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FHWA Home / Policy & Governmental Affairs / Highway Policy Information / Highway Statistics Series / 2024 / Table HM-64

Highway Statistics Series

Highway Statistics 2024


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Functional System Length - 2024

October 17, 2025

MILES BY MEASURED PAVEMENT ROUGHNESS - RURAL

INTERNATIONAL ROUGHNESS INDEX (IRI) (1)

Table HM-64
(Sheet 1 of 4)
STATE INTERSTATE
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
Alaska 0 204 332 168 109 78 46 29 34 998
Arizona 1 541 223 75 38 23 12 7 13 933
Arkansas - 252 111 32 16 9 6 1 1 430
California - 410 427 143 94 53 29 18 26 1,200
Colorado - 60 302 124 54 30 15 13 20 619
Connecticut - 21 7 1 0 0 - - 0 30
Delaware - - - - - - - - - -
District of Columbia - - - - - - - - - -
Florida - 539 92 17 9 3 1 1 0 661
Georgia - 427 156 40 12 8 3 1 2 649
Hawaii - 0 1 1 2 1 0 0 0 6
Idaho 0 303 151 32 17 8 3 1 1 517
Illinois - 829 266 71 30 14 7 6 4 1,228
Indiana 4 407 240 82 43 25 11 7 7 823
Iowa - 227 257 64 24 14 5 3 3 597
Kansas 0 409 143 38 24 7 2 1 0 624
Kentucky 2 523 147 34 19 11 4 1 1 741
Louisiana 5 172 136 92 68 33 13 5 2 523
Maine 0 210 33 9 3 1 0 0 0 256
Maryland 0 64 52 12 4 2 1 1 1 136
Massachusetts - 37 12 2 1 1 0 0 0 53
Michigan 4 281 184 29 20 14 7 3 3 540
Minnesota - 259 244 47 13 4 1 0 1 569
Mississippi - 358 134 32 19 12 7 3 2 567
Missouri - 617 146 37 17 11 8 3 2 841
Montana - 521 450 78 32 13 6 2 4 1,105
Nebraska - 220 149 22 9 6 4 1 0 410
Nevada - 416 26 6 3 2 1 - 0 456
New Hampshire - 105 16 4 3 1 0 0 - 129
New Jersey - 16 21 5 2 1 0 0 - 45
New Mexico 0 480 171 67 41 28 18 11 11 825
New York 14 374 306 63 33 20 8 3 3 809
North Carolina 0 568 180 31 13 7 4 2 3 808
North Dakota - 275 181 32 12 3 1 1 1 505
Ohio - 394 156 38 18 10 3 2 2 624
Oklahoma 12 303 251 52 22 11 6 4 2 652
Oregon - 313 145 31 11 6 2 1 1 509
Pennsylvania - 656 341 81 36 18 9 6 9 1,156
Rhode Island - 12 3 1 0 - - - - 15
South Carolina 1 291 116 25 17 7 3 2 1 462
South Dakota - 297 260 22 8 3 1 1 0 591
Tennessee 2 586 56 15 10 5 3 1 1 678
Texas 14 819 821 194 68 29 12 5 4 1,953
Utah - 387 214 48 22 6 2 1 1 680
Vermont 1 189 58 10 6 2 1 1 1 268
Virginia - 263 187 30 11 5 3 1 2 502
Washington - 200 103 40 23 15 8 9 9 407
West Virginia 0 150 162 27 15 10 4 2 2 371
Wisconsin 0 287 134 58 24 13 5 2 1 525
Wyoming - 528 177 51 27 13 6 3 2 807
U.S. Total 64 16,267 8,536 2,233 1,113 603 296 166 185 29,398
Puerto Rico 0 3 18 10 7 6 6 4 6 61
Grand Total 65 16,270 8,554 2,243 1,120 608 302 170 192 29,459

October 17, 2025

MILES BY MEASURED PAVEMENT ROUGHNESS - RURAL

INTERNATIONAL ROUGHNESS INDEX (IRI) (1)

