1,147 366 177 97 43 25 22 2,235
North Carolina 4 571 178 27 13 6 4 2 3 803 23 762 1,135 409 163 64 24 12 15 2,583
North Dakota - 320 152 22 11 2 1 1 1 510 - 1,351 1,106 274 112 45 19 13 26 2,946
Ohio 1 420 153 39 16 8 3 2 1 642 1 707 755 244 106 50 21 11 8 1,902
Oklahoma 7 296 264 44 17 10 5 3 2 642 22 564 891 379 210 109 51 34 49 2,288
Oregon - 302 146 27 11 5 2 1 - 495 1 723 1,291 363 144 64 28 20 24 2,657
Pennsylvania - 583 324 73 38 20 11 7 11 1,066 2 447 889 303 147 66 35 21 34 1,941
Rhode Island - 15 2 - - - - - - 18 1 16 19 13 18 17 11 7 6 107
South Carolina 463 - - - - - - - - - 5 302 689 227 116 54 23 13 10 1,434
South Dakota - 327 232 20 7 4 1 1 - 591 - 1,042 1,176 374 163 70 31 18 17 2,890
Tennessee - 529 75 19 13 5 2 1 1 644 1 686 643 171 96 57 28 16 17 1,714
Texas 1 827 826 193 68 31 11 6 3 1,965 84 2,886 3,231 1,220 566 243 89 45 34 8,313
Utah - 389 215 53 18 6 2 - 1 685 - 287 504 214 108 48 12 6 5 1,184
Vermont - 181 55 10 6 2 1 1 1 255 1 107 131 32 15 9 5 2 5 307
Virginia - 270 190 31 9 4 2 1 - 507 - 260 836 324 141 60 23 9 7 1,661
Washington - 209 108 36 25 11 7 6 4 407 1 405 766 391 181 75 38 23 26 1,906
West Virginia - 134 136 23 13 7 3 2 1 320 1 103 438 217 130 63 35 19 17 1,023
Wisconsin 2 300 119 54 20 10 4 1 1 510 13 1,257 791 456 294 160 85 47 55 3,143
Wyoming - 526 168 57 32 13 6 4 2 807 55 743 818 225 84 29 8 4 3 1,913
U.S. Total 521 15,983 8,230 2,107 1,061 576 282 162 187 28,588 650 33,318 37,517 13,296 6,632 3,393 1,570 916 1,059 97,700
Puerto Rico 4 3 15 9 4 3 2 3 11 50 - - 5 12 12 12 7 6 14 67
Grand Total 525 15,986 8,245 2,116 1,065 580 284 164 198 28,638 650 33,318 37,522 13,307 6,644 3,405 1,576 922 1,073 97,767

NATIONAL HIGHWAY SYSTEM LENGTH - 2020
  MILES BY MEASURED PAVEMENT ROUGHNESS - RURAL

November 19, 2024

INTERNATIONAL ROUGHNESS INDEX (IRI) (1)

