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FHWA Home / Policy & Governmental Affairs / Highway Policy Information / Highway Statistics Series / 2020 / Table HM-47 - Highway Statistics 2020

Highway Statistics Series

Highway Statistics 2020


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

October 26, 2021

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 - 428 88 24 15 7 3 3 2 571 5 994 770 124 54 27 14 7 7 1,997
Alaska 20 230 337 147 103 71 39 25 31 982 322 102 174 79 79 66 49 38 79 667
Arizona 7 558 193 71 44 22 10 5 5 909 11 337 390 196 120 77 36 17 19 1,192
Arkansas - 224 136 39 18 9 5 3 4 439 - 373 793 336 210 103 56 32 34 1,938
California - 472 378 149 100 56 26 13 16 1,209 58 957 1,616 616 343 186 81 52 79 3,930
Colorado - 106 295 114 52 27 27 18 10 648 - 587 1,090 448 217 114 59 35 27 2,576
Connecticut - 17 10 1 1 - - - - 29 - 27 66 34 16 7 4 2 1 157
Delaware - - - - - - - - - - - 40 72 16 5 2 2 1 1 138
District of Columbia - - - - - - - - - - - - - - - - - - - -
Florida - 622 77 10 5 2 1 - - 717 3 1,290 1,090 242 85 37 10 3 5 2,762
Georgia - 306 176 34 11 6 3 1 1 538 - 1,262 1,391 372 133 52 16 7 12 3,245
Hawaii - - - - - - - - - - 1 3 25 17 11 9 6 4 4 79
Idaho 2 340 123 29 12 5 1 2 8 519 7 599 716 172 78 38 24 16 52 1,695
Illinois - 800 306 71 32 18 7 4 5 1,243 - 433 900 437 267 173 88 51 59 2,408
Indiana - 441 207 53 30 16 9 6 6 769 - 779 618 188 93 37 15 7 7 1,745
Iowa - 265 233 61 31 12 4 2 3 610 34 907 1,169 568 334 185 107 60 63 3,392
Kansas - 380 177 50 19 9 3 1 1 640 1 1,689 1,019 169 74 42 18 11 9 3,031
Kentucky 1 521 132 29 13 9 3 2 1 710 6 701 554 209 101 41 16 10 7 1,638
Louisiana 3 191 136 89 64 31 11 3 1 527 4 117 445 236 139 84 49 27 28 1,125
Maine - 167 62 32 10 5 2 1 1 279 1 341 246 79 43 31 18 12 31 800
Maryland - 67 57 11 4 1 1 - 1 142 - 186 140 24 9 6 4 4 4 377
Massachusetts - 38 17 3 2 1 - - - 63 - 81 179 69 42 23 14 8 13 430
Michigan 4 188 249 59 29 17 8 5 4 558 - 954 995 279 128 64 32 15 17 2,483
Minnesota - 250 238 58 26 11 3 2 1 588 - 1,387 1,237 428 219 120 54 25 19 3,488
Mississippi - 370 143 28 17 12 5 2 2 578 - 494 771 244 153 81 34 17 19 1,812
Missouri - 610 176 29 15 6 2 1 1 842 - 1,302 1,174 307 120 54 20 12 11 3,001