Table HM-64
(Sheet 2 of 4)
STATE OTHER FREEWAYS & EXPRESSWAYS OTHER PRINCIPAL ARTERIAL MINOR ARTERIAL (3)
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 NOT REPORTED (2) < 60 60-94 95-119 120-144 145-170 171-194 195-220 > 220 TOTAL REPORTED
Alabama - - - - - - - - - - 18 1,084 663 150 71 34 14 7 8 2,031 123 877 2,122 563 174 63 17 11 7 3,835
Alaska - - - - - - - - - - 279 103 176 48 36 32 22 22 77 517 2 30 79 55 57 45 25 13 13 317
Arizona 0 8 7 2 1 1 0 0 0 19 10 324 432 196 126 80 42 28 32 1,260 15 250 688 504 326 207 114 67 55 2,210
Arkansas - 8 41 18 4 1 0 - 0 73 49 597 716 228 124 69 30 16 15 1,794 1,097 148 948 343 331 44 92 9 6 1,920
California 0 121 173 59 30 11 6 3 5 409 104 728 1,375 547 292 170 77 45 68 3,302 - 425 998 803 709 540 330 248 385 4,438
Colorado - 9 13 5 3 1 1 0 0 31 - 502 1,099 434 231 112 55 34 49 2,515 1 234 949 592 481 299 196 126 211 3,089
Connecticut - 19 12 1 0 0 - - - 34 - 8 48 32 17 9 4 3 2 122 - 8 91 42 33 19 11 5 4 214
Delaware 0 11 14 2 1 0 0 0 0 29 13 35 53 13 3 1 0 0 0 105 1 26 45 13 6 1 0 - 0 92
District of Columbia - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Florida - 112 17 2 0 0 - 0 - 131 90 1,250 910 229 86 35 15 6 6 2,538 622 479 578 226 86 33 13 6 6 1,427
Georgia - - - - - - - - - - - 1,223 1,083 306 123 39 14 6 5 2,798 - 883 2,500 1,105 457 162 55 22 30 5,214
Hawaii - - - - - - - - - - 1 5 23 16 8 6 3 2 3 67 0 43 72 34 26 24 17 11 20 248
Idaho - 32 50 11 5 2 1 0 0 101 16 454 632 267 138 60 29 16 15 1,611 142 234 452 257 153 82 41 20 31 1,271
Illinois - 21 10 9 6 3 1 0 1 52 1 699 774 365 237 140 76 46 60 2,397 - 2,003 1,262 645 414 252 104 76 49 4,806
Indiana - 63 38 14 13 12 4 1 1 146 36 849 677 219 104 55 23 10 7 1,943 605 459 711 272 107 45 23 8 6 1,630
Iowa - - - - - - - - - - 9 853 1,115 596 363 212 97 62 60 3,357 3,904 - - - - - - - - -
Kansas 0 191 153 25 10 3 2 0 0 384 2 1,497 826 158 64 32 16 8 10 2,611 3 1,937 1,666 282 152 91 49 26 42 4,244
Kentucky - 244 89 9 4 2 0 0 0 350 1 541 461 124 42 18 7 3 3 1,199 30 351 1,055 486 198 82 46 25 17 2,261
Louisiana - 3 8 7 5 2 2 1 6 34 17 100 344 207 137 100 52 33 33 1,007 5 152 577 407 308 199 123 65 64 1,896
Maine 0 1 1 0 - - - - 0 2 2 367 267 61 28 19 10 8 16 777 1 267 332 116 67 41 26 21 34 904
Maryland 0 38 35 5 1 1 0 0 1 81 2 177 149 31 10 6 3 2 4 381 1 214 329 100 45 19 13 6 10 736
Massachusetts - 3 0 - 0 - 0 - 0 3 - 35 45 10 4 2 1 0 0 97 0 55 121 41 34 27 9 6 4 297
Michigan 0 220 87 12 3 3 3 3 5 336 1 1,110 672 176 72 32 14 8 12 2,095 55 1,348 1,733 718 428 257 95 68 81 4,729
Minnesota - 15 17 6 2 0 0 0 - 40 - 1,217 1,173 487 242 116 47 29 28 3,339 - 2,911 2,028 751 447 154 94 87 86 6,557
Mississippi - - - - - - - - - - 1 564 674 247 133 92 44 22 23 1,798 - 581 1,392 633 420 289 189 130 163 3,797
Missouri - 631 353 70 28 10 4 2 1 1,100 0 727 718 242 100 44 18 9 8 1,867 3 270 1,264 1,054 737 348 182 69 71 3,996
Montana - - - - - - - - - - - 728 1,170 469 215 106 40 25 30 2,783 - 469 1,252 527 293 167 88 28 47 2,872
