The system of United States Numbered Highways (often called U.S. Routes or U.S. Highways) is an integrated system of roads and highways in the United States numbered within a nationwide grid. As these highways were coordinated among the states, they are infrequently referred to as Federal Highways, but they have always been maintained by state or local governments since their initial designation in 1926. The numbers and locations are coordinated by the American Association of State Highway and Transportation Officials (AASHTO).[1] The only federal involvement in the AASHTO is a non-voting seat for the United States Department of Transportation. North-to-south highways are odd-numbered, with lowest numbers in the east and highest numbers in the west. Similarly, west-to-east highways are even-numbered, with the lowest numbers in the north and highest numbers in the south. Major north–south routes have numbers ending in "1" while major east–west routes have numbers ending in "0". Three-digit numbered highways are spur routes of each parent highway but are not necessarily connected to their parent route. Divided routes exist to provide two alignments to one route, even though many have been eliminated, while special routes, usually posted with a banner, can provide various routes, such as an alternate or bypass route, for a U.S. Highway. The Interstate Highway System has largely replaced the U.S. Highways for through traffic, though many important regional connections are still made by U.S. Highways, and new routes are still being added.
Prior to the U.S. Routes, auto trails were predominant in marking roads through the United States. In 1925, the Joint Board on Interstate Highways, recommended by American Association of State Highway Officials (AASHO), worked to form a national numbering system for roads. After several meetings, a final report was approved by the Department of Agriculture in November 1925. After numerous complaints from across the country about the assignment of routes, several modifications were made and the U.S. Highway System was approved in November 1926. As a result of compromises made to get the U.S. Highway System approved, many routes divided into two alignments to serve different towns. In subsequent years, the AASHTO called for splits in U.S. Routes to be eliminated. Expansion of the system continued until 1956 when the Interstate Highway System was formed and many U.S. Routes were replaced by Interstate Highways. Despite the Interstate system, U.S. Routes are still used, and often used as alternate routes for Interstate highways during heavy traffic or accidents.
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In general, U.S. Routes do not have a minimum design standard, unlike the later Interstate Highways, and are not usually built to freeway standards, although some stretches of U.S. Routes do meet those standards. Many are the main streets of the cities and towns through which they run. However, new additions to the system must "substantially meet the current AASHTO design standards".[1]
Except for toll bridges and tunnels, very few U.S. Routes are toll roads. AASHTO policy says that a toll road may only be included as a special route, and that "a toll-free routing between the same termini shall continue to be retained and marked as a part of the U.S. Numbered System."[1] Although U.S. Route 3 meets this obligation, as in New Hampshire, it does not actually follow tolled portions of the Everett Turnpike. However, four toll roads in the system follow this:[2]
The two-digit U.S. Routes follow a simple grid, in which odd-numbered routes run generally north to south and even-numbered routes run generally east to west. (U.S. Route 101 is considered a two-digit route, its first "digit" being 10.) The numbering pattern for U.S. Routes is the reverse of that for the Interstate Highway numbers—U.S. Routes proceed from low even numbers in the north to high even numbers in the south, and from low odd numbers in the east to high odd numbers in the west. Numbers ending in 0 or 1 (and U.S. Route 2[3]), and to a lesser extent in 5, were considered main routes in the early numbering, but extensions and truncations have made this distinction largely meaningless. For example, U.S. Route 6 was until 1964 the longest route (that distinction now belongs to U.S. Route 20). The Interstate Highway System's numbering grid, which has numbers increasing from west-to-east and south-to-north, is intentionally opposite from the U.S. grid, to keep identically numbered routes apart and to keep them from being confused with one another.[4]
Three-digit numbers are assigned to spurs of two-digit routes. For instance, U.S. Route 201 splits from U.S. Route 1 at Brunswick, Maine, and runs north to Canada.[5] Not all spurs travel in the same direction as their "parents"; some are only connected to their "parents" by other spurs, or not at all, instead only traveling near their "parents". As originally assigned, the first digit of the spurs increased from north to south and east to west along the "parent"; for example, U.S. Route 60 junctioned, from east to west, U.S. Route 160 in Missouri, U.S. Route 260 in Oklahoma, U.S. Route 360 in Texas, and U.S. Route 460 and U.S. Route 560 in New Mexico.[6] As with the two-digit routes, three-digit routes have been added, removed, extended and shortened; the "parent-child" relationship is not always present. Several spurs of the decommissioned U.S. Route 66 still exist, and U.S. Route 191 travels from border to border, while U.S. Route 91 has been largely replaced by Interstate 15.[5][7]
Several routes approved since 1980 do not follow the numbering pattern:
In addition, U.S. Route 163, designated in 1970, is nowhere near U.S. Route 63.[5][9] The short U.S. Route 57, approved ca. 1970, connects to Federal Highway 57 in Mexico, and lies west of former U.S. Route 81.[5][8]
While AASHTO guidelines specifically prohibit Interstate Highways and U.S. Routes from sharing a number within the same state[10] (which is why there are no Interstates 50 or 60), the initial Interstate numbering approved in 1958 violated this with Interstate 24 and U.S. Route 24 in Illinois and Interstate 40, Interstate 80, U.S. Route 40 and U.S. Route 80 in California (US 40 and US 80 were removed from California in its 1964 renumbering).[7] Some recent and proposed Interstates, some of them out-of-place in the grid, also violate this: Interstate 41 and U.S. Route 41 in Wisconsin (which will run concurrently),[11] Interstate 49 and U.S. Route 49 in Arkansas,[5][12] Interstate 69 and U.S. Route 69 in Texas,[5][13] and Interstate 74 and U.S. Route 74 in North Carolina (which run concurrently).[14]
For reasons unknown to even the Department of Transportation, there were never any U.S. Routes numbered 39, 47, 86 and 88.
