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Utah and Missouri. Actually, there are 5 Interstate highways in Utah and 17 in Missouri. The only state without any Interstate highways is Alaska.
California State Route 1; Interstate 95
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.
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.
A) freeways, expressways, interstate highways B) freeways, U.S. routes, state highways C) interstate highways, county routes, U.S. routes D) U.S. routes, state routes, expressways
I-90 and I-94 are east-west interstate highways in Montana. I-15 is the north-south interstate highway in Montana.
Alaska is the only state without any formal Interstate roads.
New York have 29 different routs of interstate highways.
Major highways in the state of South Dakota include Interstate 90, running east and west across the state and Interstate 29, running north and south. Other major highways include: US Highways 12, 14, 16, 81, 83, 85, 212, 281, and 385
Individual state highway departments. The Federal government provides most of the funding for Interstate & US Highways though.
Interstate highways are part of the Federal Highway System and are typically longer, connect cities across states, and have route numbers beginning with "I". State highways are maintained by individual states and usually serve travel within a single state, with route numbers specific to that state.
They are indicated by the letters that proceed the number. Example is I5 would be interstate 5 CA 15 would be state 15. Note that connecting routes betweeen interstate highways can be counted as interstate.