Nebraska - 68 152 63 29 11 5 1 1 331 1 789 969 284 120 62 29 15 19 2,288 27 1,920 1,270 391 241 141 85 41 33 4,122
Nevada - - - - - - - - - - - 951 392 105 43 17 7 2 3 1,519 - 114 346 176 55 17 6 4 2 721
New Hampshire - 17 2 0 - - - - - 20 - 178 100 19 7 2 1 1 1 309 - 201 203 73 36 32 27 22 21 615
New Jersey - 21 4 2 0 0 - - - 28 - 73 84 26 11 6 4 2 3 210 67 79 136 55 24 16 5 5 6 326
New Mexico - - - - - - - - - - 0 531 669 288 164 96 47 27 32 1,856 2 223 572 276 259 179 126 122 439 2,196
New York 0 23 77 31 20 14 7 3 2 178 177 319 1,097 344 164 88 38 26 22 2,099 2 389 1,440 550 235 130 65 31 59 2,900
North Carolina 6 259 187 34 17 8 5 2 3 515 9 426 907 362 145 51 20 11 11 1,933 78 137 1,341 904 534 281 129 92 128 3,545
North Dakota - - - - - - - - - - - 1,287 1,163 284 116 44 18 11 19 2,942 - 632 1,244 377 153 60 26 17 31 2,543
Ohio 0 138 101 39 27 10 4 3 2 324 1 606 613 171 73 35 15 7 7 1,527 1 662 1,252 424 177 63 21 18 8 2,624
Oklahoma - - - - - 0 - - - 0 66 551 840 367 184 103 53 35 50 2,183 86 351 1,040 476 282 172 116 69 56 2,562
Oregon - 10 5 0 0 - - - - 15 4 624 1,354 391 162 69 31 15 12 2,657 263 201 940 451 239 108 47 25 34 2,044
Pennsylvania - 131 170 46 20 12 6 4 6 394 - 379 920 340 161 74 38 23 28 1,963 1 516 1,648 1,162 699 387 166 86 95 4,760
Rhode Island - 6 3 0 - - - - - 9 1 15 22 8 11 10 9 5 5 85 1 8 12 7 6 8 7 5 5 57
South Carolina 1 12 10 2 1 1 1 - - 26 4 287 678 233 114 53 23 10 9 1,408 6 174 1,158 637 414 200 114 62 80 2,839
South Dakota - 140 108 27 11 3 1 0 0 291 3 904 1,078 343 142 61 23 16 22 2,588 103 950 980 439 282 119 55 20 11 2,857
Tennessee 3 16 14 4 2 1 0 0 0 37 264 780 633 185 93 50 28 16 24 1,810 - 322 526 169 72 46 15 15 13 1,178
Texas 36 25 55 21 6 4 1 1 0 113 32 3,003 3,401 1,343 641 275 110 55 45 8,873 17 1,863 3,690 2,016 1,301 603 205 70 102 9,849
Utah - 0 3 3 1 1 0 - - 8 10 302 517 201 94 41 14 5 3 1,177 - 164 527 256 147 73 35 14 10 1,226
Vermont - - 0 0 0 0 - 0 - 1 1 117 145 36 17 10 5 3 7 341 - - - - - - - - - -
Virginia - 23 31 5 2 0 0 0 0 62 - 250 777 307 133 56 21 12 9 1,565 31 117 1,491 1,053 506 206 71 26 16 3,487
Washington - 167 217 124 50 18 9 10 14 610 10 234 528 264 133 69 31 17 16 1,291 9 215 603 429 292 189 112 64 88 1,991
West Virginia 2 - 0 0 - 0 0 0 0 1 1 108 492 229 134 73 37 21 23 1,118 0 10 403 363 300 195 85 49 62 1,466
Wisconsin - 91 47 32 19 16 6 2 1 214 9 1,249 757 448 268 148 78 46 60 3,053 - 2,179 799 560 453 315 174 138 291 4,910
Wyoming - - - - - - - - - - 56 741 819 217 88 32 9 4 3 1,913 - 265 565 182 69 39 16 11 25 1,171
U.S. Total 48 2,897 2,306 694 321 151 72 39 51 6,532 1,298 30,481 35,235 12,652 6,227 3,145 1,438 835 1,008 91,020 7,304 26,350 45,431 21,996 13,264 7,068 3,661 2,161 3,059 122,989
Puerto Rico - - - 0 0 0 - - - 0 0 0 8 10 14 12 7 7 15 72 3 - - 4 8 17 25 26 195 275
Grand Total 48 2,897 2,306 694 321 151 72 39 51 6,532 1,298 30,481 35,243 12,662 6,241 3,156 1,445 842 1,023 91,093 7,307 26,350 45,431 21,999 13,272 7,085 3,686 2,187 3,253 123,264

