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The State Route System of Tennessee is maintained and developed by the
Tennessee Department of Transportation The Tennessee Department of Transportation (TDOT) is the department of transportation for the State of Tennessee, with multimodal responsibilities in roadways, aviation, public transit, waterways, and railroads. It was established in 1915 as the ...
(TDOT) in the U.S. state of
Tennessee Tennessee (, ), officially the State of Tennessee, is a landlocked U.S. state, state in the Southeastern United States, Southeastern region of the United States. It borders Kentucky to the north, Virginia to the northeast, North Carolina t ...
. Currently the state has of state-maintained roadways, including of
Interstate Highways 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 H ...
and of State Highways. All of the U.S. Routes in Tennessee have a state route routed concurrently with them, though the state route is hidden and only signed along the green mile marker signs that display mileage within each county. The state route system in Tennessee was established in 1923. Since the 1983 renumbering, state routes have been divided into primary and secondary routes with separate shields used for each.


Description

State routes in Tennessee are divided into primary and secondary routes, the former being part of the federal-aid primary highway system, and the latter part of the federal-aid secondary highway system. Most routes with primary designations also have secondary designations; very few state routes in Tennessee have only primary designations. Secondary segments of dual-designated routes are often considered primary routes, however. The Tennessee Department of Transportation maintains these routes under the "State Highways" title of state law, but designates them as "State Routes" State routes in Tennessee do not follow a systematic numbering system unlike the
U.S. Highway System The United States Numbered Highway System (often called U.S. Routes or U.S. Highways) 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 h ...
and some other states' highway systems. However, routes with similar numberings, especially short and newer secondary routes that were created during the 1983 takeover and renumbering, tend to be located close to each other. Older routes are generally more spread out. Overall, state route numbers have generally been designated sequentially as new routes have been incorporated into the system. Similar to the
California postmile California uses a postmile highway location marker system on all of its state highways, including U.S. Routes and Interstate Highways. The postmile markers indicate the distance a route travels through individual counties, as opposed to milep ...
system, mile markers for state routes in Tennessee are based on the mileage for each county, and not the entire route. The route's number is displayed in small text at the bottom of each mile marker. State routes that are overlaid on U.S. Routes are not signed; the route numbers are only displayed on the mile markers.


History

The Tennessee Department of Highways and Public Works was established by the
Tennessee General Assembly The Tennessee General Assembly (TNGA) is the state legislature (United States), state legislature of the U.S. state of Tennessee. It is a part-time bicameral legislature consisting of a Tennessee Senate, Senate and a Tennessee House of Representa ...
in 1915 and tasked with constructing, maintaining, and improving roads throughout the state. That year, the Memphis to Bristol Highway, later State Route 1, was designated as the first state highway in Tennessee. The
Federal Aid Road Act of 1916 The Federal Aid Road Act of 1916 (also known as the Bankhead–Shackleford Act and Good Roads Act), , , was enacted on July 11, 1916, and was the first federal highway funding legislation in the United States. The rise of the automobile at the sta ...
required states to establish a highway system in cooperation with the
United States Secretary of Agriculture The United States secretary of agriculture is the head of the United States Department of Agriculture. The position carries similar responsibilities to those of agriculture ministers in other governments The department includes several organi ...
for the purpose of the distribution of federal highway funds. The following year, the department was authorized by the state legislature to establish a state highway system. Both the federal aid system, which consisted of State Routes 1 through State Route 40, and the state aid system, which consisted of Routes 41 through 78, were jointly approved on October 1, 1923. This initial system consisted of of federal aid routes, and of state aid highways. When the
United States Numbered Highway System The United States Numbered Highway System (often called U.S. Routes or U.S. Highways) 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 ...
was created in 1926, most of the federal aid state routes were assigned a U.S. Route designation as part of this system, but retained their state designations. Governor
Austin Peay Austin Peay (; June 1, 1876 – October 2, 1927) was an American politician who served as the 35th governor of Tennessee from 1923 to 1927. He was the state's first governor since the Civil War to win three consecutive terms and the first to die ...
, who was elected in
1922 Events January * January 7 – Dáil Éireann (Irish Republic), Dáil Éireann, the parliament of the Irish Republic, ratifies the Anglo-Irish Treaty by 64–57 votes. * January 10 – Arthur Griffith is elected President of Dáil Éirean ...
, made road-building a central issue of his campaign. At the time, Tennessee was known as a "detour state", with many of its roads in poor condition compared to those of neighboring states. In 1924, the state implemented a two-cent gasoline tax for the purpose of improving roads, and throughout the 1920s, the department paved much of the newly-established state route system. As automobile usage increased over the next several decades, additional routes were added to the system. During this time, the state started using suffixed and special routes. Special designations included "-A" for alternate, "-Byp" for bypass, "-Bus" for business routes, "-Conn" and "-Spur" for connector and spur routes, and "-Temp" for temporary routes. By the time of the creation of the
Interstate Highway System 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 Hi ...
in 1956, the system had grown to approximately and roughly 170 numbered highways, including many special routes. Additional thoroughfares that connected to Interstate Highways were designated taken over by the highway department in the years afterwards. In 1972, the Tennessee Department of Highways was renamed the Tennessee Department of Transportation (TDOT). As traffic continued to increase throughout the state, cities and counties increasingly struggled to properly maintain their major thoroughfares, especially those with connected to Interstate Highways and other major roads. A 1983 study conducted by TDOT also found that a number of important roads were partially maintained by both the state and local governments. To address this problem, in 1983 the Tennessee General Assembly signed legislation allowing the state to assume control of of city and county maintained roads, and made an additional of rural roads eligible for state aid. This legislation was signed into law by Governor
Lamar Alexander Andrew Lamar Alexander Jr. (born July 3, 1940) is an American politician and attorney who served as a United States senator from Tennessee from 2003 to 2021. A member of the Republican Party, he also was the 45th governor of Tennessee from 1 ...
in May of that year. On July 1, 1983, TDOT took control of these roads, incorporating them into the state route system, and renumbered most of their special routes. As part of this process, a new functional classification system was adopted that divided state routes into secondary and primary routes, which was announced to the public in November 1983. This was done in an effort to reduce driver confusion, and new signs were posted throughout 1984 at a cost of $1.3 million (equivalent to $ in ). Secondary routes retained the original inverted triangle marker, with the "Tenn" removed.


See also

*
List of state routes in Tennessee The Tennessee state routes do not follow a systematic numbering system unlike the U.S. Highway System and some other states' highway systems. The routes are separated into primary and secondary routes though. Many of the routes are hidden in th ...
*


Notes


References

{{US numbered highways State highways in Tennessee 1923 establishments in Tennessee