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FHWA Home / Policy & Governmental Affairs / Highway Policy Information / Highway Statistics Series / 2022 / Table HM-47 - Highway Statistics 2022

Highway Statistics Series

Highway Statistics 2022


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NATIONAL HIGHWAY SYSTEM LENGTH -2022
  MILES BY MEASURED PAVEMENT ROUGHNESS - RURAL

January 29, 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 - 461 52 23 16 8 5 2 3 570 4 1,101 663 137 56 28 10 7 5 2,008
Alaska 1 211 363 159 103 71 36 23 34 1,001 278 126 214 79 75 59 43 35 78 710
Arizona 9 556 190 64 42 25 11 9 10 907 8 340 405 195 117 67 34 17 18 1,195
Arkansas - 255 116 32 19 11 6 3 5 445 - 479 808 306 163 87 42 23 28 1,937
California 1 449 395 151 99 56 27 16 17 1,209 53 889 1,659 679 369 215 102 59 84 4,056
Colorado - 85 311 123 52 31 17 12 16 648 - 576 1,091 428 224 122 59 38 39 2,576
Connecticut - 19 8 1 1 - - - - 29 - 23 63 35 19 8 5 2 2 158
Delaware - - - - - - - - - - - 33 73 20 6 3 2 1 1 138
District of Columbia - - - - - - - - - - - - - - - - - - - -
Florida 3 599 93 13 6 2 1 - - 715 - 1,296 1,046 258 95 42 15 6 7 2,765
Georgia - 341 153 23 12 6 2 1 1 538 - 1,302 1,311 394 153 54 18 8 7 3,247
Hawaii - - - - - - - - - - 1 5 30 18 10 7 4 2 3 79
Idaho 9 327 138 28 13 5 3 1 2 516 65 593 699 198 81 37 16 9 7 1,639
Illinois - 805 301 75 30 18 9 4 6 1,247 - 604 847 403 243 144 73 46 50 2,411
Indiana - 482 205 64 32 14 6 4 5 812 4 882 543 173 86 34 11 5 3 1,737
Iowa - 264 231 68 28 12 4 2 3 611 14 892 1,189 581 350 188 96 57 58 3,411
Kansas 1 412 154 42 22 6 2 1 1 639 2 1,638 1,042 189 77 40 18 12 13 3,029
Kentucky 1 505 136 34 18 8 5 2 1 710 6 884 546 127 53 21 7 6 4 1,648
Louisiana - 186 125 91 60 41 15 6 3 527 3 114 392 227 149 94 55 33 31 1,095
Maine - 228 42 6 1 1 - - - 279 1 364 247 76 41 28 16 11 18 800
Maryland - 67 57 11 4 2 1 - 1 142 1 186 153 27 10 6 4 2 4 391
Massachusetts - 36 16 4 2 2 1 1 1 63 - 93 179 61 32 19 10 8 9 410
Michigan 4 304 170 31 24 14 7 5 4 558 10 1,426 716 171 78 40 21 12 13 2,476
Minnesota - 297 236 37 12 3 2 - - 588 - 1,452 1,266 405 193 95 42 21 18 3,492
Mississippi - 361 147 32 16 11 6 2 2 578 - 504 695 255 150 100 50 28 31 1,813
