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26-452: Interstate 115 ( I-115 ) is a 1.194-mile-long (1.922 km) auxiliary Interstate Highway which connects I-15 / I-90 to Butte in the U.S. state of Montana . The highway is concurrent with I-15 Bus. / I-90 Bus. for its entire length. The highway travels from an incomplete interchange with I-15/I-90 through generally rural areas in western Butte. It also has an interchange with Excelsior Avenue before terminating. The entire route

52-730: A "family" of routes with the "parent" route lacking the added "A". Examples of spur routes in the system include the Aomori Expressway (E4A) , linking the Tōhoku Expressway (E4) to the eastern limits of Aomori , and the Sasson Expressway (E5A) , linking the Dō-Ō Expressway (E5) to Otaru ; however, some expressways that lack the "A" designation could also be considered spurs, such as the Kansai-Kūkō Expressway (E71) or

78-553: A city or bypassing it and then reconnecting to a major highway would receive an even first digit, and be considered a loop rather than a spur. For example, in the case of Interstate 5 , Interstate 105 is a spur route ending at Los Angeles International Airport , whereas Interstate 405 begins and ends at Interstate 5 , bypassing downtown Los Angeles . Spurs are also found branching from US highways , state routes , and county routes , often as extended onramps and offramps of expressways . There are many numbering violations in

104-587: A freeway along the modern-day I-115 corridor was proposed in the 1950s. The 1955 General Location of National System of Interstate Highways , an early platform for what would become the Interstate Highway System, contained an inset of the proposed freeways in and around the city of Butte including an east–west freeway spur on the west side of the community. Designated as part of the Interstate Highway System around 1957, I-115's construction

130-498: A large median. Approximately one mile (1.6 km) from I-15/I-90, I-115 has its only interchange at Excelsior Avenue, which can be used to access the town of Walkerville . Excelsior Avenue is the only numbered exit along I-115, and the structure of the interchange directs motorists to stop and yield signs, as opposed to traffic signals for most exits in urban areas. I-115 ends at the overpass over Excelsior Avenue. It continues into Butte as I-15 Bus. / I-90 Bus . The development of

156-492: A main highway is routed around a town and away from its former alignment. The designation of "C" was used twice (Highway 3C and 40C), and is assumed to mean "Connector". Both highways have long since been retired and are now county roads . There was also one road with the D designation (Highway 8D, later the original Highway 102), and this may have stood for "Diversion", as it was along the first completed divided highway in Canada at

182-445: A place where the highway mileage resets to zero. Beltways are also preceded by an even number in the first digit. Some examples of beltways include: Spur route In the province of Ontario, most spur routes are designated as A or B, such as Highway 17A, or 7B. A stands for "Alternate Route", and usually links a highway to a town's central core or main attraction, while B stands for "Business Route" or "Bypass", but are used when

208-544: A relatively short spur route that connects an autostrada (Italian for motorway ) to a nearby city or tourist resort not directly served by the motorway. These spurs are owned and managed by Anas . Some spurs are toll-free motorways (type-A), but most are type-B or type-C roads. All RA have separate carriageways with two lanes in each direction. Generally, they do not have an emergency lane. In Japan, spurs of its expressways are usually designated with an added letter "A". This designation applies to all routes that are part of

234-458: A state. There are three states that have no auxiliary Interstate Highways: Alaska, Arizona, and New Mexico. North Dakota has an auxiliary route, but it is unsigned , and Wyoming's does not meet Interstate Highway standards. Auxiliary Interstates are divided into three types: spur , loop , and bypass routes. The first digit of the three digits usually signifies whether a route is a bypass, spur, or beltway. The last two digits are derived from

260-433: A three-digit number. The last two digits of the number are the number of the "parent" Interstate ( Interstate 238 , which connects Interstate 880 with Interstate 580 near Hayward, CA, is the only exception to this); e.g. a spur route of Interstate 90 could be 990; a spur route of Interstate 5 could be 105. Spur Interstate routes have three-digit numbers with an odd first digit. A subsidiary route either passing through

286-552: A unique A-number road) and the unique case of the M181 motorway , a spur of a spur M180 motorway , and that of the M18 motorway A-road spurs do not follow a noticeable numbering system; they would be impossible to assign due to the quantity of A-road numbers in use. In the US, many Interstate Highways have spur routes when they enter a large metropolitan area. Interstate spur routes are numbered with

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312-771: The Brașov . In the UK , a spur route carries the same definition, but the numbering rules differ. Short spurs from primary roads or motorways typically are not given a unique number, and three arms of the junction will apparently have the same number. For example, the A14 has a same-number spur to the A1(M) motorway at Huntingdon in Cambridgeshire , the M23 motorway has one to Gatwick Airport in West Sussex and

338-515: The M4 has one to Heathrow Airport . To distinguish the spur on road signs, the road it leads to is usually given - for example "Gatwick Airport ( A23 )". Typically, slightly longer spurs, or those with intermediate junctions of their own, are given unique numbers to distinguish them from their parent road, for example, the A48(M) motorway , a spur of the M4 . There is a loose numbering system for these spurs on