Montana - 556 405 71 33 16 6 4 5 1,095 - 662 1,263 449 195 89 46 25 43 2,773
Nebraska - 219 146 30 13 4 1 1 1 415 1 1,079 945 284 158 98 52 29 36 2,682
Nevada - 409 33 8 4 2 - - - 457 - 912 462 95 42 20 8 4 2 1,544
New Hampshire - 115 21 4 1 1 - - - 142 - 177 133 31 17 11 8 4 6 387
New Jersey - 19 19 5 2 1 - - - 45 - 65 75 19 15 9 5 3 4 195
New Mexico - 501 200 60 37 22 12 5 7 843 - 581 691 224 118 64 33 17 21 1,749
New York 8 377 268 71 38 22 10 4 7 798 33 352 1,128 375 192 102 52 30 29 2,259
North Carolina 21 406 99 20 10 5 2 1 1 544 25 628 1,034 322 112 44 18 8 8 2,174
North Dakota - 351 130 19 6 2 1 1 - 510 - 1,477 975 253 111 52 27 17 33 2,945
Ohio - 374 171 46 26 13 6 3 4 643 1 637 811 249 104 49 21 11 12 1,893
Oklahoma 9 331 208 43 24 14 8 4 4 637 14 496 948 375 211 115 62 40 48 2,295
Oregon 2 278 158 36 13 5 1 1 1 494 4 637 1,330 379 157 75 35 21 19 2,653
Pennsylvania - 548 329 90 42 26 11 8 12 1,066 - 443 861 299 138 65 35 19 26 1,885
Rhode Island - 15 2 - - - - - - 18 - 17 19 15 19 16 11 6 4 108
South Carolina - 381 110 30 14 7 3 1 1 546 4 336 745 257 131 62 29 13 16 1,589
South Dakota - 267 259 46 13 4 2 1 - 591 - 882 1,173 429 213 100 47 27 18 2,889
Tennessee - 528 81 17 10 4 3 1 - 645 11 745 656 166 81 42 19 11 8 1,728
Texas 1 900 787 192 66 29 13 6 5 2,000 17 2,482 3,037 1,180 530 225 91 41 33 7,621
Utah - 363 247 53 14 5 1 - 1 685 - 245 514 228 120 49 16 6 5 1,183
Vermont 1 174 59 11 5 3 2 1 - 255 - 108 121 33 19 10 7 5 5 307
Virginia - 289 250 41 11 4 1 - - 598 - 305 903 319 145 55 21 8 5 1,760
Washington - 210 142 35 17 8 6 5 7 429 1 297 858 414 181 79 43 25 27 1,924
West Virginia - 137 128 23 14 7 3 3 5 319 7 137 389 217 120 66 33 21 30 1,013
Wisconsin 4 225 159 61 32 19 7 3 3 508 45 762 962 586 375 221 104 54 50 3,114
Wyoming - 494 203 56 27 14 7 3 2 807 54 572 873 280 118 43 17 6 6 1,914
U.S. Total 84 16,052 8,560 2,260 1,124 592 282 157 171 29,199 674 30,980 38,546 13,365 6,693 3,420 1,664 925 1,097 96,691
Puerto Rico 1 - 13 10 5 5 4 4 12 53 - - 5 8 10 12 8 7 17 68
Grand Total 85 16,053 8,573 2,270 1,129 598 286 160 183 29,252 674 30,980 38,551 13,374 6,703 3,432 1,672 933 1,115 96,759

