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 / 2018 / Table HM-64 - Highway Statistics 2018

Highway Statistics Series

Highway Statistics 2018


Printable Excel Version [198 KB]
Printable PDF Version [221 KB]

Functional System Length - 2019
    Daily Vehicle - Miles of Travel by Measured Pavement Roughness / Present Serviceability Rating

August 30, 2019

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 3 409 104 22 16 9 3 2 2 567
Alaska - 204 330 152 113 86 49 30 38 1,002
Arizona 2 538 223 78 38 16 11 5 5 915
Arkansas - 235 139 33 15 9 3 3 3 439
California 9 520 369 144 76 33 16 8 11 1,177
Colorado - 135 288 117 39 25 23 15 6 648
Connecticut - 17 6 3 1 1 - - - 29
Delaware - - - - - - - - - -
District of Columbia - - - - - - - - - -
Florida - 601 97 7 6 3 2 1 1 717
Georgia - 215 224 57 23 9 6 2 2 537
Hawaii - - - - - - - - - -
Idaho 1 309 152 32 16 7 3 1 2 522
Illinois - 741 365 76 31 17 6 4 4 1,243
Indiana 13 433 189 65 31 19 13 9 12 771
Iowa 26 288 205 57 22 7 3 2 2 585
Kansas - 391 179 44 16 6 2 1 - 639
Kentucky 2 504 137 32 19 10 4 1 2 709
Louisiana 7 193 134 87 65 29 11 4 2 526
Maine - 154 76 26 13 6 2 1 1 279
Maryland - 66 57 11 5 1 - - 1 142
Massachusetts - 34 22 4 2 1 - 1 - 64
Michigan 4 182 238 67 34 20 9 6 3 558
Minnesota - 192 295 50 29 11 5 3 3 588
Mississippi - 387 115 31 22 13 6 2 2 578
Missouri - 585 200 31 14 7 3 1 1 842
Montana - 573 397 68 29 14 5 3 4 1,094
Nebraska 3 213 145 25 15 9 3 1 1 412
Nevada 7 400 28 10 3 3 3 1 1 450
New Hampshire - 112 24 4 2 1 - - - 142
New Jersey - 17 23 3 1 - - 1 - 45
New Mexico - 561 176 55 27 14 5 2 3 843
New York 11 316 305 85 44 19 8 6 8 793
North Carolina 1 386 123 23 15 7 4 2 - 560
North Dakota - 253 204 37 10 3 1 1 - 510
Ohio - 346 196 56 23 12 5 2 3 643
Oklahoma 1 286 261 49 24 13 6 5 3 645
Oregon - 280 158 37 13 4 1 1 1 495
Pennsylvania - 519 365 89 56 20 9 8 9 1,074
Rhode Island - 15 2 - - - - - - 18
South Carolina - 360 132 30 14 6 2 1 1 546
South Dakota - 219 313 36 13 6 3 1 - 591
Tennessee - 519 92 14 10 5 2 2 - 644
Texas 1 894 821 181 62 27 8 4 3 2,000
Utah - 378 236 52 11 5 2 1 1 684
Vermont 1 176 60 11 6 2 1 - - 255
Virginia - 272 268 40 11 6 1 - - 598
Washington - 170 145 41 28 18 10 8 9 429
West Virginia - 159 111 24 12 6 4 1 2 319
Wisconsin - 247 136 46 42 23 8 6 4 512
Wyoming - 483 211 62 28 14 5 2 3 807
U.S. Total 92 15,486 9,074 2,302 1,143 585 279 160 158 29,188
Puerto Rico (4) - - 1 10 4 11 5 4 7 42
Grand Total 92 15,486 9,075 2,312 1,147 596 284 164 165 29,230