Table HM-47 (Sheet 2 of 4)
STATE TOTAL RURAL NHS
NOT REPORTED (2) < 60 60-94 95-119 120-144 145-170 171-194 195-220 > 220 TOTAL REPORTED
Alabama 5 1,561 720 160 71 32 14 9 8 2,575
Alaska 278 324 572 248 177 139 86 59 107 1,711
Arizona 5 836 596 261 168 106 54 37 51 2,109
Arkansas - 819 926 316 167 82 38 20 20 2,387
California 33 1,120 2,061 852 478 281 137 81 117 5,127
Colorado - 625 1,442 547 277 152 80 51 50 3,224
Connecticut - 52 66 35 18 7 4 3 2 185
Delaware 2 45 69 15 4 1 - - - 136
District of Columbia - - - - - - - - - -
Florida 7 2,003 1,060 253 98 46 17 6 7 3,492
Georgia - 1,598 1,468 432 177 73 22 9 8 3,786
Hawaii 1 6 28 19 9 7 4 2 4 79
Idaho 2 954 846 220 105 49 21 12 11 2,218
Illinois 1 1,529 1,064 447 275 161 85 51 66 3,677
Indiana 4 1,385 714 203 100 50 18 10 9 2,490
Iowa 14 1,139 1,337 668 396 229 114 71 67 4,021
Kansas 2 2,055 1,209 230 94 46 18 9 10 3,671
Kentucky 12 1,350 667 182 77 38 18 7 9 2,348
Louisiana 6 298 538 318 204 129 65 35 34 1,621
Maine 1 604 313 70 34 21 13 8 17 1,080
Maryland 1 249 207 42 15 8 3 3 5 533
Massachusetts - 147 201 68 37 20 8 5 5 491
Michigan 56 1,620 955 216 96 48 24 13 19 2,992
Minnesota 8 1,529 1,458 523 239 126 58 35 26 3,993
Mississippi - 866 847 289 168 111 56 30 33 2,399
Missouri 1 1,931 1,241 348 149 71 30 16 13 3,799
Montana - 1,296 1,652 518 226 98 43 21 38 3,892
Nebraska 1 974 1,090 423 259 152 74 49 54 3,076
Nevada - 1,360 452 123 53 21 9 3 3 2,024
New Hampshire - 306 137 38 13 6 4 3 3 511
New Jersey - 108 90 20 9 6 2 1 2 237
New Mexico 1 1,039 837 319 177 105 51 32 33 2,593
New York 43 730 1,430 435 214 118 51 29 26 3,033
North Carolina 27 1,333 1,313 436 176 69 27 14 17 3,387
North Dakota - 1,671 1,258 296 123 48 20 13 27 3,456
Ohio 1 1,126 908 282 122 59 24 12 10 2,544
Oklahoma 29 860 1,155 423 227 119 56 37 52 2,930
Oregon 1 1,026 1,437 390 155 69 30 20 24 3,152
Pennsylvania 2 1,029 1,213 376 185 86 46 28 44 3,007
Rhode Island 1 31 21 13 18 17 11 7 6 125
South Carolina 468 302 689 227 116 54 23 13 10 1,434
South Dakota - 1,369 1,407 394 170 74 31 19 17 3,481
Tennessee 1 1,215 717 190 109 62 30 17 18 2,358
Texas 85 3,712 4,057 1,414 634 274 100 51 37 10,279
Utah - 676 719 267 127 54 15 6 6 1,868
Vermont 1 288 187 42 21 10 6 3 6 562
Virginia - 530 1,026 356 150 64 25 10 7 2,168
Washington 1 614 875 427 206 87 45 29 30 2,313
West Virginia 1 237 575 240 143 71 38 21 18 1,343
Wisconsin 15 1,557 910 510 314 170 89 48 56 3,653
Wyoming 55 1,269 986 281 116 42 14 8 5 2,720
U.S. Total 1,170 49,301 45,747 15,403 7,693 3,969 1,851 1,077 1,246 126,288
Puerto Rico 4 3 19 21 16 15 9 9 25 117
Grand Total 1,175 49,303 45,767 15,424 7,709 3,984 1,861 1,086 1,271 126,405

NATIONAL HIGHWAY SYSTEM LENGTH - 2020
  MILES BY MEASURED PAVEMENT ROUGHNESS - URBAN

November 19, 2024

INTERNATIONAL ROUGHNESS INDEX (IRI) (1)

