Connection Gaps
Auxiliary Interstates (also known as three-digit Interstates) are intended to connect to their parent either directly or via a same-parented Interstate (like I-280 in California being connected to I-80 via I-680). Often, these connection gaps occur to eliminate concurrencies between other three-digit routes.
- Interstate 210 in California does not connect directly to Interstate 10, although I-210 is continuous with California State Route 210, which does connect to I-10, and California is petitioning to have that portion signed as Interstate 210 also. When that happens, this gap will disappear. I-210 does not connect to any of the spurs of I-10, with the exception of a short, unsigned, unfinished section of Interstate 710 which connects to Interstate 110 and State Route 110 only via surface streets.
- None of the spurs of I-78 (I-278, I-478, I-678, I-878) connect to its parent. I-78 was planned to extend through New York City and end as two branches, where I-295 and I-695 now end at I-95. I-478 comes the closest, and would have intersected if the Westway project were not canceled; I-278, the only I-78 spur to leave New York City, was planned to extend northwest to I-78 at Route 24. Since all the spurs are interconnected, only one of them needs to be eventually connected to its parent route for all of them to conform to standards.
- Freeway gaps (signed or unsigned) that officially connect auxiliary routes to the parent are excluded.
- I-585 used to connect with I-85 in Spartanburg, South Carolina, but I-85 was moved to a new bypassing route, and now I-585 ends at the I-85 Business loop. The signed connection to I-85 is via a surface section of US 176.
Instances of triple-digit designations that cross state lines when they connect to the Interstate in the neighboring state but do not reconnect in that state are excluded from this list. But there are even instances of triple-digit interstates that cross state borders into states where their parent does not even exist. However, Interstate 238 in the San Francisco area is an example of a triple-digit Interstate whose parent doesn't exist at all, on a side note: Every I-x80 designation in the San Francisco area was taken at the time I-238 was commissioned, in which an instance of a California state route with an x80 designation eliminated a candidate for a 3-digit Interstate designation, as California law prohibits state highways from having common numbers with co-existing US and Interstate highways; fortunately, the national policy of the geographical basis for numbering of US and Interstate highways being inverse of one another facilitated compliance to California's state policy..
Examples of these connection gaps are subject to dispute with unofficial, unsigned concurrencies with other routes to the parent.
Read more about this topic: List Of Gaps In Interstate Highways
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