Eisenhower Interstate System

Created in 1956 by President Dwight D. Eisenhower. Consists of highways in every state with a total of about 45,000 miles of road.

Interstate highways follow certain interstate naming rules.

The full name is the National System of Interstate and Defense Highways, which was a concept of roads as an issue of national security. In 1955, the Eisenhower administration stated "In case of atomic attack on our key cities, the road net must permit quick evacuation of target areas, mobilization of defense forces and maintenance of every essential economic function."

The Interstate System was inspired by Eisenhower's time as commander of the ETO and his experience with the German autobahn system which was also designed and implemented in order to move military forces and supplies quickly and efficiently under fire.

In reference to The_Custodian's writeup, the Eisenhower Interstate System was specifically inspired by the reichsautobahn; the highway system of Nazi Germany.

As such, the United States can add its interstate highway system to the list of American innovations and technologies derived from Nazi sources.

Here is a listing of the 1- and 2-digit US interstates, along with their associated 3-digit interstates. Note that 3-digit interstate numbers are only unique within states, so multiple highways with the same 3-digit interstate designation are quite common. For example, there are seven distinct 295's. 2-digit interstate numbers are unique nationwide, with the exceptions of 76, 84, 86, and 88.

Interstate 4 
Interstate 5:  105 205 305 405 505 605 705 805 905
Interstate 8
Interstate 10: 110 210 310 410 510 610 710 910*
Interstate 12
Interstate 15: 115 215 315 515
Interstate 16: 516
Interstate 17
Interstate 19
Interstate 20: 220 520 820
Interstate 24: 124
Interstate 25: 225
Interstate 26: 126 526
Interstate 27
Interstate 29: 129 229
Interstate 30: 130* 430 530 630
Interstate 35: 135 235 335 435 535 635
Interstate 37
Interstate 39
Interstate 40: 140 240 440 540 640 840
Interstate 43
Interstate 44: 244 444
Interstate 45: 345
Interstate 49
Interstate 55: 155* 255 355 555
Interstate 57
Interstate 59: 359 459 759
Interstate 64: 164 264 464 564 664
Interstate 65: 165 265 465 565
Interstate 66
Interstate 68
Interstate 69: 469
Interstate 70: 170 270 370 470 670
Interstate 71: 271 471
Interstate 72: 172
Interstate 73
Interstate 74: 474
Interstate 75: 175 275 375 475 575 675
Interstate 76: 176 276 376 476 676
Interstate 77: 277
Interstate 78: 278 678
Interstate 79: 279 579
Interstate 80: 180 280 380 480 580 680 780 880 980 238
Interstate 81: 181 381 481 581
Interstate 82: 182
Interstate 83: 283
Interstate 84: 184 384 684
Interstate 85: 185 285 385 485 585 785* 985
Interstate 86 
Interstate 87: 287 587 787
Interstate 88
Interstate 89: 189
Interstate 90: 190 290 390 490 590 690 790 890 990
Interstate 91: 291 391 691
Interstate 93: 293 393
Interstate 94: 194 294 394 494 694 794 894
Interstate 95: 195 295 395 495 595 695 795 895
Interstate 96: 196 496 696
Interstate 97
Interstate 99
Interstate H-1: I-H-201
Interstate H-2
Interstate H-3


* Indicates this is a future interstate number

Longest interstate (2-digit): I-90 – 3,085.27 mi
Shortest interstate (2-digit): I-97 – 17.57 mi
Longest interstate (3-digit): I-476 – 129.61 mi
Shortest interstate (3-digit): I-395 (Maryland) – 0.72 mi

For details about the interstate numbering system, see interstate and interstate naming rules.

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I've referenced a number of varying sources, so please /msg me about any oversights or updates. Thank you.