Missouri - 634 146 36 15 9 4 2 1 847 - 1,280 1,149 322 138 62 27 12 11 2,999
Montana - 552 425 72 30 11 3 2 - 1,095 - 755 1,226 434 195 83 38 19 21 2,772
Nebraska 1 208 147 36 15 5 2 1 - 414 4 930 1,007 333 189 104 48 30 36 2,678
Nevada - 411 30 8 4 2 1 - - 457 - 897 482 109 49 18 7 3 1 1,567
New Hampshire - 117 17 6 1 1 - - - 142 - 191 129 33 14 9 6 3 3 387
New Jersey - 20 19 4 1 1 - - - 45 - 85 73 17 8 5 3 2 2 195
New Mexico - 502 195 61 35 23 11 9 8 844 - 569 652 240 129 75 39 20 24 1,750
New York 8 352 275 76 42 25 10 6 11 797 35 339 1,140 388 187 103 48 28 24 2,257
North Carolina - 447 114 16 9 4 2 1 2 595 27 603 974 354 131 51 19 10 9 2,152
North Dakota - 332 142 25 7 2 1 - 1 510 - 1,351 1,050 301 132 56 23 13 19 2,946
Ohio - 410 158 39 18 11 4 2 2 643 1 727 763 231 100 45 17 10 7 1,901
Oklahoma 10 314 235 43 22 12 7 4 2 639 31 498 926 399 216 114 56 36 48 2,292
Oregon - 302 144 33 8 5 2 1 1 495 1 723 1,291 363 143 64 28 19 24 2,656
Pennsylvania - 580 321 74 41 22 12 7 10 1,066 - 462 868 301 136 63 34 18 26 1,907
Rhode Island - 13 3 1 - - - - - 18 1 16 19 13 17 17 11 7 6 106
South Carolina 18 349 110 32 19 11 5 2 1 529 5 378 736 237 123 59 25 12 11 1,580
South Dakota - 335 227 17 6 3 1 1 - 591 - 961 1,142 416 201 86 41 22 19 2,889
Tennessee - 520 78 22 12 7 3 1 2 645 - 737 653 169 88 50 21 15 10 1,742
Texas 5 878 807 200 69 32 13 6 3 2,008 46 2,933 3,250 1,230 553 248 96 41 31 8,382
Utah - 380 226 53 17 5 2 1 - 685 - 276 507 216 112 49 16 6 4 1,186
Vermont - 169 64 10 5 3 2 2 1 255 - 91 130 36 18 11 5 3 12 307
Virginia - 300 235 38 11 4 1 1 - 591 - 287 891 336 155 61 21 11 5 1,768
Washington - 215 127 37 22 11 6 5 6 429 - 341 866 389 167 78 34 24 24 1,924
West Virginia 1 186 91 19 10 7 3 2 1 319 15 145 380 207 122 65 34 25 26 1,004
Wisconsin - 291 126 54 23 10 5 2 1 512 13 1,133 872 478 309 173 83 48 47 3,143
Wyoming - 518 187 55 26 12 5 2 1 807 55 642 873 244 97 36 11 6 5 1,914
U.S. Total 71 16,585 8,286 2,182 1,082 581 272 154 168 29,311 688 33,152 37,929 13,241 6,560 3,322 1,546 889 987 97,627
Puerto Rico - 3 14 9 5 4 3 4 13 54 - - 5 11 12 12 7 6 13 67
Grand Total 71 16,588 8,300 2,190 1,087 585 275 158 181 29,365 688 33,152 37,934 13,253 6,572 3,334 1,553 896 1,000 97,694