Divided routes have been around since 1926, and designate roughly-equivalent splits of routes. For instance, U.S. Route 11 splits into U.S. Route 11E (east) and U.S. Route 11W (west) in Knoxville, Tennessee, and the routes rejoin in Bristol, Virginia. Occasionally only one of the two routes is suffixed; U.S. Route 6N in Pennsylvania does not rejoin U.S. Route 6 at its west end. AASHTO has been trying to eliminate these since 1934;[15] its current policy is to deny approval of new ones and to eliminate existing ones "as rapidly as the State Highway Department and the Standing Committee on Highways can reach agreement with reference thereto".[1]
Special routes—those with a banner such as alternate or bypass—are also managed by AASHTO.[1] These are sometimes designated with lettered suffixes, like A for alternate or B for business.[16]
The official route log, last published by AASHTO in 1989, has been named United States Numbered Highways since its initial publication in 1926. Within the route log, "U.S. Route" is used in the table of contents, while "United States Highway" appears as the heading for each route. All reports of the Special Committee on Route Numbering since 1989, use "U.S. Route", and federal laws relating to highways use "United States Route" or "U.S. Route" more often than the "Highway" variants.[17] The use of U.S. Route or U.S. Highway on a local level depends on the state, with some states such as Delaware using "route" and others such as Colorado using "highway".[18][19]
In the early 1910s, auto trail organizations—most prominently the Lincoln Highway - began to spring up, marking and promoting routes for long-distance automobile travel. While many of these organizations worked with towns and states along the route to improve the roadways, others simply chose a route based on towns that were willing to pay dues, put up signs, and did little else.[20]
Wisconsin was the first state in the U.S. to number its highways, erecting signs in May 1918.[20] Other states soon followed, and the New England states got together in 1922 to establish the six-state New England Interstate Routes.[21]
Behind the scenes, the federal aid program had begun with the passage of the Federal Aid Highway Act of 1916, providing 50% monetary support from the federal government for improvement of major roads. The Federal Aid Highway Act of 1921 limited the routes to 7% of each state's roads, while 3/7 had to be "interstate in character". Identification of these main roads was completed in 1923.[20]
The American Association of State Highway Officials (AASHO), formed in 1914 to help establish roadway standards, began to plan a system of marked and numbered "interstate highways" at its 1924 meeting. AASHO recommended that the Secretary of Agriculture work with the states to designate these routes.[20]
Secretary Howard M. Gore appointed the Joint Board on Interstate Highways, as recommended by AASHO, on March 2, 1925. The Board was composed of 21 state highway officials and three federal Bureau of Public Roads officials. At the first meeting, on April 20 and 21, the name—U.S. Highway—was adopted. It was also decided that the system would not be limited to the federal-aid network; if the best route did not receive federal funds, it would still be included. The tentative design for the U.S. Highway shield was also adopted, based on the shield found on the Great Seal of the United States.[20]
Opposition soon formed from the auto trail associations, who rejected the elimination of the highway names. Six regional meetings were held to hammer out the details—May 15 for the West, May 27 for the Mississippi Valley, June 3 for the Great Lakes, June 8 for the South, June 15 for the North Atlantic, and June 15 for New England. The auto trail associations were not able to address the meetings. However, as a compromise, they talked with the Joint Board members and came up with a general agreement with their plans. The tentative system added up to 81,000 miles (130,000 km), 2.8% of the public road mileage at the time.[20]
The second full meeting was held August 3 and 4, 1925. At that meeting, discussion was held over the appropriate density of routes. William F. Williams of Massachusetts and Frederick S. Greene of New York favored a system of only major transcontinental highways, while many states recommended a large number of roads of only regional importance. Greene in particular intended New York's system of only four major through routes as an example to the other states. Many states agreed in general with the scope of the system, but believed the Midwest to have added too many routes. The shield, with few modifications from the original sketch, was adopted at that meeting, as was the decision to number rather than name the routes. A preliminary numbering system, with eight major west–east and ten major north–south routes, was deferred to a numbering committee "without instructions".[20]