August 30, 2019

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 - - - - - - - - - - 4 964 813 138 51 28 12 8 11 2,025 21 900 2,219 495 199 80 27 19 24 3,963
Alaska - - - - - - - - - - 321 60 106 46 45 46 35 33 108 479 83 40 51 33 49 47 36 31 49 335
Arizona - 17 - - - - - - - 18 43 385 398 166 104 58 28 16 13 1,168 10 196 435 225 158 93 53 21 15 1,197
Arkansas - 2 25 19 13 7 4 1 - 72 - 354 824 322 186 100 46 25 21 1,877 23 282 1,293 564 348 269 114 85 65 3,019
California 4 114 157 45 23 14 7 3 2 366 32 851 1,368 475 237 128 66 47 61 3,232 13 214 1,886 980 874 824 509 359 308 5,955
Colorado - 6 11 7 4 1 - - - 28 - 600 1,128 438 204 103 50 26 18 2,569 292 111 967 715 549 339 193 139 169 3,183
Connecticut - 15 15 2 2 1 - - - 36 - 10 50 29 17 8 4 3 2 122 - 3 50 52 58 27 16 6 7 218
Delaware - 1 8 4 2 1 1 - - 18 2 23 57 13 3 2 - - - 98 - 22 47 12 5 1 - 1 1 89
District of Columbia - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Florida - 75 87 8 2 1 1 1 - 176 1 1,019 1,198 266 84 33 9 5 4 2,616 8 513 1,188 319 112 31 8 11 11 2,192
Georgia - - - - - - - - - - 134 805 1,079 264 95 45 15 7 8 2,319 1,433 1,460 2,101 557 216 93 26 15 22 4,490
Hawaii - - - - - - - - - - - 1 20 17 12 12 7 4 5 78 1 43 52 38 42 33 20 11 16 255
Idaho 53 22 26 6 2 1 1 - - 58 120 463 702 219 91 37 14 9 5 1,541 6 236 505 162 120 67 19 11 11 1,132
Illinois - 4 15 19 6 3 1 1 - 48 7 378 972 438 254 153 76 42 40 2,353 - 343 2,259 1,107 479 327 115 59 30 4,719
Indiana - 49 45 20 17 8 4 1 2 146 28 716 677 257 134 68 35 33 17 1,937 11 558 795 313 236 97 43 16 17 2,074
Iowa - - - - - - - - - - 31 914 1,128 553 346 194 103 68 80 3,387 3 - - - - - - - - -
Kansas - 163 191 33 12 4 1 1 - 404 - 1,533 794 163 67 37 17 8 7 2,627 36 1,071 2,213 587 196 82 38 21 21 4,230
Kentucky 1 243 117 20 8 5 2 1 1 397 5 515 486 122 48 23 9 4 5 1,214 23 241 1,025 573 272 106 49 23 22 2,311
Louisiana - 1 8 6 6 2 2 1 - 24 18 131 411 188 95 64 37 19 36 982 20 142 747 385 267 168 89 47 60 1,904
Maine - - 1 - - - - - - 1 - 223 291 102 57 35 22 19 45 794 5 190 303 144 100 72 42 29 61 941
Maryland - 40 23 4 1 1 - 1 1 69 - 135 132 26 11 7 3 3 3 320 10 170 326 118 43 22 10 6 12 707
Massachusetts - 4 5 1 - - - - - 10 - 17 46 21 11 5 2 1 2 105 1 48 116 46 30 28 13 7 17 305
Michigan - 196 102 25 9 4 5 2 1 343 - 856 816 234 117 57 21 12 15 2,130 48 1,211 2,327 696 273 156 75 53 55 4,846
Minnesota - 15 13 3 1 - - - - 34 1 1,250 1,136 479 284 155 72 40 37 3,454 16 1,826 1,740 1,099 719 403 317 182 151 6,437
Mississippi - - - - - - - - - - - 482 727 251 154 90 42 19 18 1,783 35 550 1,372 616 458 342 213 124 79 3,754
Missouri - 584 416 82 27 10 3 1 1 1,125 1 644 846 230 86 40 16 9 8 1,879 28 240 1,248 1,088 734 370 168 89 58 3,994
Montana - - - - - - - - - - - 636 1,318 425 190 93 44 23 45 2,773 8 396 1,362 530 273 144 73 34 39 2,851
Nebraska 19 66 126 59 30 15 9 4 3 313 211 938 708 216 116 67 31 20 31 2,128 21 2,013 1,114 279 193 118 59 64 79 3,918
