Alaska Routes are both numbered and named. There have been only twelve state highway numbers issued (1 through 11 and 98), and the numbering often has no obvious pattern. For example, Alaska Route 4 (AK-4) runs north and south, whereas AK-2 runs largely east and west, but runs north and south passing through and to the north of Fairbanks. The Klondike Highway, built in 1978, was unnumbered until 1998, when it was given its designation during the centennial of the Klondike Gold Rush. However, many Alaskan highways of greater length than the Klondike Highway remain unnumbered.