The number I-184 was briefly considered for a portion of RI 10.

Interstate 184 is a short interstate spur route of Interstate 84 located in Idaho. I-184 connects I-84 travelers to downtown Boise. The western terminus of I-184 is with I-84; the eastern terminus is with co-signed U.S. Highway 20 and U.S. Highway 26.

Interstate 184 is the only three-digit interstate route in Idaho. During the 1970s, it was known as "I-180N" (I-84 was then known as I-80N) and was the only three-digit interstate to have a directional suffix.