List of unsigned auxiliary Interstate Highways

From Wikipedia, the free encyclopedia

Some auxiliary Interstate Highways are not signed, typically because the routes are already known by another name, and marking them could confuse motorists. A small fraction of three-digit Interstates, especially very short ones (in terms of physical length), are not signed.

Interstate Vicinity Description
I-305 Sacramento, CA Signed as US 50 and Business Loop I-80. It was part of I-80 until October 1983.
I-110 El Paso, TX Signed as US 54, though it was once signed before US 54 was moved to the road.
I-910 New Orleans, LA Signed as Business Route US 90.
I-315 Great Falls, MT Signed as Business Loop I-15.
I-124 Chattanooga, TN Signed as US 27.
I-444 Tulsa, OK Signed as US 75.
I-345 Dallas, TX Signed US 75 (northbound) I-45 (southbound).
I-478 New York City, NY Signed as the Brooklyn-Battery Tunnel.
I-878 New York City, NY Signed as SR 878.
I-580 Reno, NV Signed as US 395.
I-194 Bismarck, ND Signed as SH 810.
I-495 Portland, ME Signed as a connection between I-95 and I-295. It was redesignated from part of I-95 on January 5, 2004.
I-595 Annapolis, MD Signed as US 50 from the Washington, DC, area east to Annapolis, Maryland.
I-695 Washington, DC Signed as a short connection from I-395 to I-295.
I-296 Grand Rapids, MI Signed as US 131.

[edit] Previously unsigned Interstate Highways

Interstate Vicinity Description
H-201 Honolulu, HI Unsigned until July 2004, formerly signed as Route 78.

[edit] External links

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Main Interstate Highways (multiples of 5 in pink)		 Interstate Highway marker
4 5 8 10 12 15 16 17 19 20 22 24 25 26 27 29 30
35 37 39 40 43 44 45 49 55 57 59 64 65 66 68 69
70 71 72 73 74 75 76 (W) 76 (E) 77 78 79 80 81 82
83 84 (W) 84 (E) 85 86 (W) 86 (E) 87 88 (W) 88 (E) 89 90
91 93 94 95 96 97 99 (238) H-1 H-2 H-3
Unsigned  A-1 A-2 A-3 A-4 PRI-1 PRI-2 PRI-3
Lists  Primary  Main - Intrastate - Suffixed - Future - Gaps
Auxiliary  Main - Future - Unsigned
Other  Standards - Business - Bypassed