Nevada - - - - - - - - - - - 990 414 76 27 7 3 2 1 1,519 1 152 356 136 46 20 5 4 2 721
New Hampshire - 9 1 - - - - - - 9 - 151 110 28 14 8 4 3 4 323 4 168 191 58 35 35 25 24 87 625
New Jersey - 8 19 5 2 1 - - - 35 - 38 43 20 19 17 8 5 8 160 3 43 99 52 29 29 15 8 7 282
New Mexico - - - - - - - - - - 3 681 701 253 130 72 37 19 22 1,915 10 268 505 393 291 257 176 121 282 2,294
New York 3 24 84 31 20 10 4 2 1 178 37 290 1,011 355 178 103 60 32 40 2,068 19 290 1,106 586 361 195 106 44 124 2,812
North Carolina - 226 147 25 9 7 2 1 2 419 15 340 778 254 100 42 20 10 13 1,558 17 130 1,278 461 344 193 113 45 72 2,636
North Dakota - - - - - - - - - - - 1,234 1,138 312 133 63 25 15 24 2,943 5 792 1,133 307 138 59 37 21 38 2,526
Ohio - 132 135 42 14 6 2 1 1 334 5 529 661 178 81 38 17 9 11 1,523 11 626 1,337 399 157 85 34 10 7 2,655
Oklahoma - - 1 - - - - - - 2 41 384 948 390 208 119 68 40 47 2,206 23 8 14 8 6 5 1 1 3 46
Oregon - - - - - - - - - - - 669 1,326 376 157 71 28 16 13 2,657 10 118 977 720 260 46 29 42 - 2,191
Pennsylvania - 112 159 38 15 9 7 5 6 350 - 303 715 243 119 60 32 19 24 1,517 19 326 1,402 1,239 657 362 195 99 171 4,449
Rhode Island - 4 2 2 2 1 - - - 11 1 4 12 13 18 16 13 8 13 96 - - - 2 3 6 7 3 4 23
South Carolina - 10 27 4 3 - - - - 45 - 203 701 308 167 85 40 21 19 1,546 18 344 1,238 752 333 192 66 36 23 2,985
South Dakota - 108 103 47 22 7 2 2 - 291 22 401 1,114 508 269 138 71 41 28 2,570 20 498 1,136 555 325 189 99 52 36 2,889
Tennessee - 9 5 - - - - - - 14 99 670 690 171 80 42 18 10 6 1,686 38 2 21 5 - - - 6 - 34
Texas 1 46 49 21 6 3 1 1 - 127 42 2,382 3,597 1,385 587 246 94 43 35 8,370 86 14 59 160 207 105 26 9 - 581
Utah - - 4 3 1 1 - - - 9 - 205 513 237 118 53 18 9 7 1,162 2 148 467 273 210 109 63 22 20 1,311
Vermont - - 1 1 - - - - - 2 1 99 135 37 20 14 8 7 9 329 5 99 330 133 74 46 18 17 15 731
Virginia - 19 58 11 2 1 - - - 92 1 257 829 315 137 56 23 11 5 1,633 13 171 1,670 1,097 396 163 43 17 6 3,563
Washington - 139 295 88 32 18 14 10 16 612 - 194 636 261 114 53 24 15 17 1,313 12 177 620 420 284 210 125 69 118 2,024
West Virginia - - - - - - - - - - 23 133 390 213 118 67 32 21 20 994 4 25 517 385 183 107 52 38 38 1,346
Wisconsin - 55 56 43 24 16 6 2 2 203 1 858 912 481 282 157 80 51 50 2,871 - 1,220 1,270 599 468 370 240 213 250 4,630
Wyoming - - - - - - - - - - 7 634 876 257 112 41 15 8 16 1,960 3 326 560 183 86 33 12 10 8 1,217
U.S. Total 82 2,519 2,534 724 319 160 82 41 42 6,421 1,252 26,554 36,481 12,770 6,292 3,255 1,559 919 1,077 88,908 2,475 18,964 44,029 20,655 11,898 7,154 3,809 2,375 2,708 111,592
Puerto Rico (4) - - - - - - - - - - 1 - 1 3 23 6 2 - 7 42 13 - - - - 18 30 38 132 218
Grand Total 82 2,519 2,534 724 319 160 82 41 42 6,421 1,253 26,554 36,482 12,773 6,315 3,261 1,561 919 1,084 88,950 2,488 18,964 44,029 20,655 11,898 7,172 3,839 2,413 2,840 111,810

