Interstate 70 (I-70) is a major east–west Interstate Highway in the United States that runs from I-15 near Cove Fort, Utah, to a Park and Ride lot just east of I-695 in Baltimore, Maryland. I-70 approximately traces the path of U.S. Route 40 east of the Rocky Mountains. West of the Rockies, the route of I-70 was derived from multiple sources. The Interstate runs through or near many major cities, including Denver, Topeka, Kansas City, St. Louis, Indianapolis, Columbus, Pittsburgh, and Baltimore. The sections of the interstate in Missouri and Kansas have laid claim to be the first interstate in the United States. The Federal Highway Administration has claimed the section of I-70 through Glenwood Canyon, Colorado, completed in 1992, to be the last piece of the Interstate Highway system, as originally planned, to open to traffic. The construction of I-70 in Colorado and Utah is considered an engineering marvel, as the route passes through the Eisenhower Tunnel, Glenwood Canyon, and the San Rafael Swell. The Eisenhower Tunnel is the highest point along the Interstate Highway system, with an elevation of 11,158 ft (3,401 m).
Interstate 24 (I-24) is an Interstate Highway in the Midwestern and Southeastern United States. It runs diagonally from I-57, 10 miles (16 km) south of Marion, Illinois, to Chattanooga, Tennessee, at I-75. It travels through Illinois, Kentucky, Tennessee, and Georgia. As an even-numbered Interstate, it is signed as an east–west route, though the route follows a more southeast–northwest routing, passing through Nashville, Tennessee. The numbering deviates from the standard Interstate Highway System grid, lying further north than its number would indicate west of Nashville. I-24 constitutes the majority of a high-traffic corridor between St. Louis and Atlanta, a corridor which also includes I-64 and I-57 northwest of I-24, and I-75 southeast of I-24.
Interstate 71 (I-71) is a north–south Interstate Highway in the Great Lakes/Midwestern and Southeastern region of the United States. Its southern terminus is at an interchange with I-64 and I-65 in Louisville, Kentucky, and its northern terminus at an interchange with I-90 in Cleveland, Ohio. I-71 runs concurrently with I-75 from a point about 20 miles (32 km) south of Cincinnati, Ohio, into downtown Cincinnati. Almost three-quarters of the route lies east of I-75, thereby putting it out of its proper place in the Interstate grid. While most odd numbered Interstates are north–south, I-71 however is designated more of a northeast–southwest highway and mainly a regional route, serving Kentucky and Ohio. It links I-80 and I-90 to I-70, and ultimately links to I-40. Major metropolitan areas served by I-71 includes Louisville, Cincinnati, Columbus, and Cleveland.
State Route 2, formerly known as Inter-county Highway 2 until 1921 and State Highway 2 in 1922, is an east–west highway crossing most of northern Ohio. Its western terminus is at the Indiana state line near Hicksville where the route becomes Indiana State Road 37 which continues to Fort Wayne, Indiana. The eastern terminus of the route is in Painesville Township in Lake County at U.S. Route 20 (US 20).
U.S. Route 35 (US 35) is a United States Highway that runs southeast–northwest for approximately 412 miles (663 km) from the western suburbs of Charleston, West Virginia to northern Indiana. Although the highway is physically southeast–northwest, it is nominally north–south. The highway's southern terminus is in Teays Valley, West Virginia, near Scott Depot, at Interstate 64 (I-64). Its northern terminus is near Michigan City, Indiana, at US 20. As of 2020, the final West Virginia portion of the highway is being expanded to four lanes, mostly along a completely new route. The Ohio portion has been upgraded to a four-lane highway/freeway between the West Virginia state line and Trotwood, west of Dayton.
State Route 59 is an east–west state highway in the U.S. state of Ohio, serving the Akron metropolitan area. The western terminus of State Route 59 is in downtown Akron at a partial interchange with the Interstate 76/Interstate 77 concurrency, and the eastern terminus is at State Route 5, 0.5 miles (0.80 km) east of Ravenna. The route is approximately 23 miles (37 km) long and was certified in 1969 over what had previously been part of SR 5. It serves as a major or as the primary east–west roadway for the cities of Cuyahoga Falls, Kent, Ravenna, and Stow, the village of Silver Lake, and Franklin and Ravenna Townships.
Interstate 275 (I-275) is an 83.71-mile-long (134.72 km) highway in Ohio, Indiana, and Kentucky that forms a complete beltway around the Cincinnati area, and includes a part in a state (Indiana) not entered by the parent route. It had been the only auxiliary interstate that enters three states, but that changed in July 2018 when I-295 in Delaware and New Jersey was extended into Pennsylvania. It is the longest beltway with an Interstate highway designation in the United States, enclosing an area of over 250,000 acres (100,000 ha). It is also the third longest beltway overall in the United States—only the Sam Houston Tollway and the Grand Parkway encircling Metro Houston are longer. For a short distance in northwest Hamilton County it overlaps with I-74 and U.S. Highway 52.
State Route 315, known locally as the Olentangy Freeway, running almost parallel to Olentangy River Road for most of its length, is a north–south highway in central Ohio, in the Columbus metropolitan area. It may be seen abbreviated as SR 315, OH-315, or simply 315. Its southern terminus is at the south junction of I-70 and I-71 in Columbus, and its northern terminus is at US 23 near Delaware. It is a controlled access freeway from its southern terminus to I-270. The controlled access section carries two or three lanes in each direction, depending on the location. North of I-270, it becomes a two-lane road. It roughly follows the Olentangy River for about two-thirds of its length. The route passes through The Ohio State University campus. The section between Interstate 670 and Interstate 70 is known as the West Innerbelt, and it is commonly referred to as such in traffic reports. The original name of this section was Sandusky Street.
