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FHWA Home / Policy & Governmental Affairs / Highway Policy Information / Table HM-47 - Highway Statistics 2018

Highway Statistics 2018


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NATIONAL HIGHWAY SYSTEM LENGTH - 2018
  MILES BY MEASURED PAVEMENT ROUGHNESS - RURAL

August 30, 2019
Table HM-47
Sheet 1 of 4

STATE INTERNATIONAL ROUGHNESS INDEX (IRI) (1)
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 3 409 104 22 16 9 3 2 2 567 3 968 793 131 50 27 12 8 11 1,999
Alaska - 204 330 152 113 86 49 30 38 1,002 323 83 148 69 67 68 53 49 128 664
Arizona 2 538 223 78 38 16 11 5 5 915 36 388 396 167 105 59 28 15 12 1,171
Arkansas - 235 139 33 15 9 3 3 3 439 0 356 850 338 194 105 48 26 20 1,938
California 9 520 369 144 76 33 16 8 11 1,177 19 951 1,527 521 263 141 68 39 51 3,562
Colorado - 135 288 117 39 25 23 15 6 648 - 604 1,133 441 203 102 49 26 17 2,576
Connecticut - 17 6 3 1 1 0 0 0 29 - 25 65 31 19 9 5 3 2 158
Delaware - - - - - - - - - - 2 27 70 18 6 2 1 1 0 125
Dist. of Columbia - - - - - - - - - - - - - - - - - - - -
Florida 0 601 97 7 6 3 2 1 1 717 1 1,090 1,264 269 83 33 9 5 4 2,758
Georgia - 215 224 57 23 9 6 2 2 537 - 970 1,443 409 146 58 22 10 12 3,070
Hawaii - - - - - - - - - - - 1 20 17 12 12 7 4 5 80
Idaho 1 309 152 32 16 7 3 1 2 522 151 468 711 219 91 39 15 10 5 1,557
Illinois - 741 365 76 31 17 6 4 4 1,243 7 382 986 457 260 156 77 43 41 2,402
Indiana 13 433 189 65 31 19 13 9 12 771 5 648 589 226 129 65 32 29 14 1,731
Iowa 26 288 205 57 22 7 3 2 2 585 30 914 1,128 553 347 194 103 68 80 3,388
Kansas - 391 179 44 16 6 2 1 0 639 - 1,696 985 196 79 41 19 9 7 3,031
Kentucky 2 504 137 32 19 10 4 1 2 709 5 760 607 147 58 29 12 5 6 1,624
Louisiana 7 193 134 87 65 29 11 4 2 526 19 144 469 214 113 76 45 24 41 1,124
Maine - 154 76 26 13 6 2 1 1 279 1 223 294 104 58 35 23 19 45 800
Maryland - 66 57 11 5 1 0 0 1 142 0 172 148 28 11 7 4 4 3 377
Massachusetts - 34 22 4 2 1 0 1 0 64 0 66 186 78 42 25 13 7 14 431
Michigan 4 182 238 67 34 20 9 6 3 558 0 1,053 921 262 128 62 26 14 16 2,483
Minnesota 0 192 295 50 29 11 5 3 3 588 1 1,265 1,149 483 286 155 73 41 37 3,488
Mississippi - 387 115 31 22 13 6 2 2 578 - 485 735 255 160 93 44 20 20 1,812
