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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]
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]
The U.S. Highways in Idaho are the segments of the United States Numbered Highway System owned and maintained by the Idaho Transportation Department (ITD) in the U.S. state of Idaho. Mainline highways
[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 ...
Idaho roads take top spot for roads in America, New Jersey sits at the bottom of the list, with just 50.7% of roads deemed acceptable.
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.
U.S. Highway 26 (US-26) runs east–west across south central Idaho for 402.5 miles (647.8 km). US-26 enters the state from Oregon across the Snake River east of Nyssa, Oregon , concurrent with US-20 and exits into Wyoming northwest of Alpine .
Media related to Roads in Idaho at Wikimedia Commons; Documents. Historic Survey of Roads in Idaho's State Highway System (2019) Maps. ITD Yearly Traffic Flow Maps, 1971–present; University of Alabama Maps of Idaho; Archive of ITD Maps, 1960s/70s and 2000s. Rand McNally maps, 1926 to 1957; 1936-1937 book of highway designations