History
Until 1980, the freeway was known on paper as Interstate 180N, when Interstate 84 was known as Interstate 80N. This was the only signed suffixed auxiliary Interstate route in the nation, though it was not upgraded to Interstate standards until after the parent route was renamed. Other suffixed routes around the country either were too short to merit an auxiliary route or used the unsuffixed route number for its auxiliary routes. This was illustrated by Interstate 80S in Pennsylvania, whose auxiliary routes were I-180, I-280, I-480, and I-680 respectively.
When Interstate 80N became Interstate 84, the road became Business Loop I-84 through Boise. The current I-184 designation was implemented when the construction upgrading the route to Interstate standards was completed in 1989.
Interstate 184 is the only three-digit interstate route in Idaho.
Read more about this topic: Interstate 184
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