Wikivoyage talk:Routes Expedition/List of US Interstates

The United States is covered with a convenient system of Interstate highways. Interstates are always freeways (limited access; no grade crossings), while U.S. Highways may be freeways on some sections and not on others. These roads network between major (and minor) population centers, and can make it easy to cover long distances – or get to the other side of a large city – quickly. Primary Interstates have one- or two-digit numbers, with odd ones running north-south (e.g. I-5) and even ones running east-west (e.g. I-80). Secondary Interstates have three digit numbers, with ones beginning with an even number (ie. 275) forming a circle or semi-circle around a city and ones beginning with an odd number forming spurs into a city (ie.175).

'''This is a list of primary interstates of the US Interstate Highway System. '''
 * Interstate 4
 * Interstate 5
 * Interstate 8
 * Interstate 10
 * Interstate 12
 * Interstate 15
 * Interstate 16
 * Interstate 17
 * Interstate 19
 * Interstate 20
 * Interstate 24
 * Interstate 25
 * Interstate 26
 * Interstate 27
 * Interstate 29
 * Interstate 30
 * Interstate 35
 * Interstate 37
 * Interstate 39
 * Interstate 40
 * Interstate 43
 * Interstate 44
 * Interstate 45
 * Interstate 49
 * Interstate 55
 * Interstate 57
 * Interstate 59
 * Interstate 64
 * Interstate 65
 * Interstate 69
 * Interstate 70
 * Interstate 71
 * Interstate 72
 * Interstate 73
 * Interstate 74 (West)
 * Interstate 75
 * Interstate 76 (West)
 * Interstate 77
 * Interstate 78
 * Interstate 79
 * Interstate 80
 * Interstate 81
 * Interstate 82
 * Interstate 83
 * Interstate 84 (West)
 * Interstate 84 (East)
 * Interstate 85
 * Interstate 86 (West)
 * Interstate 86 (East)
 * Interstate 87
 * Interstate 88 (West)
 * Interstate 88 (East)
 * Interstate 89
 * Interstate 90
 * Interstate 91
 * Interstate 93
 * Interstate 94
 * Interstate 95
 * Interstate 96
 * Interstate 97
 * Interstate 99