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

October 26, 2021

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 1,422 858 148 69 34 17 10 9 2,568
Alaska 342 332 511 226 182 138 88 62 110 1,648
Arizona 18 895 583 268 164 99 46 22 24 2,101
Arkansas - 598 929 375 228 113 61 35 38 2,377
California 59 1,429 1,994 765 443 242 107 65 95 5,139
Colorado - 693 1,385 562 269 140 86 53 36 3,224
Connecticut - 44 76 35 17 7 4 2 1 186
Delaware - 40 72 16 5 2 2 1 1 138
District of Columbia - - - - - - - - - -
Florida 3 1,911 1,167 251 90 39 11 4 5 3,479
Georgia - 1,567 1,568 406 144 58 19 8 13 3,784
Hawaii 1 3 25 17 11 9 6 4 4 79
Idaho 9 939 839 201 90 43 25 18 59 2,214
Illinois - 1,233 1,206 507 299 191 95 55 64 3,652
Indiana - 1,220 826 241 123 53 24 14 13 2,514
Iowa 34 1,171 1,401 628 365 196 111 62 66 4,002
Kansas 1 2,069 1,196 220 93 50 21 12 10 3,670
Kentucky 7 1,222 686 238 114 50 19 12 7 2,348
Louisiana 6 308 581 325 202 115 60 30 30 1,651
Maine 1 508 308 111 53 36 19 13 31 1,080
Maryland - 254 197 35 13 7 5 4 4 519
Massachusetts - 120 196 73 45 24 15 8 13 492
Michigan 4 1,142 1,244 338 157 81 40 20 21 3,041
Minnesota - 1,638 1,474 486 245 131 56 26 20 4,076
Mississippi - 864 914 272 170 93 38 20 20 2,391
Missouri - 1,912 1,350 337 135 60 23 14 12 3,843
Montana - 1,218 1,669 520 228 105 52 29 48 3,868
Nebraska 1 1,298 1,092 314 170 101 54 30 37 3,096
Nevada - 1,321 495 103 45 22 9 4 2 2,001
New Hampshire - 292 153 35 18 12 8 4 6 529
New Jersey - 83 94 24 17 10 5 3 4 240
New Mexico - 1,082 891 284 155 87 45 22 28 2,593
New York 41 729 1,396 447 229 124 62 35 36 3,057
North Carolina 46 1,035 1,133 342 122 49 19 9 10 2,718
North Dakota - 1,828 1,106 271 117 54 28 18 33 3,455
Ohio 2 1,011 982 295 129 62 27 14 16 2,536
Oklahoma 24 827 1,156 419 235 129 70 44 51 2,932
Oregon 6 915 1,488 416 170 80 36 21 20 3,146
Pennsylvania - 990 1,189 388 180 91 46 28 39 2,951
Rhode Island - 33 21 16 19 17 11 6 4 126
South Carolina 4 717 854 287 145 69 32 15 17 2,135
South Dakota - 1,149 1,432 475 226 104 48 28 19 3,481
Tennessee 11 1,273 737 183 92 46 22 12 9 2,373
Texas 18 3,382 3,824 1,372 597 255 104 47 39 9,621
Utah - 608 761 281 134 54 17 7 6 1,868
Vermont 1 281 180 44 24 13 8 6 6 562
Virginia - 594 1,153 360 156 59 22 9 5 2,358
Washington 1 506 999 449 198 87 49 30 34 2,353
West Virginia 7 274 518 240 134 72 36 24 35 1,332
Wisconsin 49 986 1,121 647 407 240 112 57 52 3,622
Wyoming 54 1,065 1,077 336 145 57 24 9 8 2,721
U.S. Total 758 47,032 47,106 15,626 7,817 4,012 1,946 1,082 1,268 125,890
Puerto Rico 1 1 18 18 15 17 12 11 30 121
Grand Total 759 47,033 47,124 15,644 7,832 4,029 1,958 1,093 1,298 126,011