October 17, 2025

MILES BY MEASURED PAVEMENT ROUGHNESS - URBAN

INTERNATIONAL ROUGHNESS INDEX (IRI) (1)

Table HM-64
(Sheet 3 of 4)
STATE INTERSTATE
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
Alaska - 30 35 10 4 2 1 1 0 82
Arizona 2 128 70 17 7 4 2 2 2 233
Arkansas - 167 91 33 21 11 7 4 5 338
California 0 260 415 211 162 102 52 27 26 1,255
Colorado - 62 131 55 38 23 11 5 7 333
Connecticut - 146 117 29 13 6 2 1 2 317
Delaware 0 13 13 7 4 2 1 0 1 41
District of Columbia 1 - 2 2 2 1 1 1 1 11
Florida - 530 206 49 26 13 6 2 1 834
Georgia - 370 130 51 24 14 6 2 1 598
Hawaii - 5 13 9 7 7 5 2 1 49
Idaho 0 51 31 6 2 2 1 0 0 95
Illinois - 400 337 91 52 31 19 12 16 958
Indiana 6 218 123 60 39 24 12 6 4 487
Iowa 1 47 83 30 17 8 4 2 1 191
Kansas 3 135 63 24 15 7 4 2 1 250
Kentucky 2 137 57 23 15 10 7 2 3 253
Louisiana 3 128 87 52 50 44 25 13 14 414
Maine 0 75 26 5 2 1 0 - 0 109
Maryland 0 132 136 34 18 12 7 6 12 358
Massachusetts - 367 74 25 18 13 6 4 6 513
Michigan 1 250 260 69 45 26 16 11 15 694
Minnesota - 124 144 40 19 11 3 2 1 344
Mississippi - 159 52 15 14 11 6 4 4 264
Missouri 0 293 142 42 27 21 9 6 5 544
Montana - 54 24 4 3 1 0 0 1 87
Nebraska - 17 36 14 5 2 1 0 0 73
Nevada - 109 35 15 12 5 2 0 0 179
New Hampshire - 80 14 2 0 0 - - - 96
New Jersey - 171 129 32 19 14 8 5 8 387
New Mexico - 85 48 13 9 9 5 3 3 174
New York 42 237 345 121 75 50 33 21 40 921
North Carolina 0 342 188 45 23 11 7 5 5 625
North Dakota - 22 32 8 3 1 0 - - 66
Ohio 1 471 291 81 51 30 15 8 9 957
Oklahoma 9 94 116 44 23 15 7 4 4 308
Oregon - 121 67 14 9 4 3 1 1 220
Pennsylvania - 305 217 73 39 27 15 11 19 708
Rhode Island - 42 8 3 2 0 0 0 0 55
South Carolina 6 218 100 24 20 10 5 3 2 382
South Dakota - 20 50 10 4 2 1 1 - 88
Tennessee 0 389 80 23 13 6 3 2 4 521
Texas 11 359 580 248 156 89 39 20 11 1,500
Utah - 76 107 40 19 14 5 1 0 263
Vermont - 29 15 5 3 0 0 0 0 52
Virginia - 216 257 67 31 19 12 8 7 617
Washington - 135 122 47 23 13 6 4 6 356
West Virginia 0 67 73 17 12 8 4 2 1 185
Wisconsin - 98 125 58 38 22 7 3 2 353
Wyoming - 42 32 11 7 6 4 2 2 106
U.S. Total 91 8,338 5,992 2,033 1,258 771 398 226 263 19,278
Puerto Rico 2 7 51 41 29 27 20 14 33 222
Grand Total 92 8,345 6,043 2,074 1,287 798 418 240 296 19,500

