The Dwight D. Eisenhower National System of Interstate and Defense Highways, commonly known as the Interstate Highway System, or the Eisenhower Interstate System, is a network of controlled-access highways that forms part of the National Highway System in the United States. The system extends throughout the contiguous United States and has routes in Hawaii, Alaska, and Puerto Rico.
The United States Numbered Highway System is an integrated network of roads and highways numbered within a nationwide grid in the contiguous United States. As the designation and numbering of these highways were coordinated among the states, they are sometimes called Federal Highways, but the roadways were built and have always been maintained by state or local governments since their initial designation in 1926.
Interstate 81 (I-81) is a north–south Interstate Highway in the eastern part of the United States. Its southern terminus is at I-40 in Dandridge, Tennessee; its northern terminus is on Wellesley Island, New York at the Canadian border, where the Thousand Islands Bridge connects it to Highway 137 and ultimately to Highway 401, the main Ontario freeway connecting Detroit via Toronto to Montreal. The major metropolitan areas along the route of I-81 include the Tri-Cities of Tennessee; Roanoke in Virginia; Harrisburg and the Wyoming Valley in Pennsylvania; and Syracuse in New York.
The Kansas Turnpike is a 236-mile (380 km) controlled-access toll road that lies entirely within the US state of Kansas. It runs in a general southwest–northeast direction from the Oklahoma border to Kansas City. It passes through several major Kansas cities, including Wichita, Topeka, and Lawrence. The turnpike is owned and maintained by the Kansas Turnpike Authority (KTA), which is headquartered in Wichita.
A concurrency in a road network is an instance of one physical roadway bearing two or more different route numbers. When two roadways share the same right-of-way, it is sometimes called a common section or commons. Other terminology for a concurrency includes overlap, coincidence, duplex, triplex, multiplex, dual routing or triple routing.
The Falmouth Spur is a short freeway connecting Interstate 95 (I-95) with I-295 and US Route 1 (US 1) north of Portland, Maine, in the United States. It carries the unsigned designation of Interstate 495 (I-495). As part of the Maine Turnpike, the mainline of which carries I-95, the Falmouth Spur is a toll road. The spur has only two interchanges—one at each end—and a toll booth in the middle. It is signed only for its destinations—I-95, I-295, and US 1—to minimize driver confusion.
The John Kilpatrick Turnpike, soon to be signed as Interstate 344, is a controlled-access toll road in Oklahoma City, Oklahoma. The turnpike forms a partial beltway that runs from State Highway 152 (SH-152) to an interchange with Interstate 35 (I-35) and I-44. At the eastern terminus, traffic continuing east merges with I-44 traffic, forming the Turner Turnpike. The Kilpatrick Turnpike is 29.4 miles (47.3 km) long.
Interstate 240 (I-240) is an Interstate Highway in southern Oklahoma City, Oklahoma, United States, that runs 16.22 miles (26.10 km) from I-40 to I-44. The Interstate overlaps State Highway 3 (SH-3), the longest Oklahoma state highway, for its entire length and functions as a southern bypass around the Downtown area.
State Highway 152 is a state highway running through west-central Oklahoma. It begins at the Texas state line, serving as a continuation of Texas State Highway 152, and continues east to end at Interstate 44 (I-44) in southwest Oklahoma City, a length of 149.2 miles (240.1 km). Along its route it serves three county seats: Sayre, Cordell, and Oklahoma City. Near its eastern end, it passes through the Oklahoma City suburb of Mustang. The easternmost 5.2 miles (8.4 km) of the route is a freeway linking Will Rogers World Airport to the Interstate system, this section will be truncated in 2024 and will be apart of I-240. SH-152 has no lettered spur routes.
Interstate 81 (I-81) is part of the Interstate Highway System that runs 855.02 miles (1,376.02 km) northward from Dandridge, Tennessee, to the Thousand Islands Bridge at the Canadian border near Fishers Landing, New York. In Tennessee, I-81 serves the northeastern part of the state, running 75.66 miles (121.76 km) from its southern terminus with I-40 in Dandridge to the Virginia state line in Bristol. The route serves the Tri-Cities region of the state and the eastern parts of the Knoxville metropolitan area, terminating about 35 miles (56 km) east of Knoxville. I-81 bypasses most cities that it serves, instead providing access via interchanges with state and federal routes. It remains in the Ridge-and-Valley topographic region of the Appalachian Mountains for its entire length in Tennessee, and runs in a northeast to southwest direction.
Interstate 77 (I-77) in Ohio is an Interstate Highway that runs for 163.03 miles (262.37 km) through the state. The highway crosses into Ohio on the Marietta–Williamstown Interstate Bridge over the Ohio River near Marietta. The northern terminus is in Cleveland at the junction with I-90. From the West Virginia state line to Cleveland, I-77 serves the cities of Marietta, Cambridge, New Philadelphia, Canton, Akron, and the Cleveland suburban city of Brecksville.
The Delaware State Route System consists of roads in the U.S. state of Delaware that are maintained by the Delaware Department of Transportation (DelDOT). The system includes the portions of the Interstate Highway System and United States Numbered Highways system located in the state along with state routes and other roads maintained by DelDOT. All roads maintained by the state are assigned a maintenance road number that is only marked on little white markers at intersections and on auxiliary plates below warning signs approaching intersections. These numbers are only unique in a specific county; some roads can be designated with multiple road numbers, and numbers do not necessarily correspond to the signed Interstate, U.S., or state route numbers. DelDOT maintains a total of 5,386.14 miles (8,668.15 km) of roads, comprising 89 percent of the roads within the state. Some large bridges in the state are maintained by other agencies including the U.S. Army Corps of Engineers and the Delaware River and Bay Authority. Roads in the system include multilane freeways, multilane surface divided highways, and two-lane undivided roads serving urban, suburban, and rural areas. Some of the roads maintained by DelDOT are toll roads, in which motorists must pay to use.
The Kickapoo Turnpike is a 19.6-mile (31.5 km) controlled-access toll road in the U.S. state of Oklahoma. The northern section from US-62 to I-44 opened to traffic on October 13, 2020. The southern segment from I-40 to US-62 opened to traffic on January 5, 2021. It will be signed as Interstate 335 in 2024, although a connection with I-35 will not be made until the southern extension of the turnpike to Purcell is built.
I-35 
I-40 
I-44 
I-235 
I-240 
I-244 
I-335 
I-344 
I-440 
I-444 