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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 things as at-grade crossings, traffic lights, undivided or narrow freeways, or movable bridges (lift bridges and drawbridges). This article deals with present day gaps, as such examples were far more numerous during construction of the Interstate Highway System and the upgrading of existing roads to meet these standards, which did not occur everywhere at the same time. Temporary gaps, such as lane closures that reduce traffic to one lane and reduce speed limits, are also excluded. ==True gaps== True gaps are where two disjoint sections of road have the same Interstate highway number and can reasonably be considered part of "one highway" in theory, based on the directness of connections via other highways, or based on future plans to fill in the gap in the Interstate, or simply based on the shortness of the gap. The two sections are either not physically connected at all, or they are connected but the connection is not signed as part of the highway. It should be noted that most of these gaps (except for the one on I-95) exist because the two segments are actually two unrelated highways that were built at different times, but assigned the same number; many times, the same number was assigned to the second segment with the intention of eventually connecting it to the first segment. * Interstate 49 currently has five sections: one from Lafayette to Shreveport, Louisiana; the second one from Louisiana Highway 1 near Shreveport to Texarkana; the third section from I-40 near Alma, to US 71 south of Bella Vista, replacing most of I-540 and Arkansas Highway 549; and the last section from Pineville, to Kansas City, Missouri. A short, isolated section of I-49 exists in Bella Vista, Arkansas as Arkansas Highway 549. These gaps are expected to be eventually closed. * Interstate 69 has five sections: the original alignment travels from Indianapolis, Indiana, to Port Huron, Michigan. On October 2, 2006, a segment of I-69 opened in Tunica and DeSoto counties in Mississippi; this segment continues to Memphis, Tennessee in the north. Another section exists from near Evansville, Indiana to Scotland, Indiana, and is under construction to Martinsville, Indiana; this section is expected to be connected to the original I-69 in Indianapolis in the next decade. Also in late 2011, the section of the Wendell H. Ford Western Kentucky Parkway between I-24 and Exit 38/Pennyrile Parkway became signed as I-69. In 2012, a portion of US 59 between Houston and Cleveland, Texas became part of I-69. On February 28, 2013, a portion of US 59 between Houston and Rosenberg, Texas became part of I-69. This gap was bridged by the signing of the portion between the two segments of US 59 as I-69 in March 2015.〔http://ftp.dot.state.tx.us/pub/txdot/commission/2015/0326/5.pdf〕 * Interstate 73 has two sections: a section of the Greensboro Urban Loop in Greensboro, North Carolina, the only section of I-73 signed with normal Interstate shields, and one concurrent with the entire section of I-74 from Ulah to Ellerbe, North Carolina. On the other segments (where I-73 is cosigned with Interstate 74 and U.S. Route 220) the exact signage varies. However, immediately south of Greensboro, I-73 is signed FUTURE. Further south along the freeway, the Interstate is signed INTERSTATE. * Interstate 74 currently has five sections, one heading west from Cincinnati, Ohio, to Davenport, Iowa; one from the Virginia/North Carolina line along Interstate 77 south/east to a point southeast of Mount Airy, North Carolina; one traveling concurrent with US 311 around High Point connecting with I-85; one concurrent with the entire section of I-73 from Ulah to Ellerbe, North Carolina; and from west of Laurinburg to south of Lumberton, North Carolina, at Interstate 95. Other sections up to freeway standards are signed with I-74 shields that have FUTURE instead of INTERSTATE. Future I-73 shields are also placed along some of these sections. North Carolina is currently working on connecting all its sections of I-74, though the gap to Cincinnati will remain for the foreseen future. * The eastern Interstate 86 currently has two sections. One travels for from I-90 in North East, Pennsylvania, (which is a town in Northwestern PA) to exit 56 in Elmira, New York. The second section is a stretch outside of Binghamton traveling from I-81 in Kirkwood to exit 79 in Windsor. The gap is currently signed as Future 86. I-86 will eventually travel from North East, Pennsylvania, to the New York State Thruway (I-87) near Harriman, New York. All the designated sections and gaps in New York are part of New York State Route 17. * Interstate 95. Probably the best-known and most notoriously confusing of all the Interstate gaps, I-95 is discontinuous in Lawrence Township, New Jersey (near Trenton). Coming north from Philadelphia, Pennsylvania, I-95 loops around the north side of Trenton and ends at U.S. Route 1, where it becomes I-295, which heads back south, heading to southern New Jersey. The other section of I-95 begins on the Pennsylvania Turnpike at the Pennsylvania/New Jersey state line, heads east into New Jersey along a spur of the New Jersey Turnpike, then heads north along the New Jersey Turnpike mainline, though it is only signed as far down the NJ Turnpike as I-195. Originally I-95 was planned to have left the alignment north of Trenton and headed northeast to Interstate 287 and travel east along I-287 to Exit 10 on the Turnpike, but the Somerset Freeway was never built. Extensions over the years have taken I-95 several miles further north to the US-1 interchange northeast of Trenton, and along the New Jersey Turnpike to the Pennsylvania state line. An interchange is under construction, connecting the southern alignment with the Pennsylvania Turnpike, and I-95 will be rerouted via it, with the part north of that interchange becoming an extension of I-295. * Interstate 99 currently has two sections: one from the Pennsylvania Turnpike north to just south of Interstate 80, concurrent with U.S. Route 220, and one from the Pennsylvania–New York state line north to the eastern Interstate 86 in Corning, New York, concurrent with U.S. Route 15. Much of the intervening route, including the entire US 15 section between Interstate 180 in Williamsport and the New York state line, has been constructed to freeway standards but as yet is not signed as part of I-99. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「List of gaps in Interstate Highways」の詳細全文を読む スポンサード リンク
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