October 17, 2025

MILES BY MEASURED PAVEMENT ROUGHNESS - URBAN

INTERNATIONAL ROUGHNESS INDEX (IRI) (1)

Table HM-64
(Sheet 4 of 4)
STATE OTHER FREEWAYS & EXPRESSWAYS OTHER PRINCIPAL ARTERIAL
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 0 14 18 6 3 2 1 0 0 44 18 462 466 147 77 46 25 14 23 1,262
Alaska - - - - - - - - - - 0 22 46 27 18 11 6 4 9 142
Arizona 8 123 72 23 15 7 2 2 1 245 186 50 146 121 114 84 55 39 55 666
Arkansas 4 18 42 15 7 4 2 2 2 92 71 110 215 90 55 43 24 17 53 606
California 6 260 479 268 197 124 60 36 46 1,471 357 142 491 590 767 868 746 695 2,034 6,334
Colorado - 50 122 53 39 25 11 8 15 323 - 63 261 202 180 126 84 63 142 1,121
Connecticut 0 85 103 31 15 6 3 1 2 246 1 22 194 156 122 76 48 32 61 711
Delaware 0 6 23 7 3 1 0 0 0 40 15 28 87 33 19 10 8 5 11 202
District of Columbia 2 0 1 2 2 2 2 2 4 15 2 0 0 0 3 7 8 12 73 104
Florida 26 349 208 51 29 14 6 3 3 664 221 1,037 1,603 629 325 177 93 58 100 4,022
Georgia - 81 44 22 14 8 3 1 1 175 - 533 818 295 158 79 42 27 35 1,987
Hawaii 0 2 9 5 4 4 3 2 4 34 2 29 68 41 32 33 22 14 37 277
Idaho 0 15 12 5 2 1 1 1 1 39 77 45 116 52 36 27 17 13 44 351
Illinois - 36 27 15 12 9 6 4 5 114 3 300 661 495 407 300 199 149 330 2,841
Indiana 21 46 41 20 14 7 4 2 1 135 644 266 359 163 96 71 39 26 30 1,050
Iowa - - - - - - - - - - 14 101 233 198 147 103 59 44 87 973
Kansas 4 88 69 24 14 7 4 2 2 209 14 68 78 40 32 25 18 13 20 294
Kentucky 0 21 14 11 6 3 2 1 1 58 34 170 240 104 56 34 19 14 21 659
Louisiana 1 9 14 11 24 22 12 8 17 116 68 99 190 137 114 104 81 68 160 954
Maine 0 8 5 2 1 0 1 0 0 17 3 32 36 15 11 12 7 4 13 128
Maryland 0 96 117 27 13 9 6 4 7 279 5 117 254 123 92 73 56 50 174 938
Massachusetts 21 194 67 17 10 8 5 3 5 309 49 81 302 283 265 261 186 152 395 1,925
Michigan 0 129 140 44 22 10 5 4 7 362 473 203 434 347 272 203 136 110 221 1,926
Minnesota - 72 85 40 22 10 3 1 1 234 2 210 234 104 63 34 14 10 12 681
Mississippi - 19 23 12 4 4 1 1 1 66 1 141 268 148 113 81 52 38 101 943
Missouri 0 189 174 65 37 27 12 6 9 518 4 139 251 147 108 78 53 44 74 894
Montana - - - - - - - - - - - 33 67 40 28 24 15 14 27 247
Nebraska 0 20 61 25 14 10 5 4 5 145 13 11 45 39 37 39 31 27 83 312
