Interstate 315

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Business Interstate Loop 15 is a 0.82 mile unsigned Interstate 315 spur that links Interstate 15 to Great Falls via Business Route 15. The interstate is signed as Business loop Interstate 15 co-signs with US-89, I-315 only appears on mapquest or Montana maps which displays insets. However the AASHTO never put out any Interstate 315 signs.

Auxiliary routes of Interstate 15
I-115 Montana
I-215 California - Nevada - Utah
I-315 Montana
I-515 Nevada
past/
future
I-415: Utah


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