364-582: The Ōita Airport Road (E97) . In New Zealand, spurs on state highways are usually designated with an added letter. Examples include SH 2B , linking SH 2 to Napier Airport, and SH 6A , linking SH 6 with Queenstown town center. Not all such alphabetic suffixes refer to spurs, however; ring roads and linking roads between highways are also so designated. Conversely, some State Highways could themselves be considered spurs, notably SH 78 , New Zealand's shortest state highway, which links SH 1 in Timaru city center with

390-573: The Port of Timaru. Such spurs and spur roads leading from smaller urban thoroughfares to individual facilities are often referred to in New Zealand as "feeder roads". All national roads, local roads and county roads have spur routes. A good example is DN1 and DN1A . DN1A goes from Bucharest to Brașov via Buftea , and have an intersection with DN1 at Ploiești . After Ploiești , DN1A goes to Vălenii de Munte, Cheia, and then DN1A goes directly onto

416-550: The main Interstate Highway. For instance, I-115 contains an odd number in the first digit (1), which indicates that this freeway is a spur. The last two digits signify the highway's origin. In this case, the "15" in I-115 shows that it is a supplement to I-15 . Exceptions to the standard numbering guidelines exist for a number of reasons. In some cases, original routes were changed, extended, or abandoned, leaving discrepancies in

442-713: The motorway network, not dissimilar to the US system – the road takes a three-digit number derived from that of the parent road. Examples include the M602 motorway (spur of the M60 and M62 motorways), M621 motorway (spur of the M62 and M1 motorways), and M271 motorway (spur of the M27 motorway ). There are anomalous spur numbers though, for instance the M898 motorway (spur of the M8 motorway ; number given to match with

468-543: The parent National Highway, they are not merely secondary in status as some of the spur routes serve important cities in India. For example, Srinagar , the capital of the state of Jammu and Kashmir , is served by the spur route NH 1A. Some spur routes are specifically used to connect important Indian ports : NH 5A links Paradip with its parent NH 5 and NH 7A links Tuticorin with NH 7 ). The acronym RA stands for Raccordo autostradale (translated as "motorway connection"),

494-542: The parent route at one end; bypasses , which connect to the parent route at both ends; and beltways , which form a circle that intersects the parent route at two locations. Some routes connect to the parent route at one end but to another route at the other end; some states treat these as spurs while others treat them as bypasses. Like the primary Interstate Highways , auxiliary highways meet Interstate Highway standards (with rare exceptions ). The shorter auxiliary routes branch from primary routes; their numbers are based on

520-489: The parent route's number. All of the supplement routes for Interstate 95 (I-95) are designated with a three-digit number ending in "95": I-x95. With some exceptions, spur routes are numbered with an odd hundreds digit (such as I-395 ), while bypasses and beltways are numbered with an even hundreds digit (such as I-695 ). Because longer Interstates may have many such supplemental routes, the numbers can repeat from state to state along their route, but they will not repeat within

546-415: The same Interstate, some states treat these as bypasses while others treat these as spurs—see Spur route above. A beltway (also known as a loop route ) completely surrounds a metropolitan city, and it is often connected with multiple junctions to other routes. Unlike other auxiliary Interstate Highways (and by extension, all primary Interstate Highways ), beltways do not have termini; however, they have

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572-516: The system. In other cases, it may not be possible to use the proper number because the limited set of available numbers has been exhausted, causing a "non-standard" number to be used. A spur route 's number usually has an odd number for its first digit. It is usually one of the following: Examples include: Sometimes, a three-digit Interstate Highway branches off from another three-digit Interstate Highway. These spurs do not connect directly with their parent highways, but are associated with them via

598-472: The three-digit highways they do intersect with. Examples include: A bypass route may traverse around a city, or may run through it with the mainline bypassing. In a typical 3-digit Interstate Highway, bypasses usually have both its two termini junctioned with another Interstate highway. Bypass routes are preceded by an even number in the first digit. Examples include: In the case of an auxiliary Interstate highway which has both ends at Interstates but not

624-539: The time ( Cootes Drive in Hamilton ). The Indian National Highway system designates spur routes of the main National Highways with letter suffixes. For example, National Highway 1 has four spur routes: NH 1A , NH 1B , NH 1C , and NH 1D , the shortest of which is just 6 kilometres (3.7 mi) in length (NH 1C) and the longest is 663 kilometres (412 mi) (NH 1A). While the spur routes essentially originate at

650-408: Was built to Interstate standards during the 1960s, and was further changed in 2005. I-115 begins at an interchange with I-15 / I-90 . As a four-lane highway with two lanes in each direction, I-115 heads east into downtown Butte . Before reaching exit 1, eastbound traffic makes a curve while westbound traffic goes to I-15/I-90 without making such a curve, therefore, that portion of I-115 contains

676-508: Was funded by the federal government. The entire route is in Butte , Silver Bow County . List of auxiliary Interstate Highways Auxiliary Interstate Highways (also called three-digit Interstate Highways ) are a subset of highways within the United States' Interstate Highway System . The 323 auxiliary routes generally fall into three types: spur routes , which connect to or intersect

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