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

October 26, 2021

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 - 268 76 32 20 14 8 7 8 433 13 432 513 145 78 45 24 16 24 1,277
Alaska - 38 25 8 4 2 1 - 1 78 1 27 55 29 18 12 6 5 8 161
Arizona 8 135 71 19 10 5 3 1 1 245 20 162 201 135 113 83 53 34 40 820
Arkansas - 118 105 39 21 12 7 5 5 310 - 69 215 114 83 63 39 30 65 678
California 4 219 431 216 160 100 54 30 33 1,243 381 392 895 788 875 861 686 612 2,467 7,575
Colorado - 65 107 54 39 19 10 4 6 304 - 127 385 249 198 135 91 64 130 1,380
Connecticut - 148 119 27 13 6 3 1 2 318 14 97 275 181 132 93 55 39 72 944
Delaware - 9 15 7 3 3 1 1 1 40 1 35 112 47 22 13 9 6 11 256
District of Columbia - 1 3 3 2 1 1 1 - 12 1 1 3 2 5 7 8 12 83 121
Florida - 488 184 50 28 16 7 3 2 778 7 1,274 1,801 660 339 203 100 64 103 4,542
Georgia - 439 163 53 29 15 6 2 2 709 - 758 1,105 379 206 123 63 45 69 2,747
Hawaii - 1 10 10 10 9 7 4 3 55 9 25 60 56 49 38 23 18 40 311
Idaho 1 53 27 5 3 2 1 - - 92 2 61 96 32 19 12 10 6 20 255
Illinois - 382 340 80 55 39 22 10 13 942 2 213 759 580 456 340 224 177 406 3,156
Indiana - 222 132 60 35 22 10 5 6 492 5 210 227 97 59 40 20 12 17 682
Iowa - 54 72 23 12 8 3 3 3 178 21 96 204 181 137 92 62 48 99 919
Kansas 1 129 56 23 13 6 4 2 1 235 1 132 159 66 48 38 24 17 26 509
Kentucky 2 114 67 22 13 8 3 1 1 230 35 143 238 134 73 41 24 16 22 691
Louisiana 10 122 95 53 49 46 23 14 12 414 51 104 229 157 141 125 90 72 161 1,078
Maine - 55 22 6 2 2 1 - - 87 12 25 38 24 18 13 10 6 15 148
Maryland - 136 121 29 15 11 6 6 11 336 6 243 387 165 113 90 65 57 191 1,311
Massachusetts 3 340 95 25 15 12 6 4 5 502 44 220 373 293 283 280 199 167 490 2,305
Michigan 3 132 304 91 53 40 22 15 15 673 36 206 622 449 358 286 206 165 407 2,699
Minnesota - 102 140 43 18 12 6 2 2 325 1 226 331 141 69 37 18 10 15 848
Mississippi - 153 55 17 12 9 5 3 1 253 - 125 312 178 118 80 53 39 92 997
Missouri - 307 136 38 26 16 8 5 4 538 - 324 426 196 126 100 58 42 76 1,347
Montana - 47 39 6 3 1 1 1 - 98 - 27 59 38 25 21 13 10 26 219
Nebraska - 19 28 12 5 2 2 1 - 69 3 29 93 58 51 50 38 35 107 461
Nevada - 84 30 20 17 7 3 1 1 162 - 115 114 60 49 32 18 11 20 419
New Hampshire - 71 10 2 - - - - - 83 - 129 81 34 24 17 10 7 17 319
New Jersey - 135 143 36 23 13 12 9 16 387 - 316 562 293 250 218 170 146 386 2,341
New Mexico - 83 42 11 8 6 3 1 2 156 - 72 95 60 51 33 21 14 34 380
New York 9 230 333 143 79 51 30 21 36 923 111 154 927 614 487 380 290 247 832 3,931
North Carolina 13 440 221 64 25 12 9 4 5 780 23 351 708 429 268 151 80 49 71 2,107
North Dakota - 31 22 5 2 - - - - 61 1 34 53 33 28 19 11 9 18 205
Ohio 3 436 279 90 53 30 19 11 12 931 11 333 631 326 253 192 129 98 240 2,201
Oklahoma 2 98 105 35 17 13 7 4 5 284 14 97 218 113 82 51 30 22 38 651
Oregon 2 110 81 18 10 7 4 2 1 233 16 102 278 164 122 84 51 38 71 910
Pennsylvania - 297 285 85 52 30 16 12 21 797 4 295 831 604 478 376 247 173 408 3,414
Rhode Island - 29 17 3 1 1 1 - - 52 6 35 46 43 52 52 45 40 105 418
South Carolina - 171 84 25 14 7 2 1 - 304 41 93 371 235 167 109 60 37 46 1,117
South Dakota - 21 46 13 5 2 1 - - 88 2 11 38 28 24 19 16 9 10 154
Tennessee - 383 105 34 16 9 4 2 2 556 4 559 703 275 174 117 66 54 108 2,057
Texas 4 385 551 236 144 83 34 14 10 1,457 81 795 1,884 1,181 854 630 407 335 818 6,905
Utah - 76 108 35 18 10 4 2 1 253 - 140 261 126 72 42 21 14 21 697
Vermont - 35 22 4 1 1 1 - - 64 2 14 32 14 9 7 3 4 5 87
Virginia - 168 234 62 27 16 8 4 2 521 - 139 559 345 257 184 114 77 89 1,765
Washington - 138 118 39 18 12 5 3 2 335 15 179 461 291 241 186 129 102 265 1,854
West Virginia 1 100 69 18 15 12 7 4 10 235 3 44 153 81 46 31 16 12 26 411
Wisconsin - 102 110 63 45 26 13 4 2 366 46 85 285 302 311 287 169 144 313 1,896
Wyoming - 41 28 16 8 5 3 2 2 106 3 30 57 30 20 12 9 8 10 177
U.S. Total 69 7,962 6,080 2,109 1,267 790 412 234 267 19,120 1,051 9,908 19,520 11,255 8,532 6,550 4,382 3,469 9,234 72,851
Puerto Rico 3 3 44 40 34 27 21 18 40 227 11 1 15 24 42 55 52 50 175 412
Grand Total 72 7,965 6,123 2,148 1,301 818 432 253 306 19,347 1,063 9,909 19,536 11,279 8,574 6,604 4,434 3,519 9,409 73,263