Table HM-47 (Sheet 3 of 4)
STATE 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 1 309 58 23 17 9 5 4 7 432 9 466 485 149 78 44 23 14 21 1,281
Alaska - 30 32 10 4 2 1 - - 79 1 28 49 28 19 11 7 6 12 160
Arizona 6 139 63 18 10 7 3 2 2 243 10 157 192 133 118 83 59 37 52 831
Arkansas - 145 91 36 21 13 7 4 6 323 1 113 241 102 67 46 29 20 66 685
California - 235 395 216 167 107 58 34 35 1,247 48 382 971 867 973 1,007 823 752 2,144 7,920
Colorado - 53 108 56 40 24 10 7 6 304 - 110 364 252 210 145 88 67 147 1,381
Connecticut - 149 116 28 13 5 3 1 1 317 1 107 304 186 134 83 50 34 60 958
Delaware - 13 13 6 3 2 1 1 1 40 4 43 112 39 23 13 7 5 11 253
District of Columbia 8 - 1 1 - 1 - - - 4 3 1 1 2 6 8 10 12 79 119
Florida 6 496 185 42 24 16 6 2 1 772 10 1,246 1,780 677 360 202 109 70 117 4,560
Georgia - 421 173 59 28 16 6 3 2 709 - 767 1,105 398 213 116 63 33 61 2,756
Hawaii - 5 14 11 8 8 5 3 1 55 4 30 73 47 38 38 27 18 46 317
Idaho - 46 35 6 2 2 1 1 - 92 9 54 90 34 21 17 8 7 12 244
Illinois - 417 327 84 48 37 19 10 15 958 1 338 696 526 437 328 220 168 403 3,116
Indiana 2 257 128 45 29 18 8 4 3 492 30 238 226 80 45 32 16 9 10 656
Iowa 2 46 68 30 15 8 4 2 2 175 9 97 209 191 144 93 60 46 88 929
Kansas 3 133 52 23 13 7 3 2 1 234 32 135 147 57 43 31 20 13 22 468
Kentucky - 117 59 24 13 9 6 2 3 232 49 174 232 117 62 33 20 13 22 673
Louisiana 3 128 84 52 48 46 28 13 16 414 85 110 220 145 124 113 87 71 174 1,044
Maine - 59 21 5 1 1 1 - - 87 1 37 41 18 16 14 10 6 16 159
Maryland - 125 131 31 15 10 7 5 12 336 11 238 381 151 110 87 67 61 198 1,293
Massachusetts 1 366 75 23 15 12 5 3 5 504 52 291 390 308 291 263 191 160 400 2,294
Michigan 31 237 237 65 40 28 15 9 15 645 516 282 550 389 296 213 141 115 230 2,217
Minnesota 2 125 138 40 18 11 3 1 2 338 1 253 336 154 83 44 22 13 15 919
Mississippi - 142 56 20 12 12 5 4 3 254 5 149 280 167 119 86 51 40 100 992
Missouri - 302 140 41 26 18 8 5 4 544 3 323 438 205 132 96 62 46 80 1,383
Montana - 54 23 4 3 1 - - 1 87 - 36 63 31 22 17 11 10 17 206
Nebraska - 18 33 12 4 2 1 - - 69 5 23 94 63 55 46 37 35 105 457
Nevada - 90 32 15 13 7 2 2 1 162 - 123 110 63 42 32 15 13 20 418
New Hampshire - 83 11 1 - - - - - 96 - 124 103 34 23 14 8 6 12 324
New Jersey - 177 127 31 16 12 9 6 9 387 - 430 578 277 240 211 155 126 320 2,337
New Mexico - 83 41 11 8 5 2 3 2 155 4 66 109 60 47 35 20 12 27 376
New York 15 218 362 121 80 51 28 20 33 912 128 156 907 610 472 374 266 254 855 3,894
North Carolina 13 326 186 49 22 12 7 5 4 611 35 187 498 360 247 159 80 56 73 1,659
North Dakota - 23 29 6 3 1 - - - 61 1 31 56 33 26 18 11 9 18 204
Ohio 1 483 272 82 46 25 14 8 6 937 15 333 664 340 260 190 119 94 203 2,202
Oklahoma 1 77 113 43 20 13 7 4 5 282 9 85 234 119 78 54 30 25 42 667
Oregon - 107 87 18 10 6 4 1 1 234 15 134 260 155 117 80 53 39 81 919
Pennsylvania - 345 254 81 44 29 17 11 17 797 3 313 826 577 490 377 247 179 411 3,420
Rhode Island - 42 5 2 1 1 - - - 52 7 44 58 42 53 49 40 34 93 415
South Carolina 388 - - - - - - - - - 7 192 466 247 170 108 55 33 36 1,306
South Dakota - 21 46 12 5 2 1 - - 88 3 14 40 29 21 18 12 9 10 154
Tennessee - 398 96 31 14 8 4 2 3 557 3 567 670 273 184 118 72 51 107 2,042
Texas 6 369 587 240 156 86 40 17 11 1,505 80 757 1,882 1,147 809 569 382 293 704 6,542
Utah - 77 102 40 17 11 4 2 1 253 2 146 258 123 74 43 22 14 23 702
Vermont - 38 18 5 3 1 - - - 64 3 20 27 12 7 6 4 3 8 86
Virginia - 214 253 75 33 18 8 5 3 610 1 129 600 352 278 203 125 86 91 1,864
Washington - 138 125 47 22 12 5 4 4 356 12 183 430 278 246 195 141 116 283 1,872
West Virginia - 91 90 23 15 9 4 3 2 236 3 41 154 83 50 33 19 12 14 406
Wisconsin 4 97 122 59 44 23 10 5 3 362 46 145 301 278 280 257 172 136 328 1,896
Wyoming - 46 30 10 7 5 4 2 2 106 6 42 53 25 16 12 8 5 12 174
U.S. Total 495 8,108 5,844 2,015 1,216 767 387 221 253 18,811 1,283 10,491 19,352 11,032 8,471 6,465 4,372 3,489 8,477 72,150
Puerto Rico 6 5 48 46 35 28 18 15 30 225 8 2 19 30 45 55 50 50 146 396
Grand Total 501 8,113 5,891 2,061 1,251 795 405 237 283 19,035 1,291 10,493 19,372 11,063 8,516 6,520 4,422 3,539 8,623 72,546

