U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
202-366-4000

Skip to content
Facebook iconYouTube iconTwitter iconFlickr iconLinkedInInstagram

Policy and Governmental Affairs
Office of Highway Policy Information

FHWA Home / Policy & Governmental Affairs / Highway Policy Information / Highway Statistics Series / 2020 / Table HM-64 - Highway Statistics 2020

Highway Statistics Series

Highway Statistics 2020


Printable Excel Version [168 KB]
Printable PDF Version [241 KB]

Functional System Length - 2020

October 26, 2021

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 - 428 88 24 15 7 3 3 2 571
Alaska 20 230 337 147 103 71 39 25 31 982
Arizona 7 558 193 71 44 22 10 5 5 909
Arkansas - 224 136 39 18 9 5 3 4 439
California - 472 378 149 100 56 26 13 16 1,209
Colorado - 106 295 114 52 27 27 18 10 648
Connecticut - 17 10 1 1 - - - - 29
Delaware - - - - - - - - - -
District of Columbia - - - - - - - - - -
Florida - 622 77 10 5 2 1 - - 717
Georgia - 306 176 34 11 6 3 1 1 538
Hawaii - - - - - - - - - -
Idaho 2 340 123 29 12 5 1 2 8 519
Illinois - 800 306 71 32 18 7 4 5 1,243
Indiana - 441 207 53 30 16 9 6 6 769
Iowa - 265 233 61 31 12 4 2 3 610
Kansas - 380 177 50 19 9 3 1 1 640
Kentucky 1 521 132 29 13 9 3 2 1 710
Louisiana 3 191 136 89 64 31 11 3 1 527
Maine - 167 62 32 10 5 2 1 1 279
Maryland - 67 57 11 4 1 1 - 1 142
Massachusetts - 38 17 3 2 1 - - - 63
Michigan 4 188 249 59 29 17 8 5 4 558
Minnesota - 250 238 58 26 11 3 2 1 588
Mississippi - 370 143 28 17 12 5 2 2 578
Missouri - 610 176 29 15 6 2 1 1 842
Montana - 556 405 71 33 16 6 4 5 1,095
Nebraska - 219 146 30 13 4 1 1 1 415
Nevada - 409 33 8 4 2 - - - 457
New Hampshire - 115 21 4 1 1 - - - 142
New Jersey - 19 19 5 2 1 - - - 45
New Mexico - 501 200 60 37 22 12 5 7 843
New York 8 377 268 71 38 22 10 4 7 798
North Carolina 21 406 99 20 10 5 2 1 1 544
North Dakota - 351 130 19 6 2 1 1 - 510
Ohio - 374 171 46 26 13 6 3 4 643
Oklahoma 9 331 208 43 24 14 8 4 4 637
Oregon 2 278 158 36 13 5 1 1 1 494
Pennsylvania - 548 329 90 42 26 11 8 12 1,066
Rhode Island - 15 2 - - - - - - 18
South Carolina - 381 110 30 14 7 3 1 1 546
South Dakota - 267 259 46 13 4 2 1 - 591
Tennessee - 528 81 17 10 4 3 1 - 645
Texas 1 900 787 192 66 29 13 6 5 2,000
Utah - 363 247 53 14 5 1 - 1 685
Vermont 1 174 59 11 5 3 2 1 - 255
Virginia - 289 250 41 11 4 1 - - 598
Washington - 210 142 35 17 8 6 5 7 429
West Virginia - 137 128 23 14 7 3 3 5 319
Wisconsin 4 225 159 61 32 19 7 3 3 508
Wyoming - 494 203 56 27 14 7 3 2 807
U.S. Total 84 16,052 8,560 2,260 1,124 592 282 157 171 29,199
Puerto Rico 1 - 13 10 5 5 4 4 12 53
Grand Total 85 16,053 8,573 2,270 1,129 598 286 160 183 29,252