Nevada - 16 8 6 5 2 1 0 1 39 0 110 99 60 36 29 13 12 18 378
New Hampshire - 46 10 3 1 1 0 0 - 61 0 73 83 30 19 15 8 4 11 244
New Jersey - 261 113 33 20 14 9 5 7 460 0 166 442 236 197 181 129 112 285 1,749
New Mexico - 0 1 2 3 3 2 0 0 12 2 95 166 111 97 82 55 43 114 762
New York 50 68 235 141 96 76 57 48 80 802 232 94 648 479 379 294 208 196 755 3,054
North Carolina 16 110 132 36 16 9 4 4 3 313 8 92 460 404 304 182 95 65 88 1,690
North Dakota - - - - - - - - - - 7 31 61 36 27 17 13 9 16 210
Ohio 3 200 238 67 41 25 13 6 6 597 13 229 617 401 323 259 178 133 319 2,459
Oklahoma 12 26 71 30 20 13 7 5 4 176 455 63 204 135 96 69 39 38 75 719
Oregon - 33 26 10 4 2 2 1 0 77 34 95 219 142 119 82 53 39 82 831
Pennsylvania 0 128 189 95 50 31 17 11 18 540 0 143 541 463 421 336 225 171 367 2,668
Rhode Island 0 29 28 10 7 4 2 1 2 83 13 17 37 31 45 49 36 37 89 340
South Carolina 2 42 34 11 7 3 1 1 0 100 13 147 436 234 159 99 53 29 34 1,192
South Dakota 7 1 6 4 3 1 1 0 0 15 3 13 31 21 19 17 11 9 10 131
Tennessee 26 75 34 11 8 4 2 2 3 139 286 428 545 207 124 81 46 30 55 1,516
Texas 41 259 527 281 185 105 44 21 14 1,437 104 571 1,497 970 698 547 361 289 742 5,676
Utah - 21 24 9 4 1 1 0 0 61 29 135 252 118 65 43 22 12 19 666
Vermont 0 4 6 3 1 1 - - 0 14 4 18 32 20 13 8 7 5 11 112
Virginia - 77 199 61 29 15 7 4 4 395 0 67 380 288 233 186 110 78 89 1,431
Washington 1 139 177 51 29 16 9 6 7 434 34 49 236 226 209 182 130 105 283 1,421
West Virginia 0 0 4 3 2 1 1 1 0 13 2 20 120 68 43 30 17 12 20 331
Wisconsin 0 71 95 62 37 28 12 5 3 314 24 137 232 234 250 241 177 149 352 1,772
Wyoming - 2 0 0 0 - 0 0 - 3 41 41 59 27 19 15 10 6 15 190
U.S. Total 254 3,540 4,124 1,732 1,093 679 355 220 293 12,035 3,582 7,347 15,557 9,711 7,645 6,075 4,143 3,337 8,275 62,089
Puerto Rico 1 2 12 9 6 6 4 4 11 53 9 0 9 24 43 52 49 48 133 358
Grand Total 255 3,543 4,136 1,741 1,099 685 359 223 304 12,088 3,591 7,347 15,566 9,735 7,688 6,127 4,192 3,385 8,408 62,447

(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. Includes structures.

(2) Includes unpaved miles and bridges.

(3) Estimated from sample data.

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