After working with states to get their approval, the system had expanded to 75,800 miles (122,000 km), or 2.6% of total mileage, over 50% more than the plan approved August 4. The skeleton of the numbering plan was suggested on August 27 by Edwin Warley James of the BPR, who matched parity to direction, and laid out a rough grid. Major routes from the earlier map were assigned numbers ending in 0, 1 or 5 (5 was soon relegated to less-major status), and short connections received three-digit numbers based on the main highway they spurred from. The five-man committee met September 25, and submitted the final report to the Joint Board secretary on October 26.[20] The board sent the report to the Secretary of Agriculture of October 30, and he approved it November 18, 1925.[6]
The new system was both praised and criticized by local newspapers, often depending on whether that city ended up on a major route. While the Lincoln Highway Association understood and supported the plan, partly because they were assured of getting the U.S. Route 30 designation as much as possible, most other trail associations lamented their obsolescence. At their January 14–15, 1926 meeting, AASHO was flooded with complaints.[20]
In the Northeast, New York still wanted fewer routes, and Pennsylvania, which had been absent from the local meetings, convinced AASHO to add a dense network of routes, which had the effect of giving six routes termini along the state line. (Only U.S. Route 220 still ends near the state line, and now it ends at an intersection with future Interstate 86.) The indirect nature of U.S. Route 20, passing through Yellowstone National Park, led Idaho and Oregon to request that U.S. Route 30 be swapped with US 20 to the Pacific coast.[20]
Many local disputes centered on the choice between two roughly equal parallel routes, often competing auto trails. At their January meeting, AASHO approved the first two of many split routes (specifically U.S. Route 40 between Manhattan, KS and Limon, CO and U.S. Route 50 between Baldwin City, KS and Garden City, KS). In effect, each of the two routes received the same number, with a directional suffix indicating its relation to the other. These splits were initially shown in the log as—for instance—US 40 North and US 40 South, but were always posted as simply US 40N and US 40S.[20]
The most heated argument, however, was the issue of US 60. The Joint Board had assigned that number to the Chicago-Los Angeles route, which ran east from Los Angeles to Oklahoma City, but then angled sharply to the northeast, running more north–south than west–east in Illinois. Kentucky strongly objected to this, as it had been left off any of the major west–east routes, instead receiving the U.S. Route 62 designation. This, along with the part of U.S. Route 52 east of Ashland, KY, was assigned the U.S. Route 60 number in January 1926, while US 62 was given to the Chicago-Los Angeles route, contingent on the approval of the states along the former US 60. But Missouri and Oklahoma did object—Missouri had already printed maps, and Oklahoma had prepared signs. A compromise was proposed, in which US 60 would split at Springfield, MO into US 60E and US 60N, but both sides objected. The final solution resulted in the assignment of U.S. Route 66, which did not end in zero, but was still seen as a nice round number.[20]
With 32 states already marking their routes, the plan was approved by AASHO on November 11, 1926.[20] This plan included a number of directionally split routes, several discontinuous routes (including U.S. Route 6, U.S. Route 19 and U.S. Route 50), and some termini at state lines.[22] Major numbering changes had been made in Pennsylvania by the publishing of the first route log in April 1927, in order to align the routes to the auto trails,[23] and U.S. Route 15 had been extended across Virginia.[24]
Much of the early criticism of the U.S. Highway System focused on the choice of numbers to designate the highways, rather than names. Some saw a numbered highway system as cold and heartless compared to the more colorful names of the auto trail systems. The New York Times wrote, "The traveler may shed tears as he drives the Lincoln Highway or dream dreams as he speeds over the Jefferson Highway, but how can he get a 'kick' out of 46, 55 or 33 or 21?"[4] The writer Ernest McGaffey was quoted as saying, "Logarithms will take the place of legends, and 'hokum' for history.":[20]
When the U.S. numbered system was started in 1925, a few optional routings were established which were designated with a suffixed letter after the number indicating "north," "south," "east," or "west". While there are still a few roads in the system numbered in this manner, it is believed that they should be eliminated wherever possible, by the absorption of one of the optional routes into another route.