October 26, 2021

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 - - - - - - - - - - 5 1,015 791 129 55 28 14 7 7 2,047 22 1,008 2,253 426 171 33 24 4 16 3,935
Alaska - - - - - - - - - - 321 80 127 52 50 42 33 27 66 478 105 40 82 44 48 48 27 17 19 326
Arizona - 6 6 3 2 1 - - - 19 22 358 419 204 119 76 35 17 14 1,241 33 268 700 434 309 221 116 61 44 2,153
Arkansas - 15 29 11 8 5 3 1 1 72 - 358 763 328 206 102 54 31 34 1,877 33 352 1,251 598 363 242 124 42 63 3,035
California 3 115 175 57 40 16 5 3 8 420 61 858 1,387 496 262 141 66 45 77 3,333 2,614 428 1,205 660 494 378 201 128 133 3,626
Colorado - 5 9 8 4 1 - - - 28 - 594 1,089 441 213 112 58 35 27 2,569 288 121 958 694 565 368 170 134 175 3,186
Connecticut - 18 15 2 1 - - - - 36 - 9 51 32 16 7 4 2 1 122 - 7 75 44 42 23 10 8 8 218
Delaware - 10 14 3 1 1 - - - 29 - 28 52 12 4 1 1 1 1 99 - 28 47 10 3 1 - - - 90
District of Columbia - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Florida - 123 42 5 2 1 - - - 174 22 1,166 1,057 237 83 36 10 3 4 2,597 127 659 998 260 87 29 10 9 6 2,059
Georgia - - - - - - - - - - - 1,000 1,032 247 89 35 11 6 9 2,428 - 1,221 2,215 663 316 123 66 34 85 4,724
Hawaii - - - - - - - - - - 1 3 24 17 11 9 6 4 3 77 - 41 56 35 42 31 18 13 19 255
Idaho - 23 13 2 1 - - - - 40 29 591 715 173 79 37 24 16 54 1,689 146 281 570 165 91 37 27 23 126 1,320
Illinois - 9 14 10 7 4 1 1 1 48 - 424 886 426 260 169 87 49 58 2,360 - 376 1,731 1,208 699 358 175 117 59 4,722
Indiana - 68 48 22 9 4 1 1 1 153 11 838 730 217 107 44 18 8 7 1,970 136 547 896 281 119 53 30 13 18 1,957
Iowa - - - - - - - - - - 35 907 1,168 567 333 183 106 60 62 3,387 3,911 - - - - - - - - -
Kansas - 195 171 23 7 4 2 1 - 402 1 1,494 849 147 67 38 16 10 9 2,629 2 1,727 1,553 535 247 133 20 19 19 4,254
Kentucky 2 263 104 17 6 3 1 1 - 396 7 437 446 188 92 36 14 9 6 1,229 35 303 1,010 610 238 92 29 12 12 2,306
Louisiana - - 9 5 6 3 2 1 6 34 3 110 391 211 125 78 44 26 23 1,008 12 175 678 408 267 168 78 56 49 1,879
Maine - 1 1 - - - - - - 3 - 340 243 77 42 30 17 12 31 792 37 190 292 116 85 70 48 34 69 904
Maryland - 41 24 2 1 - - - 1 69 - 149 122 23 9 6 4 4 3 321 - 243 294 112 39 13 4 3 1 707
Massachusetts - 3 6 1 - - - - - 10 - 30 36 18 10 5 3 1 1 105 - 62 131 35 28 22 15 5 7 306
Michigan - 171 131 23 6 6 4 2 1 343 - 781 861 253 121 57 28 13 15 2,130 36 1,172 2,316 701 263 167 92 68 72 4,851
Minnesota - 17 11 4 2 - 1 - - 34 - 1,370 1,226 424 217 119 53 25 19 3,453 8 2,182 1,705 1,047 943 403 207 102 80 6,669
Mississippi - - - - - - - - - - - 493 762 239 146 78 32 16 16 1,783 - 592 1,407 619 448 317 206 102 63 3,754
Missouri - 643 368 71 27 11 3 2 2 1,125 - 666 818 239 91 40 17 10 9 1,890 - 353 1,363 1,083 577 328 169 85 44 4,002
Montana - - - - - - - - - - - 662 1,263 449 195 89 46 25 43 2,773 - 419 1,241 535 283 189 84 51 49 2,850
Nebraska - 92 138 53 26 10 5 4 3 331 1 981 805 232 129 85 47 25 33 2,338 80 2,189 985 429 223 138 63 32 41 4,100