August 30, 2019

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 1 260 76 31 24 18 11 6 6 432
Alaska - 28 28 12 5 3 1 - 1 79
Arizona 2 147 59 23 12 5 3 1 1 250
Arkansas - 117 103 39 22 13 7 5 4 310
California 14 262 431 214 153 90 47 31 28 1,256
Colorado - 67 118 51 37 16 8 4 3 304
Connecticut - 152 103 32 15 8 3 2 3 318
Delaware - 5 17 7 5 3 2 1 1 41
District of Columbia - - 1 - 4 - 2 - 4 12
Florida - 448 235 39 22 16 9 5 4 778
Georgia - 370 208 69 30 16 9 4 4 710
Hawaii - 1 12 12 9 10 5 3 3 55
Idaho - 51 29 6 4 2 1 - - 93
Illinois 1 322 389 90 57 37 22 13 12 940
Indiana 3 188 129 69 46 30 15 10 12 500
Iowa 13 61 64 20 9 5 2 2 2 165
Kansas 1 119 57 26 16 9 4 2 1 234
Kentucky 1 118 66 20 14 7 3 2 1 231
Louisiana 11 108 91 53 48 49 26 13 11 400
Maine - 53 20 7 3 3 - - - 87
Maryland - 137 124 29 15 10 6 6 11 338
Massachusetts - 317 112 31 18 13 8 4 6 508
Michigan 3 125 295 89 58 44 24 18 19 673
Minnesota - 79 143 49 23 15 8 4 5 325
Mississippi - 148 48 24 16 10 4 2 1 253
Missouri - 310 137 39 24 16 7 4 3 538
Montana - 41 42 6 4 2 1 - 1 98
Nebraska 2 19 26 10 6 3 1 1 1 67
Nevada 8 72 39 19 14 5 3 2 1 155
New Hampshire - 65 14 3 1 - - - - 83
New Jersey - 128 150 34 22 17 12 9 15 387
New Mexico - 105 29 9 6 4 1 1 1 156
New York 48 231 353 131 66 44 26 16 23 890
North Carolina 5 353 230 81 41 21 9 3 2 740
North Dakota - 18 28 8 4 2 1 - - 61
Ohio - 383 318 103 57 33 16 10 11 931
Oklahoma 1 86 112 38 17 14 8 5 5 285
Oregon - 102 89 19 10 7 4 2 1 234
Pennsylvania - 279 284 87 52 33 21 14 18 788
Rhode Island - 17 26 5 2 1 - - 1 52
South Carolina - 152 86 29 20 9 4 2 2 304
South Dakota - 14 51 12 5 3 1 - - 88
Tennessee - 366 112 40 19 9 6 2 3 557
Texas 5 410 549 224 135 80 34 15 7 1,453
Utah - 81 109 34 15 9 3 2 1 253
Vermont - 43 16 3 2 - - - - 64
Virginia - 154 235 69 28 19 8 4 2 521
Washington - 113 124 43 22 11 7 6 8 335
West Virginia - 118 64 21 13 9 5 2 3 235
Wisconsin 3 117 105 52 41 26 8 7 6 363
Wyoming - 38 29 17 11 5 2 2 2 106
U.S. Total 124 7,499 6,315 2,179 1,302 814 419 248 260 19,035
Puerto Rico (4) 2 - 30 74 47 44 28 7 6 236
Grand Total 126 7,499 6,345 2,253 1,349 858 447 255 266 19,271