Missouri - 585 200 31 14 7 3 1 1 842 1 1,223 1,252 308 116 50 20 10 9 2,989
Montana - 573 397 68 29 14 5 3 4 1,094 - 636 1,318 425 190 93 44 23 45 2,773
Nebraska 3 213 145 25 15 9 3 1 1 412 230 1,010 829 281 152 83 40 25 34 2,453
Nevada 7 400 28 10 3 3 3 1 1 450 - 993 434 81 25 6 3 1 1 1,544
New Hampshire - 112 24 4 2 1 - - - 142 - 174 131 36 20 11 6 4 6 387
New Jersey - 17 23 3 1 0 0 1 - 45 - 46 62 24 22 18 8 6 8 195
New Mexico - 561 176 55 27 14 5 2 3 843 - 661 647 212 107 57 29 16 20 1,750
New York 11 316 305 85 44 19 8 6 8 793 41 315 1,097 387 199 113 64 34 41 2,250
North Carolina 1 386 123 23 15 7 4 2 0 560 7 613 1,045 319 122 55 24 13 16 2,207
North Dakota - 253 204 37 10 3 1 1 0 510 - 1,234 1,138 312 133 63 25 15 24 2,944
Ohio - 346 196 56 23 12 5 2 3 643 - 648 803 224 99 46 19 10 12 1,861
Oklahoma 1 286 261 49 24 13 6 5 3 645 92 384 952 393 209 120 69 40 47 2,215
Oregon - 280 158 37 13 4 1 1 1 495 - 669 1,323 377 158 72 28 16 13 2,657
Pennsylvania - 519 365 89 56 20 9 8 9 1,074 - 412 872 282 133 70 39 23 31 1,862
Rhode Island - 15 2 0 0 0 0 0 0 18 1 8 13 15 20 17 13 8 13 107
South Carolina - 360 132 30 14 6 2 1 1 546 - 213 728 312 171 85 41 21 19 1,590
South Dakota - 219 313 36 13 6 3 1 - 591 22 509 1,219 559 292 145 73 43 29 2,869
Tennessee 0 519 92 14 10 5 2 2 0 644 37 680 698 173 82 43 18 10 6 1,710
Texas 1 894 821 181 62 27 8 4 3 2,000 42 2,266 3,227 1,231 529 224 83 37 31 7,626
Utah - 378 236 52 11 5 2 1 1 684 5 206 518 243 121 54 19 9 7 1,178
Vermont 1 176 60 11 6 2 1 0 0 255 1 92 126 35 17 12 8 6 9 306
Virginia - 272 268 40 11 6 1 0 0 598 9 276 895 334 143 59 24 11 5 1,747
Washington - 170 145 41 28 18 10 8 9 429 - 333 928 351 147 71 38 25 32 1,925
West Virginia 0 159 111 24 12 6 4 1 2 319 23 133 391 214 118 67 32 21 20 994
Wisconsin - 247 136 46 42 23 8 6 4 512 2 946 981 534 313 180 90 56 58 3,158
Wyoming - 483 211 62 28 14 5 2 3 807 6 634 876 257 112 41 15 8 16 1,960
U.S. Total 92 15,486 9,074 2,302 1,143 585 279 160 158 29,188 1,122 29,050 39,120 13,551 6,659 3,449 1,659 969 1,147 95,605
Puerto Rico 0 1 7 6 3 4 4 5 14 44 0 0 4 5 4 6 5 6 12 43
Grand Total 92 15,486 9,081 2,308 1,147 589 283 165 172 29,232 1,122 29,050 39,124 13,556 6,664 3,456 1,664 975 1,159 95,647

