Dwight D. Eisenhower National System of Interstate and Defense Highways
Highway shields for Interstate 69 and Interstate 70, highways with true gaps and freeway gaps
Interstate Highways in the 48 contiguous states
System information
Formed
June 29, 1956[1]
Highway names
Interstates
Interstate X (I-X)
System links
Interstate Highway System
Main
Auxiliary
Suffixed
Business
Future
I-70 briefly follows an at-grade portion of US 30 with traffic lights in Breezewood, Pennsylvania
There are gaps in the Interstate Highway system, where the roadway carrying an Interstate shield does not conform to the standards set by the Federal Highway Administration (FHWA), the body that sets the regulations for the Interstate Highway System. For the most part, the Interstate Highway System in the United States is a connected system, with most freeways completed; however, some Interstates still have gaps. These gaps can be due to unconnected segments of the same route or from failure of the road to fully conform to Interstate standards by including such characteristics as at-grade crossings, traffic lights, undivided or narrow freeways, or movable bridges (lift bridges and drawbridges).
^Weingroff, Richard F. (Summer 1996). "Federal-Aid Highway Act of 1956, Creating the Interstate System". Public Roads. 60 (1). Washington, DC: Federal Highway Administration. Retrieved March 16, 2012.
and 29 Related for: List of gaps in Interstate Highways information
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