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The Idaho Transportation Department (ITD) is responsible for the establishment and classification of a state highway network, including 5,000 miles (8,000 km) of roads that are classified as Interstate Highways, U.S. Highways, and state highways within the state of Idaho in the United States. [1]
[3] [4] The Idaho section of I-84 is maintained by the Idaho Transportation Department (ITD), which conducts an annual survey of traffic on certain highway segments that is expressed in terms of annual average daily traffic (AADT), a measure of traffic volume for any average day of the year. Average daily traffic volumes on I-84 in 2018 ranged ...
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.
Part of original loop that once ran from I-90 exit 57 in Osburn to exit 60 in Silverton via Silver Valley road. Split into two separate spurs I-90 BL: 1.243: 2.000 I-90 exit 61 near Wallace: I-90 exit 62 in Wallace — — Originally part of I-90 that contained a traffic signal before entering Wallace. Became I-90BL when I-90 was rerouted north ...
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.
State Highway 41 (SH-41) is a state highway mostly in the U.S. state of Idaho.It runs from Interstate 90 in Post Falls to U.S. Route 2 on the Washington state line. The northernmost 0.41 miles (0.66 km) of SH-41 run along State Street along the state line, with the southbound lane in the town of Newport, Washington, and the northbound lane in Oldtown, Idaho.
State Highway 51 (SH-51) is a state highway in southwestern Idaho from Mountain Home south to the Nevada border, where it continues as State Route 225 to Elko. It is the major north–south road in Owyhee County .
Interstate 90 (I-90) is a transcontinental Interstate Highway that runs east–west across the northern United States. Within the state of Idaho, the freeway travels for 74 miles (119 km) from the Washington border near Spokane to Coeur d'Alene and the panhandle region at the north end of the state.