Nevada - - - - - - - - - - - 910 448 90 40 18 8 4 2 1,519 - 92 392 160 49 19 8 4 2 726
New Hampshire - 9 1 - - - - - - 9 - 156 112 25 12 8 6 2 3 323 - 158 225 77 62 39 24 16 25 625
New Jersey - 11 17 5 2 1 - - - 35 - 54 59 14 13 8 5 3 4 160 - 42 106 60 53 22 11 7 7 307
New Mexico - - - - - - - - - - - 598 745 263 146 80 40 20 24 1,916 - 303 525 347 249 213 152 131 356 2,275
New York - 23 82 33 23 12 6 3 2 184 34 329 1,044 342 168 90 45 27 26 2,072 2 186 1,439 722 218 48 73 18 102 2,807
North Carolina 10 219 146 27 9 5 3 1 2 413 25 370 808 257 96 38 14 6 6 1,596 135 140 1,429 570 353 199 79 85 72 2,926
North Dakota - - - - - - - - - - - 1,476 975 253 111 52 27 17 33 2,945 - 848 1,144 280 118 54 25 14 44 2,526
Ohio - 144 115 45 18 7 3 1 1 335 1 489 677 195 84 41 18 9 9 1,522 508 664 922 359 116 41 17 16 20 2,155
Oklahoma 11 - 1 - - - - - - 2 13 481 925 367 206 112 60 39 46 2,236 137 419 1,214 433 252 123 59 25 13 2,538
Oregon - - - - - - - - - - 4 637 1,332 379 156 75 34 21 19 2,652 28 189 982 507 272 135 51 29 34 2,198
Pennsylvania - 122 145 42 23 13 6 4 5 360 2 334 744 263 118 53 29 16 21 1,579 - 405 1,527 1,221 563 335 164 60 163 4,438
Rhode Island - 6 4 1 - - - - - 11 - 11 16 14 18 16 11 6 4 97 - 8 11 12 11 12 7 5 6 72
South Carolina 3 21 16 3 1 1 1 - - 43 3 316 728 254 130 61 28 13 15 1,546 18 426 1,175 622 369 223 80 39 33 2,966
South Dakota - 156 87 25 14 6 3 1 - 291 - 726 1,085 401 198 94 44 26 18 2,591 141 737 1,128 476 241 136 64 26 11 2,821
Tennessee - 12 11 2 1 1 - - - 26 203 736 648 164 79 41 19 10 8 1,705 2,711 47 64 17 4 - 4 - - 136
Texas - 45 57 19 5 2 1 - - 129 23 2,611 3,381 1,349 599 249 105 48 34 8,376 8 1,889 3,897 2,112 1,316 724 322 143 92 10,493
Utah - - 4 2 2 1 - - - 9 - 249 527 226 116 47 16 6 5 1,191 1 165 459 276 178 114 50 25 23 1,291
Vermont - - - - - - - - - 1 1 114 130 35 20 11 7 5 6 329 6 86 279 124 81 53 35 23 46 728
Virginia - 27 52 12 3 1 - - - 95 1 278 843 298 135 49 20 8 5 1,635 16 178 1,740 1,033 420 136 46 16 8 3,576
Washington - 119 264 123 47 20 16 11 11 612 1 177 597 291 133 58 27 13 16 1,312 32 179 610 435 307 218 120 68 91 2,029
West Virginia - - - - - - - - - - 7 137 389 217 120 66 33 21 30 1,012 75 36 449 342 209 115 60 30 38 1,278
Wisconsin - 26 76 40 30 23 5 2 1 203 45 704 869 536 341 191 93 49 43 2,825 30 1,320 1,058 788 372 490 293 143 270 4,735
Wyoming - - - - - - - - - - 55 572 873 280 118 43 17 6 6 1,914 194 323 400 164 81 36 12 6 3 1,026
U.S. Total 29 2,757 2,407 700 333 163 76 42 46 6,525 939 28,208 36,067 12,590 6,289 3,185 1,556 866 1,016 89,778 11,668 23,826 47,186 22,886 12,884 7,470 3,769 2,102 2,736 122,859
Puerto Rico - - 1 - - - - - - 2 - - 4 8 10 12 8 7 17 66 113 - - - 3 9 9 22 99 142
Grand Total 29 2,758 2,408 701 334 163 76 42 47 6,527 939 28,208 36,071 12,598 6,299 3,196 1,564 873 1,034 89,844 11,781 23,826 47,186 22,886 12,887 7,479 3,777 2,123 2,835 123,000

