Individual state highway departments. The Federal government provides most of the funding for Interstate & US Highways though.
The local or county government is responsible for maintaining streets and roads. Major connecting roads and limited access highways may be maintained by the state.
Auxiliary Interstate Highways and Primary Interstate Highways
Utah and Missouri. Actually, there are 5 Interstate highways in Utah and 17 in Missouri. The only state without any Interstate highways is Alaska.
The major highways are highway 50 highway 99 and highway 101 As well as Interstate 5, Interstate 40, Interstate 15, Interstate 8, and Interstate 80.
Interstate highways
Interstate highways are usually identified on shield shaped signs.
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.
Interstate Highways 95 and 295 and US Highway 1.
I-90 and I-94 are east-west interstate highways in Montana.
I-90 and I-94 are east-west interstate highways in Montana.
Interstate 80 and Interstate 25.
I-90 and I-94 are east-west interstate highways in Montana.