NATIONAL HIGHWAY SYSTEM LENGTH - 2018
  MILES BY MEASURED PAVEMENT ROUGHNESS - RURAL

August 30, 2019
Table HM-47
Sheet 2 of 4

STATE INTERNATIONAL ROUGHNESS INDEX (IRI) (1)
TOTAL RURAL NHS
NOT REPORTED (2) < 60 60-94 95-119 120-144 145-170 171-194 195-220 > 220 TOTAL REPORTED
Alabama 6 1,377 896 153 66 35 16 10 12 2,566
Alaska 323 287 478 221 179 154 102 79 166 1,666
Arizona 38 926 619 245 143 75 39 20 17 2,086
Arkansas 0 591 989 371 209 114 51 29 23 2,377
California 28 1,471 1,897 664 339 175 84 47 62 4,739
Colorado - 739 1,422 558 242 127 72 41 23 3,224
Connecticut - 42 71 34 21 10 5 3 2 186
Delaware 2 27 70 18 6 2 1 1 0 125
Dist. of Columbia - - - - - - - - - -
Florida 1 1,691 1,361 275 89 35 11 6 6 3,475
Georgia - 1,184 1,666 466 169 67 27 12 14 3,608
Hawaii - 1 20 17 12 12 7 4 5 80
Idaho 152 777 863 251 107 46 17 11 7 2,079
Illinois 7 1,122 1,351 533 291 173 83 46 44 3,645
Indiana 18 1,081 779 291 160 84 44 38 26 2,502
Iowa 57 1,202 1,333 610 369 201 105 70 82 3,973
Kansas - 2,087 1,164 239 95 47 21 10 8 3,671
Kentucky 8 1,263 744 180 76 39 15 7 8 2,333
Louisiana 26 337 603 301 178 105 56 28 43 1,650
Maine 1 378 370 130 72 41 24 20 46 1,080
Maryland 0 238 204 39 16 9 4 4 4 519
Massachusetts 0 100 208 83 44 26 14 7 14 495
Michigan 4 1,235 1,159 328 162 82 36 20 20 3,041
Minnesota 1 1,457 1,444 533 315 166 77 44 40 4,076
Mississippi - 872 850 286 181 107 50 23 22 2,391
Missouri 1 1,807 1,452 338 130 57 24 11 10 3,830
Montana - 1,209 1,715 492 219 107 49 26 49 3,867
Nebraska 233 1,222 974 307 167 92 43 25 35 2,865
Nevada 7 1,393 462 91 28 10 7 2 1 1,994
New Hampshire - 286 155 40 21 11 6 4 6 529
New Jersey - 63 85 28 23 19 9 6 8 240
New Mexico - 1,222 823 267 134 71 34 19 22 2,593
New York 52 631 1,402 472 244 133 72 40 49 3,043
North Carolina 7 999 1,168 342 137 63 28 14 16 2,767
North Dakota - 1,486 1,342 349 143 66 26 16 25 3,453
Ohio - 994 999 280 122 58 24 12 15 2,504
Oklahoma 94 670 1,213 441 233 133 75 45 50 2,860
Oregon - 949 1,481 414 171 77 30 17 14 3,152
Pennsylvania - 931 1,237 372 188 90 48 31 39 2,937
Rhode Island 1 23 15 16 20 17 13 8 13 125
South Carolina - 573 861 342 184 91 43 22 20 2,137
South Dakota 22 727 1,532 595 306 151 76 44 29 3,460
Tennessee 37 1,199 790 187 92 48 20 12 6 2,354
Texas 43 3,160 4,047 1,411 591 251 92 40 33 9,626
Utah 5 584 754 295 132 59 20 10 8 1,861
Vermont 1 267 186 46 23 14 8 7 9 562
Virginia 9 548 1,163 373 155 65 25 11 6 2,345
Washington - 503 1,073 392 175 89 48 33 41 2,354
West Virginia 23 292 501 237 130 73 36 22 22 1,313
Wisconsin 2 1,193 1,117 580 355 203 98 61 63 3,670
Wyoming 6 1,117 1,087 319 139 55 21 10 19 2,768
U.S. Total 1,214 44,535 48,194 15,853 7,803 4,034 1,939 1,129 1,306 124,793
Puerto Rico 0 1 11 11 7 11 9 11 26 86
Grand Total 1,214 44,536 48,205 15,864 7,810 4,045 1,947 1,140 1,332 124,880