October 26, 2021

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 - 268 76 32 20 14 8 7 8 433
Alaska - 38 25 8 4 2 1 - 1 78
Arizona 8 135 71 19 10 5 3 1 1 245
Arkansas - 118 105 39 21 12 7 5 5 310
California 4 219 431 216 160 100 54 30 33 1,243
Colorado - 65 107 54 39 19 10 4 6 304
Connecticut - 148 119 27 13 6 3 1 2 318
Delaware - 9 15 7 3 3 1 1 1 40
District of Columbia - 1 3 3 2 1 1 1 - 12
Florida - 488 184 50 28 16 7 3 2 778
Georgia - 439 163 53 29 15 6 2 2 709
Hawaii - 1 10 10 10 9 7 4 3 55
Idaho 1 53 27 5 3 2 1 - - 92
Illinois - 382 340 80 55 39 22 10 13 942
Indiana - 222 132 60 35 22 10 5 6 492
Iowa - 54 72 23 12 8 3 3 3 178
Kansas 1 129 56 23 13 6 4 2 1 235
Kentucky 2 114 67 22 13 8 3 1 1 230
Louisiana 10 122 95 53 49 46 23 14 12 414
Maine - 55 22 6 2 2 1 - - 87
Maryland - 136 121 29 15 11 6 6 11 336
Massachusetts 3 340 95 25 15 12 6 4 5 502
Michigan 3 132 304 91 53 40 22 15 15 673
Minnesota - 102 140 43 18 12 6 2 2 325
Mississippi - 153 55 17 12 9 5 3 1 253
Missouri - 307 136 38 26 16 8 5 4 538
Montana - 47 39 6 3 1 1 1 - 98
Nebraska - 19 28 12 5 2 2 1 - 69
Nevada - 84 30 20 17 7 3 1 1 162
New Hampshire - 71 10 2 - - - - - 83
New Jersey - 135 143 36 23 13 12 9 16 387
New Mexico - 83 42 11 8 6 3 1 2 156
New York 9 230 333 143 79 51 30 21 36 923
North Carolina 13 440 221 64 25 12 9 4 5 780
North Dakota - 31 22 5 2 - - - - 61
Ohio 3 436 279 90 53 30 19 11 12 931
Oklahoma 2 98 105 35 17 13 7 4 5 284
Oregon 2 110 81 18 10 7 4 2 1 233
Pennsylvania - 297 285 85 52 30 16 12 21 797
Rhode Island - 29 17 3 1 1 1 - - 52
South Carolina - 171 84 25 14 7 2 1 - 304
South Dakota - 21 46 13 5 2 1 - - 88
Tennessee - 383 105 34 16 9 4 2 2 556
Texas 4 385 551 236 144 83 34 14 10 1,457
Utah - 76 108 35 18 10 4 2 1 253
Vermont - 35 22 4 1 1 1 - - 64
Virginia - 168 234 62 27 16 8 4 2 521
Washington - 138 118 39 18 12 5 3 2 335
West Virginia 1 100 69 18 15 12 7 4 10 235
Wisconsin - 102 110 63 45 26 13 4 2 366
Wyoming - 41 28 16 8 5 3 2 2 106
U.S. Total 69 7,962 6,080 2,109 1,267 790 412 234 267 19,120
Puerto Rico 3 3 44 40 34 27 21 18 40 227
Grand Total 72 7,965 6,123 2,148 1,301 818 432 253 306 19,347

