List of suffixed Interstate Highways
- List of suffixed Interstate Highways
Presently, the Interstate Highway System includes four suffixed routes - the Interstate 35 split into Interstate 35E and Interstate 35W at Dallas-Fort Worth, Texas and a similar split into Interstate 35E and Interstate 35W at Minneapolis-St. Paul, Minnesota. However, there were once many more, as the three-digit Interstates were not designated until after all major routes were assigned numbers, including some short connections and spurs. (A few of the shortest, including I-190 and I-195, were assigned three-digit numbers almost immediately.) Most were not equal splits like on I-35, but had the main route continue through, and often the suffixed route never returned to its parent. In 1980, AASHTO abolished the majority of suffixes due to confusion, renumbering them as three-digit Interstates, but several that return to their parents were kept. Interstate 15E has since become Interstate 215, but both I-35E/I-35W splits still exist.
List of suffixed Interstates
Current routes
Former routes
References
* [http://www.roadfan.com/mtrfaq.html#4 misc.transport.road Frequently Asked Questions - What are/were all the suffixed interstates?]
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