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The major highways in the state of Iowa are Interstate 35 and Interstate 29. They join the north and south part of the state. Interstate 80 and Interstate 380 join the east and west side of the state.
Interstate 77 crosses West Virginia from north to south. It crosses the Ohio River near Parkersburg and goes south through Charleston (state capital) and into Virginia.
I-35 is the primary north to south interstate highway in Iowa. It enters Iowa from the Minnesota state line at Council Bluffs, Iowa and runs south to the Missouri state line at Lamoni, Iowa.
interstate
I-90 and I-94 are east-west interstate highways in Montana. I-15 is the north-south interstate highway in Montana.
Alaska does not have an interstate highway as an interstate highway requires 4 lane divided road connected at the very minimum state. Alaska is separated from the 48 other states. Thus can not have an interstate highway. Alaska has state highways and it has national scenic routes but are not able to have an interstate highway.
Interstate 40.
Signage is the only reliable way to tell. State highways will have a state highway sign (what that looks like varies from state to state), while interstate highways will have the blue and red interstate shield.
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Interstate Highway 93, Interstate 95 and Interstate 89.
Interstate 15 runs north-south across the entire length of Utah, from Portage, UT, on the Idaho state line, to St. George, UT, on the Arizona state line.
Three Interstate Highways transect Washington State. These include Interstate 82, Interstate 90, and Interstate 5. Interstate 90 crosses the entire state at a length of 297.52 miles.