Spur route

spursecondaryspurssecondary routespur roadmotorway spurapproach roadauxiliarybranchdouble-spur route
A spur route is a short road forming a branch from a longer, more important road such as a freeway, Interstate Highway, or motorway.wikipedia
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Aomori Expressway

Aomori Expressway (E4A)Aomori ExpresswaysE4A Aomori Expressway
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 the Ōita Airport Road (E97).
The Aomori Expressway is a two-lane national expressway spur route in Aomori, Aomori Prefecture, Japan.

M4 motorway

M4(M4)M4 J33 (Cardiff West)
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 the M4 has one to Heathrow Airport. 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.
Apart from its two spurs—the A48(M) and the M48—the M4 is the only motorway in Wales.

Ōita Airport Road

Ōita Airport Road (E97)
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 the Ōita Airport Road (E97).
From there it briefly travels north to meet its spur route, a route that links it to the Hiji Bypass.

Interstate 580 (California)

Interstate 580I-580580
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.
The heavily traveled spur route of I-80 runs from US 101 in San Rafael in the San Francisco Bay Area to I-5 near Tracy in the Central Valley.

M898 motorway

M898
There are anomalous spur numbers though, for instance the M898 motorway (spur of the M8 motorway; number given to match with 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
It is a spur route from the M8 motorway towards the Erskine Bridge.

Heathrow Airport

London Heathrow AirportHeathrowLondon Heathrow
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 the M4 has one to Heathrow Airport.
A dedicated motorway spur links the terminal to the M25 (between junctions 14 and 15).

A48(M) motorway

A48(M)A48 (M)
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.
It is a 2 mi long, M4 spur.

Gatwick Airport

GatwickLondon Gatwick AirportLondon Gatwick
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 the M4 has one to Heathrow Airport.
The airport is accessible from a motorway spur road at junction 9A of the M23, which links to the main M23 motorway 1 mi east at junction 9.

Great Britain road numbering scheme

A roadA roadsB road
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.
Shorter motorways typically take their numbers from a parent motorway in contravention of the zone system, explaining the apparently anomalous numbers of the M48 and M49 motorways as spurs of the M4, and M271 and M275 motorways as those of the M27.

Interstate 90

I-9090Interstate Highway 90
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.
I-90 is currently the only Interstate having a complete set of nine spur routes (190, 290, 390...890, 990) within one state, in New York.

Road

roadsroad constructionroad building
A spur route is a short road forming a branch from a longer, more important road such as a freeway, Interstate Highway, or motorway.

Controlled-access highway

freewaymotorwayexpressway
A spur route is a short road forming a branch from a longer, more important road such as a freeway, Interstate Highway, or motorway.

Bypass (road)

bypasstruck routebypass route
A bypass or beltway should not be considered a true spur route as it typically reconnects with another or the same major road.

Ring road

beltwayorbital motorwayring roads
A bypass or beltway should not be considered a true spur route as it typically reconnects with another or the same major road.

Dual carriageway

divided highwaydivideddual-carriageway
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 the time (Cootes Drive in Hamilton).

Canada

CanadianCANCanadians
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 the time (Cootes Drive in Hamilton).

Cootes Drive

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 the time (Cootes Drive in Hamilton).

Hamilton, Ontario

HamiltonHamilton, ONCity of Hamilton
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 the time (Cootes Drive in Hamilton).

National Highway (India)

national highwayNational Highwaysland
The Indian National Highway system designates spur routes of the main National Highways with letter suffixes.

National Highway 1A (India, old numbering)

NH 1ANational Highway 1ANational Highway 1A (India)
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 km in length (NH 1C) and the longest is 663 km (NH 1A).

National Highway 1B (India, old numbering)

NH 1B1BNational Highway 1B
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 km in length (NH 1C) and the longest is 663 km (NH 1A).

National Highway 144 (India)

1C144National Highway 1C (India)
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 km in length (NH 1C) and the longest is 663 km (NH 1A).

National Highway 1 (India)

National Highway 1NH 1DNH 1
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 km in length (NH 1C) and the longest is 663 km (NH 1A).

Srinagar

SrinigarSri NagarSrinagar Municipal Corporation
For example, Srinagar, the capital of the state of Jammu and Kashmir, is served by the spur route NH 1A.

Jammu and Kashmir

Jammu & KashmirKashmirJ&K
For example, Srinagar, the capital of the state of Jammu and Kashmir, is served by the spur route NH 1A.