August 30, 2019

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 1 11 9 4 2 1 1 - - 29 13 435 491 151 79 44 31 20 38 1,288
Alaska - - - - - - - - - - 1 14 39 28 18 15 7 7 11 139
Arizona 6 87 80 21 12 5 2 1 1 209 230 79 134 112 99 79 48 35 31 618
Arkansas 1 11 38 19 11 9 6 6 3 102 20 57 191 120 78 62 34 26 43 610
California 5 303 548 291 183 103 56 33 29 1,545 36 150 554 747 857 968 759 722 1,904 6,660
Colorado - 68 139 52 29 18 8 5 6 324 - 75 253 193 161 123 78 59 126 1,068
Connecticut - 79 110 29 13 9 2 1 1 244 - 17 150 147 121 92 60 43 82 712
Delaware 1 4 22 7 3 1 1 - - 38 1 18 89 41 20 14 9 6 16 213
District of Columbia - - 2 - 6 - 4 - 4 15 - - - - 9 - 24 - 73 107
Florida - 218 249 54 26 15 6 4 3 574 8 931 1,673 620 308 181 92 57 87 3,951
Georgia 6 57 64 19 15 10 4 1 2 171 77 580 981 326 170 99 57 38 62 2,313
Hawaii - - 7 7 6 5 2 2 4 34 - 19 40 45 37 41 24 18 44 269
Idaho 8 8 9 1 1 1 1 - - 21 152 56 86 40 24 22 11 9 13 259
Illinois 3 20 37 15 15 12 8 5 4 115 14 161 737 538 431 315 218 161 312 2,873
Indiana 21 44 38 28 15 9 6 3 3 146 623 273 350 176 123 85 55 39 52 1,152
Iowa - - - - - - - - - - 22 92 200 169 130 93 57 44 107 893
Kansas - 76 64 21 12 8 5 2 2 191 - 75 84 45 36 26 17 11 16 311
Kentucky 1 32 13 8 5 3 2 1 - 64 33 154 196 85 64 41 23 19 32 614
Louisiana - 8 11 7 12 11 9 7 7 72 105 81 206 142 122 107 80 75 156 968
Maine - 3 6 2 2 2 1 1 1 17 - 14 32 23 17 14 8 5 17 129
Maryland - 88 133 36 20 12 6 5 7 308 16 156 285 131 94 78 56 51 157 1,008
Massachusetts 1 156 104 24 12 9 5 4 8 322 28 46 257 270 275 278 196 170 457 1,947
Michigan 2 85 155 55 23 14 7 7 5 351 5 138 453 397 328 276 210 165 391 2,358
Minnesota - 56 93 35 17 9 5 3 3 221 2 151 223 96 56 34 17 13 26 615
Mississippi - 13 30 9 5 3 2 1 1 64 - 115 282 170 113 74 52 37 105 949
Missouri 3 184 173 60 29 23 10 6 6 491 1 128 281 130 100 72 48 39 71 868
Montana - - - - - - - - - - 4 27 58 42 31 24 17 16 40 254
Nebraska 15 15 43 19 8 8 6 4 13 115 79 12 41 29 27 28 24 20 65 247
Nevada - 23 9 11 6 3 1 - - 53 12 119 107 47 31 27 13 9 13 365
New Hampshire - 56 14 2 2 1 - - - 74 - 63 67 28 19 12 8 6 21 223
New Jersey - 140 179 56 25 20 12 7 14 453 - 141 356 216 197 184 151 136 418 1,799
New Mexico - 1 4 4 2 - - - - 12 29 91 152 101 90 71 45 34 88 672
New York 42 51 247 134 98 80 56 42 66 774 112 90 660 480 367 291 208 193 759 3,049
North Carolina 18 184 164 48 25 16 8 5 5 455 31 184 640 423 269 171 95 62 120 1,964
North Dakota - - - - - - - - - - 1 23 53 38 32 17 13 9 23 207
Ohio 1 173 235 78 38 24 13 9 9 580 12 205 562 379 308 251 177 138 415 2,435
Oklahoma 13 43 80 28 17 12 6 3 3 192 669 44 149 88 74 51 29 24 47 506
Oregon - 22 25 9 3 2 2 - - 63 2 97 254 162 117 81 51 33 58 853
Pennsylvania - 94 226 102 57 39 19 11 18 568 - 181 649 496 439 332 224 167 372 2,860
Rhode Island 2 19 25 14 9 4 3 2 3 79 18 5 19 26 43 49 41 37 104 324
South Carolina - 18 36 13 6 6 2 1 1 84 - 56 339 246 172 111 58 34 49 1,064
South Dakota - - 7 5 4 1 1 - - 18 8 6 33 22 20 17 13 10 8 129
Tennessee - 73 49 19 13 8 5 2 3 173 67 457 672 254 160 100 69 42 83 1,835
Texas 54 194 500 280 183 101 46 21 16 1,342 74 626 1,510 933 703 567 409 332 1,019 6,101
Utah - 18 19 7 3 1 - - - 49 11 115 249 116 69 41 21 13 22 648
Vermont - 2 10 3 1 1 - - - 16 3 12 41 24 14 11 6 4 11 124
Virginia 1 79 172 48 27 15 5 3 1 351 23 58 369 277 218 161 102 73 74 1,332
Washington - 113 187 50 28 15 8 7 15 421 21 52 255 230 200 162 117 97 309 1,422
West Virginia - - 3 3 2 2 1 2 1 14 3 32 148 81 51 32 17 15 20 396
Wisconsin - 69 91 70 52 36 13 5 7 342 22 82 277 296 316 274 205 148 328 1,927
Wyoming - 2 - - - - - - - 3 17 39 73 34 21 15 11 8 19 219
U.S. Total 204 2,999 4,456 1,811 1,083 685 366 220 276 11,896 2,608 6,829 16,002 10,012 7,858 6,310 4,395 3,528 8,912 63,846
Puerto Rico (4) 2 - - 3 9 12 11 7 8 50 13 - 4 26 53 65 74 55 111 388
Grand Total 206 2,999 4,456 1,814 1,092 697 377 227 284 11,946 2,621 6,829 16,006 10,038 7,911 6,375 4,469 3,583 9,023 64,234

(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.

(4) 2009 data.

Return to top

Page last modified on January 21, 2021
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