NATIONAL HIGHWAY SYSTEM LENGTH -2022
  MILES BY MEASURED PAVEMENT ROUGHNESS - RURAL

January 29, 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 4 1,562 715 161 72 36 15 9 8 2,578
Alaska 279 338 577 239 179 130 80 58 112 1,710
Arizona 17 896 595 259 159 92 46 27 29 2,102
Arkansas - 734 924 338 182 98 48 26 34 2,383
California 54 1,339 2,053 830 468 270 129 75 101 5,265
Colorado - 661 1,402 551 276 153 76 51 55 3,224
Connecticut - 41 71 36 20 8 5 2 2 186
Delaware - 33 73 20 6 3 2 1 1 138
District of Columbia - - - - - - - - - -
Florida 3 1,894 1,140 271 102 44 16 6 7 3,480
Georgia - 1,643 1,463 417 165 60 20 9 8 3,786
Hawaii 1 5 30 18 10 7 4 2 3 79
Idaho 74 920 837 226 94 42 18 10 9 2,155
Illinois - 1,409 1,148 478 273 162 82 50 56 3,658
Indiana 4 1,364 749 236 118 48 17 9 8 2,549
Iowa 14 1,156 1,420 649 378 200 100 60 60 4,023
Kansas 2 2,050 1,196 231 99 46 20 13 14 3,668
Kentucky 7 1,390 682 161 71 29 12 8 5 2,358
Louisiana 4 300 518 318 208 136 70 39 34 1,622
Maine 1 592 290 82 42 29 16 11 18 1,079
Maryland 1 253 209 38 14 8 4 2 5 533
Massachusetts - 129 195 65 34 20 11 8 9 473
Michigan 15 1,730 886 202 102 53 28 17 16 3,034
Minnesota - 1,748 1,502 443 205 98 44 21 18 4,080
Mississippi - 866 843 288 166 111 55 30 33 2,391
Missouri - 1,914 1,295 358 153 71 31 14 11 3,846
Montana - 1,307 1,651 506 226 93 42 21 21 3,867
Nebraska 5 1,139 1,154 370 204 109 50 31 36 3,092
Nevada - 1,308 512 117 53 20 8 4 2 2,024
New Hampshire - 308 146 39 15 9 6 3 3 529
New Jersey - 105 92 21 9 6 3 2 2 240
New Mexico - 1,071 848 301 165 98 51 29 32 2,594
New York 43 691 1,415 464 229 128 58 34 35 3,055
North Carolina 27 1,050 1,088 370 140 54 22 11 11 2,747
North Dakota - 1,683 1,193 327 139 58 24 14 20 3,456
Ohio 1 1,137 921 270 118 56 21 11 10 2,544
Oklahoma 41 812 1,161 442 238 126 63 39 50 2,931
Oregon 1 1,025 1,434 396 151 69 30 20 25 3,151
Pennsylvania - 1,042 1,189 376 177 85 46 25 35 2,974
Rhode Island 1 29 22 15 18 17 11 7 6 124
South Carolina 22 727 846 270 141 70 30 13 11 2,109
South Dakota - 1,297 1,369 434 207 89 42 23 20 3,480
Tennessee - 1,257 730 191 100 57 23 16 12 2,387
Texas 51 3,811 4,057 1,430 622 280 109 47 34 10,390
Utah - 656 733 270 129 55 17 6 5 1,871
Vermont 1 260 194 46 23 14 7 5 13 563
Virginia - 586 1,126 375 167 66 23 12 6 2,359
Washington - 557 993 427 189 88 40 30 30 2,353
West Virginia 16 331 471 225 132 72 37 26 27 1,323
Wisconsin 13 1,423 998 532 331 184 89 49 48 3,654
Wyoming 55 1,161 1,060 299 122 48 16 8 6 2,721
U.S. Total 759 49,737 46,215 15,423 7,642 3,904 1,817 1,044 1,155 126,937
Puerto Rico - 3 18 20 17 16 10 10 26 121
Grand Total 760 49,740 46,233 15,443 7,660 3,920 1,828 1,054 1,181 127,059