In 1934, AASHO attempted to eliminate many of the split routes by removing them from the log, and designating one of each pair as a three-digit or alternate route, or in one case U.S. Route 37. AASHO described its renumbering concept in the October 1934 issue of American Highways:[15]
Wherever an alternate route is not suitable for its own unique two-digit designation, standard procedure assigns the unqualified number to the older or shorter route, while the other route uses the same number marked by a standard strip above its shield carrying the word "Alternate." Most states adhere to this approach. However, some maintain legacy routes which violate the usual rules in various ways. Examples can be found in California, Mississippi, Nebraska, Oregon, and Tennessee. In 1952, AASHO permanently recognized the splits in U.S. Route 11, U.S. Route 19, U.S. Route 25, U.S. Route 31, U.S. Route 45, U.S. Route 49, U.S. Route 73, and U.S. Route 99.[15][25]
General expansion and the occasional elimination continued to occur through the years. One of the more interesting cases was the proposed extension of U.S. Route 97 to Alaska along the Alaska Highway, canceled because the Canadian Yukon Territory refused to renumber its section as 97.[26]
For the most part, the U.S. Routes remained the primary method of inter-city travel; the main exceptions were toll roads such as the Pennsylvania Turnpike and parkway routes such as the Merritt Parkway. Many of the first high-speed roads were U.S. Highways: the Gulf Freeway carried U.S. Route 75,[27] the Pasadena Freeway carried U.S. Route 66,[28] and the Pulaski Skyway carried U.S. Route 1 and U.S. Route 9.[29]
The Federal-Aid Highway Act of 1956 appropriated funding for the Interstate Highway System, a vast network of freeways across the country. By 1957, AASHTO had decided to assign a new grid—numbered in the opposite directions as the U.S. Highway grid—to the new routes. Though the Interstate numbers were to supplement, rather than replace, the U.S. Route numbers, in many cases (especially in the west) they were routed along the new Interstates.[7] Major decommissioning began with California's highway renumbering in 1964, and the 1985 removal of U.S. Route 66 is often seen as the end of an era.[30]
The last major U.S. Route to be constructed was US 12 on the Idaho side of Lolo Pass, completed in 1962. The last remaining segment of unpaved U.S. Route was US 183 between the villages of Rose and Taylor, Nebraska, which was paved ca. 1967.[31]
In 1995 the National Highway System was defined which included both the Interstate Highway System and also other roads, which are important to the nation's economy, defense, and mobility.
AASHTO has recognized that state highways are now symbols of good roads as the U.S. Routes once were. Thus it has acted to rationalize the system by eliminating all intrastate U.S. Highways less than 300 miles (480 km) in length "as rapidly as the State Highway Department and the Standing Committee on Highways of the American Association of State Highway and Transportation Officials can reach agreement with reference thereto". New additions to the system must serve more than one state and "substantially meet the current AASHTO design standards".[1]
The original major transcontinental routes in 1925, along with the auto trails which they roughly replaced, were as follows:[6]
Note that 10, 60, and 90 only ran about two-thirds of the way across the country, while 11 and 60 ran significantly diagonally. The way in which US 60 violated two of the conventions would prove to be one of the major sticking points; US 60 eventually became the famous U.S. Route 66 in 1926. U.S. Route 101 actually continues east and then south to end at Olympia, Washington.[22] The western terminus of U.S. Route 2 is now at Everett, Washington.[5]
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Main U.S. Routes |
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| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | |
| 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | |
| 40 | 41 | 42 | 43 | 44 | 45 | 46 | 48 | 49 | 50 | 51 | 52 | 53 | 54 | 55 | 56 | 57 | 58 | 59 | |
| 60 | 61 | 62 | 63 | 64 | 65 | 66 | 67 | 68 | 69 | 70 | 71 | 72 | 73 | 74 | 75 | 76 | 77 | 78 | 79 |
| 80 | 81 | 82 | 83 | 84 | 85 | 87 | 89 | 90 | 91 | 92 | 93 | 94 | 95 | 96 | 97 | 98 | 99 | ||
| 101 | 163 | 400 | 412 | 425 | |||||||||||||||
| Lists | U.S. Routes • Bannered • Divided • Bypassed | ||||||||||||||||||
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