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Great Britain road numbering scheme

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1068: 534: 198: 38: 1023:, which have lower traffic densities than the main trunk roads, or A roads. This classification has nothing to do with the width or quality of the physical road, and B roads can range from dual carriageways to single track roads with passing places. B roads follow the same numbering scheme as A roads, but almost always have 3- and 4-digit designations. Many 3-digit B roads outside the 140:. A classification system was created in 1922, under which important routes connecting large population centres, or for through traffic, were designated as Class I, and roads of lesser importance were designated as Class II. The definitive list of those roads was published on 1 April 1923, following consultations with 391:. In Central London, the A40 (Holborn Viaduct, Holborn, High Holborn and Oxford Street) provides a border between the 4 and 5 zones east of Marble Arch. The original A5 (now renumbered A5183) also provides such a border, and north of St Albans the original A6 (now renumbered A1081) provides an Eastern border. 732:(The A6 originally started in Barnet on the old A1. When the A1 was moved onto the Barnet Bypass in the 1950s, the A6 was cut back to the A1/A1(M) junction (later A1/M25 junction). Further renumbering in the St Albans area means that it now starts in Luton town centre. The old route is numbered as A1081). 156:
With the introduction of motorways in the late 1950s, a new classification of "M" was introduced. In many cases the motorways duplicated existing stretches of A road, which therefore lost much of their significance and were in some cases renumbered. There was no consistent approach to the renumbering
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Shortly after this, the numbers started to appear in road atlases and on signs on the roads themselves, making them a tool for motorists in addition to their use for determining funding. The numbers of the roads changed quite frequently during the early years of the system, because it was a period of
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and identify all roads. Each road is given a single letter (representing a category) and a subsequent number (between one and four digits). Though this scheme was introduced merely to simplify funding allocations, it soon became used on maps and as a method of navigation. There are two sub-schemes in
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The system continues to three and four digit numbers which further split and criss-cross the radials. Lower numbers originate closer to London than higher numbered ones. As roads have been improved since the scheme commenced, some roads with 3 or 4 digit numbers have increased in significance, for
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first came to Britain over three decades after the advent of the A-road numbering event, and as a result required a new numbering system. They were given an M prefix, and in England and Wales a numbering system of their own not coterminous with that of the A-road network, though based on the same
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prefixes but, while these are numbered, in general this is done for use by the local authorities who are responsible for maintaining them and the non-unique numbering is in a local series which usually does not appear on road signs; use of local numbers on signs in England is "not advised".
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Some sections of A roads have been improved to the same standard as motorways, but do not completely replace the existing road; they form a higher standard part of the route for those which are not excluded. These sections retain the same number but are suffixed with (M), for example the
509:, causing some of the roads in Zone 1 to lie in Zone 6. The designated A1 later moved to the western bypass around the city, and roads between the two found themselves back in Zone 1. For the most part the roads affected retained their original numbers throughout. 69:, no E-routes are signposted in the United Kingdom. Due to changes in local road designation, in some cases roads are numbered out of zone. There are also instances where two unrelated roads have been given exactly the same number; for example, the 120:- money raised by taxation to pay for new road construction and for repair of damage done to existing roads by the growing number of motorists. As the Board needed to work out which roads should be funded, upgraded or replaced, its secretary, 152:
gave the Ministry direct control of major routes and a new classification system was created to identify these routes. Originally, those numbers beginning in T were to be made public, but that was eventually deemed unnecessary.
573:, the UK's first motorway section, should have been numbered A6(M) under the scheme decided upon, but it was decided to keep the number M6 as had already been applied. The first full-length motorway in the UK was the 841:
be slightly less important, but may still be classified as trunk routes, although many of these routes have lost a lot of their significance due to motorway bypasses, or the upgrading of other A-roads (such as the
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B roads in the county of Devon have further sub-classifications according to their accessibility. This is due to the rural nature of Devon's topology making some roads unsuitable for certain types of vehicle.
616:(Scottish Government after 1999), the decision was taken to adopt a scheme whereby motorways took the numbers of the all-purpose routes they replaced. As a result, there is no M7 (as no motorway follows the 846:). These routes are not all centred on London, but as far as possible follow the general principle that their number locates them radially clockwise from the associated single digit route. For example, the 1766: 829:
While these routes remain the basis for the numbering of the A road network, they are no longer necessarily major roads, having been bypassed by motorways or other changes to the road network.