NATIONAL HIGHWAY SYSTEM LENGTH -2022
  MILES BY MEASURED PAVEMENT ROUGHNESS - URBAN

January 29, 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 1 312 56 23 15 9 6 5 6 432 129 461 447 118 61 35 19 10 12 1,164
Alaska - 30 31 11 4 2 1 - - 79 11 22 46 26 18 12 8 7 12 150
Arizona 11 119 71 24 17 7 2 1 1 241 11 168 193 129 119 87 53 35 46 830
Arkansas - 130 96 39 23 16 8 6 6 323 - 105 234 103 67 49 31 23 68 679
California 8 244 401 219 156 101 57 30 30 1,237 425 392 976 872 957 961 774 688 1,964 7,582
Colorado - 57 103 50 42 27 12 6 7 304 1 113 374 258 204 136 95 63 138 1,381
Connecticut - 144 116 31 13 8 2 2 2 318 2 91 302 184 131 88 55 35 70 956
Delaware 1 12 12 6 3 2 2 1 1 40 - 39 103 44 26 15 9 6 14 256
District of Columbia 1 - 2 2 2 1 1 1 1 11 4 - 1 2 5 10 11 13 76 119
Florida 28 488 185 40 19 10 5 1 1 750 8 1,218 1,764 676 357 218 118 73 124 4,548
Georgia 7 427 169 58 28 15 7 2 2 709 - 780 1,093 389 204 117 59 39 69 2,749
Hawaii - 1 11 12 10 9 6 3 2 55 3 30 66 49 40 40 26 20 46 317
Idaho 3 49 35 5 3 2 - - - 93 28 50 87 33 21 15 8 7 10 231
Illinois - 378 332 89 57 37 19 13 13 938 2 301 742 545 441 327 223 170 406 3,156
Indiana - 235 126 64 34 19 7 3 4 492 8 243 225 91 56 32 16 11 12 686
Iowa 1 46 74 29 13 7 3 2 1 175 9 110 219 182 140 92 59 43 87 931
Kansas 3 127 57 24 13 7 4 1 1 234 36 135 143 62 42 34 22 13 23 473
Kentucky - 114 65 22 13 9 4 2 2 233 41 164 235 90 59 41 28 21 36 673
Louisiana 3 126 83 48 50 50 28 14 15 414 52 100 224 150 138 119 93 78 181 1,081
Maine - 62 17 5 2 1 - - - 87 1 34 44 22 18 14 7 6 14 159
Maryland - 134 125 29 16 8 6 6 12 336 9 242 365 155 109 85 67 57 216 1,296
Massachusetts 2 350 80 24 18 12 7 4 7 504 49 258 383 290 281 264 192 162 467 2,296
Michigan 2 248 247 65 43 30 17 10 14 675 436 324 588 386 289 217 154 121 218 2,297
Minnesota 1 119 139 33 18 10 3 2 1 324 - 254 324 139 65 34 17 9 12 855
Mississippi - 144 58 18 12 10 5 3 3 253 2 149 280 168 117 86 51 40 100 991
Missouri - 295 141 40 27 18 8 6 3 538 - 305 430 196 129 98 65 45 77 1,344
Montana - 55 31 6 4 2 - - - 98 - 35 69 34 23 20 12 10 17 221
Nebraska - 17 30 13 4 3 1 1 - 69 34 25 83 51 47 48 37 33 106 430
Nevada - 90 31 17 14 6 3 1 - 162 - 120 119 60 43 30 20 12 19 424
New Hampshire - 73 8 1 - - - - - 83 - 137 85 35 22 13 8 6 13 320
New Jersey - 184 116 28 21 13 9 7 9 387 - 405 593 294 237 207 156 131 319 2,341
New Mexico - 83 40 13 7 5 3 2 2 155 - 69 110 56 45 33 19 13 34 380
New York 20 207 351 137 81 51 33 20 35 916 145 134 911 622 489 385 285 253 831 3,910
North Carolina - 448 242 59 22 11 8 4 5 799 13 318 684 428 276 169 89 56 81 2,101
North Dakota - 23 27 7 2 1 - - - 61 1 31 55 34 28 18 12 9 18 204
Ohio 2 454 275 88 50 30 15 12 11 936 16 357 629 335 250 195 126 99 207 2,197
Oklahoma 6 82 110 39 20 13 6 4 4 277 15 87 234 118 83 52 31 25 43 674
Oregon - 124 74 16 10 5 4 1 2 234 43 134 255 151 113 77 50 36 75 891
Pennsylvania - 342 266 76 46 25 14 10 19 797 - 311 831 579 484 363 247 176 417 3,408
Rhode Island - 34 12 3 2 1 - - - 52 14 31 53 42 55 57 46 37 87 409
South Carolina 17 173 74 19 11 7 2 1 1 287 6 132 416 237 160 100 48 32 36 1,161
South Dakota - 22 48 11 4 2 1 - - 88 1 15 39 26 25 19 13 9 8 155
Tennessee 1 379 103 36 17 11 5 3 4 556 5 607 676 276 171 118 66 51 102 2,067
Texas 4 379 552 234 149 84 37 17 7 1,460 103 800 1,848 1,112 793 581 373 288 694 6,488
Utah - 76 106 38 17 9 4 1 1 253 - 135 275 126 73 40 24 12 20 705
Vermont - 40 19 2 2 - - - - 64 2 16 26 13 9 7 5 3 7 87
Virginia - 158 228 71 34 19 10 6 3 528 - 121 547 339 261 200 119 78 92 1,756
Washington - 135 114 41 22 11 5 4 3 334 11 181 445 290 240 187 132 108 272 1,855
West Virginia 1 117 63 22 16 8 5 3 2 235 2 56 145 81 47 34 16 11 22 412
Wisconsin - 102 124 60 44 21 9 3 3 367 34 142 312 287 279 255 174 134 321 1,905
Wyoming - 46 30 12 7 4 3 2 2 106 5 40 50 28 18 13 8 8 12 175
U.S. Total 123 8,232 5,905 2,056 1,260 774 400 226 245 19,099 1,722 10,525 19,376 11,011 8,366 6,445 4,375 3,429 8,352 71,878
Puerto Rico - 6 44 42 36 30 19 17 36 231 9 1 19 30 47 54 51 48 152 401
Grand Total 124 8,238 5,950 2,098 1,296 804 419 244 281 19,330 1,731 10,526 19,394 11,041 8,412 6,499 4,426 3,477 8,504 72,279

