Editing Interstate Highway System (section)

===Alaska, Hawaii, and Puerto Rico===
[[File:Puerto Rico Interstates.svg|thumb|Map of routes in [[Puerto Rico]] that receive funding from the Interstate program, but are not signed as Interstate Highways]]
[[File:Interstate Alaska map.png|thumb|Map of routes in Alaska that receive funding from the Interstate program, but are not signed as Interstate Highways]]

The Interstate Highway System also extends to [[Alaska]], [[Hawaii]], and [[Puerto Rico]], even though they have no direct land connections to any other states or territories. However, their residents still pay federal fuel and tire taxes.

The Interstates in Hawaii, all located on the most populous island of [[Oahu]], carry the prefix '''H'''. There are three one-digit routes in the state ([[Interstate H-1|H-1]], [[Interstate H-2|H-2]], and [[Interstate H-3|H-3]]) and one auxiliary route ([[Interstate H-201|H-201]]). These Interstates connect several [[United States Air Force|military]] and [[United States Navy|naval]] bases together, as well as the important communities spread across Oahu, and especially within the urban core of [[Honolulu]].

Both Alaska and Puerto Rico also have public highways that receive 90&nbsp;percent of their funding from the Interstate Highway program. The [[Interstate Highways in Alaska|Interstates of Alaska]] and [[Interstate Highways in Puerto Rico|Puerto Rico]] are numbered sequentially in order of funding without regard to the rules on odd and even numbers. They also carry the prefixes '''A''' and '''PR''', respectively. However, these highways are signed according to their local designations, not their Interstate Highway numbers. Furthermore, these routes were neither planned according to nor constructed to the official [[Interstate Highway standards]].<ref name="FHWA2" />