NATIONAL HIGHWAY SYSTEM LENGTH - 2020
  MILES BY MEASURED PAVEMENT ROUGHNESS - URBAN

November 19, 2024

INTERNATIONAL ROUGHNESS INDEX (IRI) (1)

Table HM-47 (Sheet 4 of 4)
STATE TOTAL URBAN NHS
NOT REPORTED (2) < 60 60-94 95-119 120-144 145-170 171-194 195-220 > 220 TOTAL REPORTED
Alabama 9 775 543 172 95 53 28 18 28 1,713
Alaska 1 58 81 38 23 13 8 6 12 238
Arizona 16 296 255 151 128 89 61 39 55 1,075
Arkansas 1 258 332 138 87 60 36 24 71 1,008
California 48 618 1,366 1,083 1,140 1,114 881 786 2,180 9,167
Colorado - 163 472 308 249 169 98 74 153 1,685
Connecticut 1 255 420 215 147 89 53 35 61 1,275
Delaware 4 56 125 45 26 15 9 6 12 294
District of Columbia 12 1 3 3 6 9 11 12 80 122
Florida 16 1,742 1,964 719 384 218 115 72 118 5,332
Georgia - 1,188 1,278 457 242 132 69 37 63 3,465
Hawaii 4 35 87 58 46 47 32 20 47 371
Idaho 9 100 125 40 23 19 9 8 12 336
Illinois 1 755 1,023 610 485 366 239 178 418 4,074
Indiana 33 495 354 125 75 50 24 13 13 1,148
Iowa 10 143 277 221 160 101 64 48 90 1,103
Kansas 35 268 199 80 56 39 23 15 23 702
Kentucky 49 291 291 141 75 42 26 16 25 905
Louisiana 88 238 305 197 172 159 115 83 189 1,458
Maine 1 96 62 23 18 15 10 6 16 246
Maryland 11 363 512 182 125 97 74 66 210 1,629
Massachusetts 53 657 465 331 306 275 196 164 404 2,799
Michigan 547 519 787 454 335 241 157 124 245 2,862
Minnesota 3 378 474 194 101 54 25 14 17 1,257
Mississippi 5 291 336 188 131 98 56 44 103 1,245
Missouri 3 625 578 245 158 115 70 51 84 1,926
Montana - 90 86 35 25 19 11 11 18 293
Nebraska 5 41 127 74 59 47 37 35 105 526
Nevada - 213 143 77 55 39 17 15 21 580
New Hampshire - 207 114 36 24 14 8 6 12 420
New Jersey - 607 705 307 256 223 164 132 329 2,724
New Mexico 4 149 150 71 55 40 22 15 29 532
New York 143 374 1,270 731 551 424 294 274 888 4,807
North Carolina 49 513 684 410 268 170 87 60 78 2,271
North Dakota 1 54 85 39 29 19 12 10 18 265
Ohio 16 816 936 422 306 215 133 102 209 3,140
Oklahoma 11 163 347 161 98 68 37 29 46 949
Oregon 15 241 347 173 127 86 56 40 82 1,153
Pennsylvania 3 657 1,080 658 534 405 264 190 428 4,217
Rhode Island 7 86 63 44 54 50 41 35 93 467
South Carolina 394 192 466 247 170 108 55 33 36 1,306
South Dakota 3 35 86 41 27 20 13 10 10 241
Tennessee 4 965 766 304 198 126 76 53 110 2,598
Texas 86 1,126 2,468 1,387 965 655 421 310 715 8,047
Utah 2 223 360 163 91 54 25 16 24 956
Vermont 3 58 44 17 10 6 4 3 8 150
Virginia 1 343 853 428 311 221 133 91 94 2,474
Washington 12 321 554 325 267 207 146 120 288 2,228
West Virginia 3 132 244 106 65 42 23 15 16 642
Wisconsin 50 241 423 338 324 280 182 140 331 2,258
Wyoming 6 88 83 35 24 17 11 7 14 280
U.S. Total 1,778 18,599 25,196 13,047 9,687 7,232 4,759 3,711 8,730 90,960
Puerto Rico 14 7 67 76 80 83 68 65 176 621
Grand Total 1,792 18,605 25,263 13,123 9,767 7,315 4,827 3,776 8,906 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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