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

October 26, 2021

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 14 700 589 177 98 60 32 22 32 1,709
Alaska 1 65 80 37 23 14 6 6 9 239
Arizona 28 296 271 154 123 89 55 35 41 1,065
Arkansas - 186 320 153 104 75 45 34 70 989
California 385 611 1,326 1,004 1,035 961 740 642 2,500 8,818
Colorado - 192 492 303 237 154 101 68 137 1,683
Connecticut 14 246 394 207 144 99 58 40 74 1,261
Delaware 1 44 128 54 25 17 11 7 12 296
District of Columbia 1 1 6 6 7 8 10 13 83 133
Florida 7 1,762 1,984 710 367 218 107 67 105 5,320
Georgia - 1,197 1,268 432 235 138 69 47 71 3,456
Hawaii 10 27 71 66 59 47 31 22 43 366
Idaho 3 114 123 37 22 14 11 6 21 347
Illinois 2 595 1,100 661 511 379 246 187 420 4,098
Indiana 5 433 359 157 94 62 29 17 23 1,173
Iowa 21 150 276 204 150 99 65 51 102 1,096
Kansas 2 261 214 89 61 44 28 19 27 743
Kentucky 37 258 305 156 86 49 27 17 23 921
Louisiana 61 226 324 210 190 171 113 86 173 1,492
Maine 12 80 59 29 20 15 10 6 15 235
Maryland 6 379 508 194 128 101 71 63 203 1,647
Massachusetts 47 559 468 318 298 292 205 171 495 2,807
Michigan 39 339 926 540 411 326 228 180 422 3,371
Minnesota 1 329 471 184 87 49 24 13 17 1,174
Mississippi - 277 367 195 130 88 58 41 93 1,250
Missouri - 631 562 234 152 116 66 47 79 1,886
Montana - 74 98 43 28 22 14 10 27 317
Nebraska 3 49 121 70 56 52 39 36 108 530
Nevada - 199 144 80 67 39 20 12 21 581
New Hampshire - 201 91 35 24 17 10 7 17 402
New Jersey - 452 706 330 273 230 181 154 402 2,728
New Mexico - 155 137 71 59 39 24 16 36 536
New York 121 384 1,260 758 565 431 320 268 867 4,853
North Carolina 36 792 929 493 294 163 89 53 76 2,888
North Dakota 1 65 75 37 31 20 11 9 18 266
Ohio 13 769 910 416 307 222 148 109 251 3,132
Oklahoma 17 196 323 148 99 65 37 26 43 935
Oregon 18 212 359 182 131 91 55 40 72 1,142
Pennsylvania 4 592 1,115 690 530 406 264 185 429 4,211
Rhode Island 6 64 63 46 53 53 46 40 105 470
South Carolina 41 264 456 260 181 115 62 38 46 1,422
South Dakota 2 32 84 40 29 21 17 9 10 242
Tennessee 4 943 808 308 191 126 70 56 111 2,613
Texas 85 1,180 2,435 1,417 998 713 441 349 828 8,362
Utah - 215 369 161 90 52 25 16 22 950
Vermont 2 49 54 18 10 8 3 4 6 151
Virginia - 307 793 407 284 200 123 81 91 2,285
Washington 15 317 579 330 259 198 133 105 267 2,188
West Virginia 5 144 221 100 61 44 23 17 36 646
Wisconsin 46 187 395 365 357 314 182 148 315 2,262
Wyoming 3 72 85 46 28 17 12 10 12 282
U.S. Total 1,120 17,870 25,600 13,363 9,799 7,340 4,794 3,703 9,501 91,971
Puerto Rico 14 4 59 64 76 82 72 68 215 639
Grand Total 1,134 17,874 25,659 13,427 9,875 7,422 4,866 3,771 9,715 92,610

(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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