NATIONAL HIGHWAY SYSTEM LENGTH -2022
  MILES BY MEASURED PAVEMENT ROUGHNESS - URBAN

January 29, 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 130 773 504 142 76 44 25 15 18 1,596
Alaska 11 52 77 37 22 13 9 7 12 229
Arizona 23 287 264 153 136 94 56 36 46 1,071
Arkansas - 235 329 141 90 65 39 29 74 1,001
California 434 635 1,377 1,090 1,113 1,062 830 718 1,994 8,820
Colorado 1 170 477 308 246 163 107 69 144 1,684
Connecticut 2 235 418 215 145 95 58 37 71 1,273
Delaware 1 51 115 50 29 17 10 7 15 296
District of Columbia 5 - 3 4 7 11 13 14 77 130
Florida 36 1,707 1,948 716 376 228 124 75 125 5,298
Georgia 7 1,207 1,263 447 232 132 66 41 70 3,458
Hawaii 3 31 77 62 50 50 31 23 49 372
Idaho 31 99 121 38 24 17 8 7 11 325
Illinois 2 678 1,075 634 499 364 242 183 419 4,094
Indiana 8 479 350 155 91 51 24 14 16 1,179
Iowa 10 156 293 211 153 99 62 45 88 1,106
Kansas 39 263 200 85 55 40 26 14 24 707
Kentucky 42 278 300 112 73 50 32 23 38 906
Louisiana 55 226 306 198 188 169 121 92 196 1,495
Maine 1 96 61 27 20 15 8 7 14 246
Maryland 9 377 489 184 125 94 73 63 228 1,632
Massachusetts 51 608 463 314 300 277 199 166 473 2,800
Michigan 438 572 834 451 332 247 171 132 232 2,972
Minnesota 2 373 463 172 83 44 19 11 13 1,179
Mississippi 2 293 338 185 129 96 56 44 102 1,244
Missouri - 600 571 236 156 116 74 51 80 1,882
Montana - 91 100 40 27 21 12 10 17 319
Nebraska 34 42 113 64 51 50 39 34 106 499
Nevada - 210 150 77 57 36 23 14 20 586
New Hampshire - 209 94 36 23 14 8 6 13 403
New Jersey - 588 709 322 258 220 165 138 328 2,727
New Mexico - 152 151 69 52 38 22 16 36 536
New York 165 341 1,262 759 571 436 318 274 866 4,827
North Carolina 13 766 926 486 298 180 98 60 86 2,901
North Dakota 1 54 82 41 30 19 12 9 18 265
Ohio 18 811 904 422 300 225 142 111 219 3,133
Oklahoma 20 169 344 156 103 66 38 29 47 951
Oregon 43 258 329 166 122 82 53 37 77 1,125
Pennsylvania - 653 1,097 655 530 389 261 185 436 4,205
Rhode Island 14 65 65 45 57 58 46 38 88 462
South Carolina 23 305 490 256 171 106 50 33 36 1,448
South Dakota 1 37 87 37 29 21 14 9 8 243
Tennessee 6 986 778 312 188 129 70 54 106 2,623
Texas 106 1,179 2,400 1,346 942 665 410 305 702 7,948
Utah - 211 381 165 90 49 27 14 21 958
Vermont 2 56 45 15 11 7 5 4 7 151
Virginia - 279 775 410 295 218 129 83 95 2,284
Washington 11 315 559 331 261 199 137 112 275 2,189
West Virginia 3 173 208 103 63 42 21 14 24 647
Wisconsin 34 244 436 348 323 276 184 138 324 2,272
Wyoming 5 85 80 40 25 17 10 10 14 280
U.S. Total 1,845 18,757 25,281 13,067 9,625 7,219 4,775 3,655 8,597 90,977
Puerto Rico 9 7 63 71 82 85 70 66 187 632
Grand Total 1,855 18,764 25,344 13,139 9,708 7,304 4,845 3,721 8,785 91,609

(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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