Individual state highway departments. The Federal government provides most of the funding for Interstate & US Highways though.
New York have 29 different routs of interstate highways.
California
Interstate, US, State and Farm-To-Market highways are maintained by the Texas Department of Transportation. County highways and roads are generally maintained at the county level.
yes
35-65 MPH on most highways in the US
Highways And Railroads
National highway : Vehicles moving all over the nation on highways, and the roads are maintained by the central Govt. State highway :Vehicles moving within their own states and it is maintained by the state government only. There is only two highways i.e.., National highways and State highways. There is no Village highways. . National highways connect various regions of the country whilst state highways connect various regions in a state. It all depends on who has the power to dig the road, whether central, state or village administration.
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
The two types of road are national highways and state highways. National highways go anywhere and are owned and maintained by the government of the country (such as the Interstate in the USA). State highways are roads contained within a single state. The state government is responsible for maintenance of these roads.
65 In Texas is 70 mph
Interstates 25, 70, and 76.US Highways 50, 287, 40, 6, 83, 84, 85, 24, and 285.