Interstate 270 (I-270) is an auxiliary interstate highway that forms a beltway loop freeway in the Columbus metropolitan area in the U.S. state of Ohio, commonly known locally as The Outerbelt, or the Jack Nicklaus Freeway. The zero-milepost is at the junction with I-71 east of Grove City, Ohio. I-270, along with I-670, provides access to John Glenn Columbus International Airport. The entire length of I-270 is 54.97 miles (88.47 km). It is one of four Interstate loops not to run concurrently with another Interstate freeway, the others being I-295 in Florida, I-485 in North Carolina, and I-610 in Texas.
An Innerbelt Freeway is a set of freeway facilities arranged in a loop that serves the interior of a major city, primarily as a traffic reliever for downtown commuters. In comparison, an "Outerbelt Freeway" or "Beltway" typically refers to freeway facilities serving the perimeter of a central city and/or its suburbs.
Interstate 10 (I-10) is a transcontinental Interstate Highway in the United States, stretching from Santa Monica, California, on the Pacific Ocean, to Jacksonville, Florida. The segment of I-10 in California runs east from Santa Monica through Los Angeles, San Bernardino, and Palm Springs before crossing into the state of Arizona. In the Greater Los Angeles area, it is known as the Santa Monica Freeway and the San Bernardino Freeway, linked by a short concurrency on I-5 at the East Los Angeles Interchange. I-10 also has parts designated as either the Rosa Parks Freeway, the Redlands Freeway, or the Christopher Columbus Transcontinental Highway.
The Ohio Department of Transportation is the administrative department of the Ohio state government responsible for developing and maintaining all state and U.S. roadways outside of municipalities and all interstates in the state of Ohio, with exception of the Ohio Turnpike. In addition to highways, the department also helps develop public transportation and public aviation programs. ODOT is headquartered in Columbus, Ohio. Formerly, under the direction of Michael Massa, ODOT had also first initiated a series of interstate-based Travel Information Centers for the traveling public, which was later transferred to local sectors. The Director of Transportation is part of the Governor's Cabinet.
Interstate 90 (I-90) runs east–west across the northern tier of the U.S. state of Ohio. Much of it is along the Ohio Turnpike, but sections outside the turnpike pass through Cleveland and northeast into Pennsylvania.
In the U.S. state of Missouri, Interstate 70 (I-70) is generally parallel to the Missouri River. This section of the transcontinental Interstate begins at the Kansas state line on the Lewis and Clark Viaduct, concurrent with U.S. Routes 24, 40, and 169, and the east end is on the Stan Musial Veterans Memorial Bridge in St. Louis.
U.S. Route 50 runs east–west across the southern part of the U.S. state of Ohio, passing through Cincinnati, Chillicothe, and Athens. It is mainly a two-lane road except for the easternmost and westernmost parts. Near Athens it becomes part of State Route 32, a four-lane divided highway known as Corridor D, and from Reedsville to the Ohio/West Virginia border it also overlaps State Route 7 before crossing into Parkersburg, West Virginia.
Interstate 44 (I-44) in the U.S. state of Missouri runs northeast from the Oklahoma state line near Joplin to I-70 in Downtown St. Louis. It runs for about 293 miles (472 km) in the state.
U.S. Route 20 (US 20) in Indiana is a main east–west highway that is parallel to the Indiana Toll Road. The western terminus of US 20 is at the Illinois state line and the eastern terminus is at the Ohio state line. US 20 through Whiting, East Chicago, and Gary is concurrent with US 12 twice. The route varies between one-way, two-lane, and four-lane streets, in northwestern Indiana. From the east side of Gary to west of South Bend, US 20 is a four-lane undivided highway. The route then heads around the west and south sides of South Bend and Elkhart as a four-lane limited access divided highway. East of State Road 15 (IN-15), US 20 is two-lane rural highway.
U.S. Route 24 in Indiana runs east from the Illinois state line to Huntington. At Huntington, US 24 turns northeast and runs to Fort Wayne; it then runs concurrently with Interstate 69 (I-69) and I-469 to bypass the city before entering Ohio at the state line east of Fort Wayne. The segment of US 24 between Logansport and Toledo, Ohio is part of the Hoosier Heartland Industrial Corridor project of the Intermodal Surface Transportation Efficiency Act.
State Route 291 (SR 291) is a 4.14-mile-long (6.66 km) north–south state highway in the northeastern quadrant of the U.S. state of Ohio. The southern terminus of the highway is at a T-intersection with Fowles Road in Middleburg Heights, nearly 0.50 miles (0.80 km) west of where Fowles Road meets U.S. Route 42. Its northern terminus is at a signalized T-intersection with SR 17 on the border between Brook Park and Cleveland, immediately west of where SR 17 passes underneath Interstate 71 south of Interstate 480.
U.S. Route 33 (US 33) is a United States Numbered Highway running from near Elkhart, Indiana, to Richmond, Virginia. Within the state of Ohio, it is a predominantly southeast–northwest highway running from west of Willshire before crossing over into West Virginia via the Ravenswood Bridge over the Ohio River. The route runs through largely rural territory throughout most of the state's west-central, central, and southeastern regions, although it also passes through large portions of downtown Columbus.
I-70 in Columbus 
I-71 in Columbus
I-270 / US 62 near Gahanna 