October 26, 2021

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 - 10 13 5 2 2 1 - - 33 11 433 521 143 79 44 23 16 25 1,284
Alaska - - - - - - - - - - - 22 48 26 17 11 4 4 6 139
Arizona 13 112 82 24 13 6 2 1 1 239 191 56 145 131 111 87 56 36 42 664
Arkansas - 12 40 18 10 8 6 5 3 102 14 61 184 111 80 60 35 26 61 618
California 5 258 459 263 212 134 60 35 44 1,466 542 140 437 531 663 716 616 580 2,434 6,117
Colorado - 60 136 55 34 17 10 6 7 325 - 71 250 196 166 120 83 59 121 1,067
Connecticut - 82 104 27 16 8 3 2 2 243 14 15 171 154 115 84 52 37 70 698
Delaware - 5 22 6 3 1 1 - - 39 1 28 88 40 19 12 9 6 11 213
District of Columbia - - 2 2 3 2 2 1 3 15 1 - 1 1 2 5 6 11 80 106
Florida - 286 212 50 25 16 6 4 3 602 74 1,001 1,587 598 301 175 85 53 81 3,880
Georgia - 73 46 19 16 9 5 3 4 174 6 647 980 330 170 99 50 34 46 2,356
Hawaii - 1 10 7 6 4 2 1 4 34 7 25 50 47 42 30 20 15 32 261
Idaho - 9 6 1 1 - - - - 18 72 68 124 49 28 20 16 10 48 362
Illinois - 27 34 16 14 11 6 6 5 118 1 185 719 551 426 313 206 155 331 2,887
Indiana 3 48 47 24 17 10 5 2 2 155 27 301 511 274 203 154 91 70 114 1,717
Iowa - - - - - - - - - - 26 95 201 178 134 89 59 46 94 897
Kansas - 66 72 23 13 8 6 2 2 192 - 66 87 42 35 29 18 14 22 312
Kentucky 2 20 15 12 8 3 2 1 - 62 24 123 221 119 64 37 22 15 22 622
Louisiana 2 5 15 10 27 22 11 8 16 115 67 87 206 146 115 104 80 66 152 956
Maine - 6 6 2 1 - 1 - - 16 10 20 31 19 15 11 8 4 13 120
Maryland - 103 125 32 18 12 7 6 8 311 4 154 275 136 99 77 58 50 172 1,022
Massachusetts 2 154 100 26 13 11 6 4 8 321 31 66 270 264 266 264 188 158 465 1,940
Michigan - 73 168 54 26 12 7 6 6 353 34 133 452 391 329 271 197 157 394 2,323
Minnesota - 61 93 37 15 9 3 2 1 220 6 164 234 103 53 27 14 8 11 612
Mississippi - 9 29 11 6 4 2 2 1 64 - 116 287 171 116 78 52 38 94 952
Missouri - 196 167 55 29 24 10 7 6 493 - 127 263 147 100 80 48 36 71 871
Montana - - - - - - - - - - - 27 63 41 31 25 17 13 38 256
Nebraska 1 17 48 20 13 10 5 7 9 130 8 13 44 38 37 38 30 26 91 317
Nevada 1 21 12 8 9 3 1 - - 54 1 111 102 50 40 29 17 11 19 378
New Hampshire - 60 10 2 1 - - - - 74 - 66 66 30 21 14 9 5 13 223
New Jersey - 180 153 48 22 19 10 8 12 453 - 135 402 236 219 191 151 129 336 1,799
New Mexico - 1 3 3 3 1 1 - - 12 2 82 150 107 94 76 53 40 99 700
New York 23 53 243 133 99 78 59 44 79 789 102 100 676 475 377 291 225 195 731 3,071
North Carolina 14 188 167 41 20 10 7 3 4 440 21 191 634 448 301 175 89 56 82 1,977
North Dakota - - - - - - - - - - 1 34 53 33 29 19 11 9 18 207
Ohio 1 177 218 75 45 26 16 11 12 581 48 221 600 371 294 240 166 138 369 2,398
Oklahoma 13 44 74 27 18 11 6 2 3 185 436 76 218 134 96 65 43 35 71 739
Oregon 1 23 29 9 3 2 1 - - 68 17 84 250 156 117 81 49 36 65 839
Pennsylvania - 102 209 109 58 34 18 10 17 556 6 196 637 500 422 343 227 162 380 2,866
Rhode Island 5 28 23 10 6 4 2 2 2 77 2 8 23 33 46 48 44 38 102 341
South Carolina 1 21 30 13 7 5 2 2 1 81 43 71 339 219 158 103 57 34 43 1,024
South Dakota - 1 6 4 3 2 1 - - 18 2 10 32 24 21 17 15 9 9 136
Tennessee - 90 45 17 13 7 3 2 2 179 125 471 650 253 157 104 59 48 91 1,833
Texas 10 236 539 285 168 93 37 19 10 1,386 78 625 1,535 995 760 594 412 350 894 6,165
Utah - 19 19 7 2 1 - - - 49 7 122 244 120 72 41 23 14 21 656
Vermont - 2 9 3 1 - - - - 15 3 19 43 22 14 10 5 5 9 125
Virginia 2 82 184 52 24 12 5 2 1 362 - 57 366 282 225 165 105 71 83 1,353
Washington 5 119 185 53 27 15 7 6 6 417 30 60 276 236 212 169 117 92 247 1,409
West Virginia - 1 2 3 2 2 1 1 3 14 4 44 150 79 45 30 15 11 23 396
Wisconsin 3 42 87 84 56 37 15 9 8 338 65 61 249 278 319 301 193 162 327 1,891
Wyoming - 2 - - - - - - - 3 39 31 64 33 21 13 9 8 11 191
U.S. Total 109 3,186 4,299 1,787 1,128 706 360 231 296 11,992 2,205 7,120 16,210 10,088 7,872 6,179 4,234 3,401 9,185 64,288
Puerto Rico 1 - 8 6 5 5 4 5 17 51 8 - 7 18 37 49 47 43 161 363
Grand Total 110 3,186 4,307 1,793 1,133 711 364 236 314 12,043 2,213 7,120 16,217 10,106 7,909 6,228 4,282 3,444 9,345 64,651

(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.

Return to top

Page last modified on February 4, 2022
Privacy Policy | Freedom of Information Act (FOIA) | Accessibility | Web Policies & Notices | No Fear Act | Report Waste, Fraud and Abuse | U.S. DOT Home | USA.gov | WhiteHouse.gov

Federal Highway Administration | 1200 New Jersey Avenue, SE | Washington, DC 20590 | 202-366-4000