NATIONAL HIGHWAY SYSTEM LENGTH - 2018
  MILES BY MEASURED PAVEMENT ROUGHNESS - URBAN

August 30, 2019
Table HM-47
Sheet 3 of 4

STATE INTERNATIONAL ROUGHNESS INDEX (IRI) (1)
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 1 260 76 31 24 18 11 6 6 432 9 435 477 149 77 46 31 20 36 1,272
Alaska - 28 28 12 5 3 1 0 1 79 1 19 45 30 20 16 8 8 14 160
Arizona 2 147 59 23 12 5 3 1 1 250 44 162 197 121 103 78 48 35 31 774
Arkansas - 117 103 39 22 13 7 5 4 310 2 65 223 127 84 67 39 30 41 677
California 14 262 431 214 153 90 47 31 28 1,256 31 448 1,097 1,019 1,033 1,053 816 740 1,896 8,103
Colorado - 67 118 51 37 16 8 4 3 304 0 139 390 243 188 139 85 63 134 1,380
Connecticut - 152 103 32 15 8 3 2 3 318 - 96 259 176 134 101 62 44 85 958
Delaware - 5 17 7 5 3 2 1 1 41 1 24 113 49 23 15 10 5 15 255
Dist. of Columbia 0 - 1 - 4 - 2 - 4 12 - - 2 - 15 0 28 0 77 122
Florida - 448 235 39 22 16 9 5 4 778 3 1,131 1,902 673 341 201 103 66 106 4,522
Georgia - 370 208 69 30 16 9 4 4 710 6 675 1,145 398 216 128 73 48 90 2,772
Hawaii - 1 12 12 9 10 5 3 3 55 - 20 47 54 45 49 28 21 52 318
Idaho 0 51 29 6 4 2 1 0 0 93 93 57 90 39 24 21 11 9 13 264
Illinois 1 322 389 90 57 37 22 13 12 940 24 183 779 565 462 342 240 181 381 3,134
Indiana 3 188 129 69 46 30 15 10 12 500 37 205 188 105 71 44 26 19 23 681
Iowa 13 61 64 20 9 5 2 2 2 165 17 93 203 173 133 95 58 46 113 915
Kansas 1 119 57 26 16 9 4 2 1 234 0 151 149 67 49 35 22 13 21 507
Kentucky 1 118 66 20 14 7 3 2 1 231 44 186 212 94 69 44 25 19 32 683
Louisiana 11 108 91 53 48 49 26 13 11 400 102 96 228 156 136 117 86 77 152 1,048
Maine - 53 20 7 3 3 0 0 0 87 0 16 39 28 22 18 11 6 20 160
Maryland 0 137 124 29 15 10 6 6 11 338 17 232 401 164 111 90 63 58 176 1,295
Massachusetts 0 317 112 31 18 13 8 4 6 508 31 202 362 296 289 290 204 176 473 2,292
Michigan 3 125 295 89 58 44 24 18 19 673 10 223 609 455 354 292 218 173 402 2,726
Minnesota 0 79 143 49 23 15 8 4 5 325 2 207 319 132 73 44 23 16 33 848
Mississippi - 148 48 24 16 10 4 2 1 253 - 129 311 176 117 77 54 38 107 1,009
Missouri - 310 137 39 24 16 7 4 3 538 1 311 448 186 125 94 56 44 76 1,340
Montana - 41 42 6 4 2 1 0 1 98 4 27 56 38 24 19 14 11 28 217
Nebraska 2 19 26 10 6 3 1 1 1 67 98 27 85 49 37 37 30 25 81 370
Nevada 8 72 39 19 14 5 3 2 1 155 2 131 119 59 38 31 15 9 14 416
New Hampshire - 65 14 3 1 0 0 - - 83 0 122 85 33 22 14 11 7 25 320
New Jersey - 128 150 34 22 17 12 9 15 387 - 283 543 278 226 209 170 152 480 2,341
New Mexico - 105 29 9 6 4 1 1 1 156 - 81 101 60 44 28 17 12 35 379
New York 48 231 353 131 66 44 26 16 23 890 152 142 916 623 473 382 271 242 850 3,898
North Carolina 5 353 230 81 41 21 9 3 2 740 38 345 718 408 250 157 88 58 102 2,125
North Dakota - 18 28 8 4 2 1 0 0 61 1 23 53 38 31 16 13 9 23 205
Ohio - 383 318 103 57 33 16 10 11 931 - 323 624 335 245 191 128 102 274 2,222
Oklahoma 1 86 112 38 17 14 8 5 5 285 34 86 223 112 87 59 32 24 39 660
Oregon - 102 89 19 10 7 4 2 1 234 3 119 282 168 117 78 55 37 67 924
Pennsylvania - 279 284 87 52 33 21 14 18 788 - 274 871 599 498 372 245 179 396 3,433
Rhode Island - 17 26 5 2 1 0 0 1 52 20 24 44 41 52 53 43 39 107 404
South Carolina - 152 86 29 20 9 4 2 2 304 - 75 378 262 180 119 61 35 52 1,161
South Dakota - 14 51 12 5 3 1 0 0 88 8 6 39 27 24 18 13 11 8 147
Tennessee 0 366 112 40 19 9 6 2 3 557 6 532 731 279 179 114 77 49 99 2,060
Texas 5 410 549 224 135 80 34 15 7 1,453 125 764 1,857 1,116 810 615 413 318 946 6,840
Utah - 81 109 34 15 9 3 2 1 253 16 132 266 121 69 39 19 12 20 678
Vermont - 43 16 3 2 0 0 0 0 64 2 11 32 13 8 6 3 3 9 87
Virginia 0 154 235 69 28 19 8 4 2 521 27 136 536 331 248 182 111 79 81 1,703
Washington - 113 124 43 22 11 7 6 8 335 - 165 442 282 231 180 128 107 337 1,871
West Virginia 0 118 64 21 13 9 5 2 3 235 3 32 151 83 53 34 18 17 22 411
Wisconsin 3 117 105 52 41 26 8 7 6 363 9 136 322 308 294 259 170 126 313 1,928
Wyoming - 38 29 17 11 5 2 2 2 106 1 34 59 29 18 13 9 7 16 185
U.S. Total 124 7,499 6,315 2,179 1,302 814 419 248 260 19,035 1,025 9,533 19,765 11,370 8,576 6,718 4,584 3,628 9,023 73,197
Puerto Rico 14 2 47 39 35 30 19 19 52 243 10 1 16 26 46 56 52 50 178 425
Grand Total 139 7,501 6,362 2,218 1,337 845 437 267 311 19,278 1,034 9,534 19,781 11,396 8,622 6,775 4,636 3,678 9,201 73,622

