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State Highway 21 (SH-21), also known as the Ponderosa Pine Scenic Byway, [2] is a state highway in Idaho.It runs from Boise to Stanley, primarily as a two-lane road.With two-thirds of its length in Boise County, it passes by historic Idaho City and the village of Lowman to the western edge of the Sawtooth Mountains, then along their northern boundary to Stanley.
US-95 continues into Idaho from southeastern Oregon as an undivided two-lane highway for the majority of its length. As it is the state's primary north–south highway, Idaho is in the process of widening US-95 to an Interstate-style divided four-lane highway, from the Oregon state line in the southwest to Eastport at the northern border with Canada at Kingsgate, British Columbia.
US 95 is designated the I.O.N. Highway No. 456 (see Oregon highways and routes); "I.O.N." stands for Idaho–Oregon–Nevada. This section of highway is a primary commercial route between Boise and northern California, connecting to I-80 at Winnemucca, Nevada. US 95 crosses into the Mountain Time Zone approximately 35 miles (56 km) north of Nevada.
As the two routes approach Boise, they intersect three state highways: State Highway 16 (SH-16), SH-55 on the Eagle–Boise city line, and SH-44 in Garden City. In Boise, as US-26 and US-20 merge eastward onto I-184 , the Interstate designation ends there but the freeway ends in about 0.75 miles (1.21 km).
At the next exit, SH-55 leaves the concurrency. Then, in Boise, the freeway comes across I-184 which serves Downtown Boise. Between exits 52 and 54, the freeway is situated north adjacent to Boise Airport, with exit 53 serving the main terminal. Also, at exit 54, US 20 and US 26 rejoin the freeway. [2]
In 1977, Idaho officials recommended that I-80N be renumbered to I-84. The motion was seconded by officials in Utah (who initially proposed this as I-82), but opposed by Oregon and Washington. The motion passed on July 7, 1977, and the states were given until July 1, 1980, to implement a coordinated renumbering strategy. [ 4 ]
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The Interstate Highways in Idaho are the segments of the Dwight D. Eisenhower National System of Interstate and Defense Highways owned and maintained by the Idaho Transportation Department (ITD) in the U.S. state of Idaho. The state has five Interstate Highways that total approximately 611 miles (983 km) in length. [1]
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