NATIONAL HIGHWAY SYSTEM LENGTH - 2018
  MILES BY MEASURED PAVEMENT ROUGHNESS - URBAN

August 30, 2019
Table HM-47
Sheet 4 of 4

STATE INTERNATIONAL ROUGHNESS INDEX (IRI) (1)
TOTAL URBAN NHS
NOT REPORTED (2) < 60 60-94 95-119 120-144 145-170 171-194 195-220 > 220 TOTAL REPORTED
Alabama 10 696 553 180 101 64 42 26 42 1,704
Alaska 1 47 73 42 25 19 9 8 15 239
Arizona 46 309 255 145 114 83 50 36 32 1,025
Arkansas 2 183 326 166 106 81 46 35 46 988
California 45 710 1,528 1,233 1,186 1,143 864 771 1,924 9,359
Colorado 0 206 508 294 225 155 93 67 137 1,684
Connecticut - 248 363 208 149 109 65 46 87 1,275
Delaware 1 28 130 56 28 18 13 6 17 296
Dist. of Columbia 0 - 3 - 19 0 30 0 81 134
Florida 3 1,579 2,136 712 363 217 112 70 110 5,300
Georgia 6 1,045 1,353 467 246 143 82 52 93 3,482
Hawaii - 20 60 66 54 59 33 24 55 373
Idaho 93 108 119 45 28 22 12 9 13 357
Illinois 25 505 1,168 655 519 379 262 194 393 4,074
Indiana 40 393 317 174 117 74 42 29 35 1,180
Iowa 30 154 267 193 142 100 61 48 115 1,080
Kansas 1 270 206 93 64 43 26 15 22 740
Kentucky 45 304 278 114 84 51 29 21 34 914
Louisiana 113 204 319 209 184 166 112 91 163 1,448
Maine 0 69 60 35 25 21 11 6 20 247
Maryland 18 369 525 193 126 100 69 64 188 1,633
Massachusetts 31 519 474 326 307 302 212 180 479 2,799
Michigan 13 348 904 544 412 336 242 191 421 3,399
Minnesota 2 286 461 181 97 59 32 21 38 1,174
Mississippi - 276 359 200 133 87 58 40 108 1,262
Missouri 1 620 585 225 149 109 63 48 79 1,878
Montana 4 68 98 44 28 21 15 12 28 315
Nebraska 100 46 111 60 43 39 32 25 82 437
Nevada 10 203 158 78 52 36 17 11 15 571
New Hampshire 0 187 99 36 23 14 11 7 25 403
New Jersey - 411 693 312 248 226 182 161 495 2,728
New Mexico - 186 129 69 50 32 19 13 37 535
New York 200 372 1,269 754 539 426 297 258 873 4,789
North Carolina 43 698 948 489 292 178 96 61 104 2,865
North Dakota 1 41 81 46 35 18 13 9 23 266
Ohio - 707 942 438 301 224 144 113 285 3,153
Oklahoma 35 171 335 150 104 73 40 29 44 946
Oregon 3 222 370 187 128 85 59 40 68 1,158
Pennsylvania - 553 1,155 686 549 405 266 192 414 4,221
Rhode Island 20 41 70 46 55 54 44 39 108 456
South Carolina - 227 464 291 200 127 65 37 53 1,465
South Dakota 8 20 91 39 30 21 15 11 8 235
Tennessee 6 898 843 319 198 123 83 51 102 2,617
Texas 131 1,174 2,406 1,340 946 695 447 332 954 8,293
Utah 16 213 375 154 84 48 22 14 21 931
Vermont 2 54 48 16 10 7 3 4 9 151
Virginia 28 290 771 399 276 201 120 83 83 2,224
Washington - 278 566 325 253 191 134 113 345 2,206
West Virginia 3 150 215 104 67 43 23 19 25 646
Wisconsin 13 253 427 360 335 286 178 133 318 2,290
Wyoming 1 72 88 47 29 18 11 9 18 291
U.S. Total 1,149 17,032 26,080 13,549 9,878 7,533 5,002 3,876 9,283 92,233
Puerto Rico 24 3 63 65 80 87 71 69 230 668
Grand Total 1,173 17,035 26,143 13,614 9,958 7,620 5,073 3,944 9,513 92,900

(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.

 

Page last modified on December 23, 2019
Federal Highway Administration | 1200 New Jersey Avenue, SE | Washington, DC 20590 | 202-366-4000