471: 1726: 1721: 1716: 1711: 1706: 1701: 1696: 1691: 1686: 1665: 1660: 1655: 1650: 1645: 1640: 1635: 1630: 1625: 1309: 1116: 1111: 1106: 1101: 1096: 1091: 1086: 1081: 1076: 946: 941: 936: 931: 926: 921: 916: 911: 906: 988:. There have been occasions where this designation has been used to indicate motorway bypasses of an existing road, but the original retains the A road designation, for example 897:
is a proposed classification of major local-authority controlled A roads that the government committed to implementing in 2017, with the aim of better targeting road funding.
128:, one of the Board's senior engineers, to devise a classification system and then assign numbers to the highways for identification purposes. The work was interrupted by the 1467: 1166: 136:
was formed in 1919 and given authority to classify highways and to allocate funding for road maintenance, authority for which was granted by section 17 (2) of the
1544: 612:, and applied only in England and Wales. It was decided to reserve the numbers 7, 8 & 9 for Scotland. In Scotland, where roads were the responsibility of the 1756: 1751: 870:(London to Dover), and so on. These roads have been numbered either outwards from or clockwise around their respective hubs, depending on their alignment. 581: 516: 1213:, no road that forms part of this network is signposted as such and only the road's national designation is shown. The same is true in Northern Ireland. 1424: 501:
starts in Zone 3, and is therefore numbered with an A3x number, even though it passes through Zones 4 and 5 to end in Zone 6. Additionally, the A1 in
185:). Occasionally, the new motorway would take the name of the old A road rather than having its own number. The most notable example of that is the 1761: 1573: 649:
In England and Wales, the six single-digit numbers reflect the traditionally most important radial routes coming out of London. Starting with the
528: 59: 1496: 1067: 705:, (Also known as the Great West Road or the Bath Road), although this route is not used as a long-distance road since the completion of the 1787: 1610: 967:, which implies that central government rather than local government has responsibility for them. A more recent classification is that of 485:
The first digit in the number of any road should be the number of the furthest-anticlockwise zone entered by that road. For example, the
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area are former A roads which have been downgraded owing to new road construction; others may link smaller settlements to A roads.
218:. In both cases the main single-digit roads normally define the zone boundaries. The exception is between Zones 1 and 2, where the 169:
in Warwickshire became the A3400 after the M40 was built), and the remainder were downgraded to B or unclassified roads (e.g. the
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In England and Wales the road numbering system for all-purpose (i.e. non-motorway) roads is based on a radial pattern centred on
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Elsewhere when single-digit roads were bypassed, roads were often re-numbered in keeping with the original zone boundaries.
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Shorter motorways typically take their numbers from a parent motorway in contravention of the zone system, explaining the
30: 1210: 105: 66: 971:, the category of recommended routes for long-distance traffic. Primary routes include both trunk and non-trunk roads. 533: 1553: 1039:
The classification is denoted by the colour of the sign border and direction arrow, and can be summarised as follows:
554: 550: 1234: 1341: 93: 426:. Between St Albans and Luton, the original A6 (now renumbered A1081) provides the Western border of the 6-zone. 751: 609: 144:. Government funding towards the repairs of these roads were set at 60% for the former and 50% for the latter. 133: 97: 197: 981: 863: 779: 761: 740: 722: 712: 698: 678: 657: 650: 617: 457: 806: 773: 755: 325: 886:. New routes have also been allocated 3 or 4 digit numbers, for example the Edinburgh City Bypass is the 801:
on 16 May 1935, and later cut back at the southern end because of the construction of the main runway at
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rapid expansion of the network and some numbered routes did not follow the most usual routes taken. The
121: 70: 958: 814: 149: 1593: 1406: 1170: 502: 117: 74: 736:
Similarly, in Scotland, important roads radiating from Edinburgh have single-digit numbers, thus:
1284: 894: 867: 859: 855: 851: 847: 399: 315: 166: 1363: 116:
Work on classification began in 1913. The Road Board had been established in 1909 to administer
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prefixes for Cycle Superhighways, marked using magenta signs, but these are being phased out.
802: 794: 747: 729: 141: 37: 1005: 993: 985: 419: 372: 267: 50: 653:
which heads due north, numbers were allocated sequentially in a clockwise direction, thus:
1001: 843: 818: 629: 613: 453: 407: 341: 337: 178: 129: 101: 429:
Zone 7: North of the Solway Firth/Eden Estuary, west of the A7, south of the A8 covering
17: 1149:
Exceptions to this are known in the forms of numbers on signs and past use of prefixes
1020: 798: 672: 570: 411: 376: 321: 285: 263: 239: 231: 54: 1781: 1158: 968: 601: 597: 461: 311: 259: 255: 125: 46: 810: 633: 605: 589: 585: 438: 364: 360: 281: 271: 247: 227: 219: 162: 1517: 1046:- roads suitable for cars, minibuses and light goods vehicles - but NOT caravans 964: 706: 668: 667:, (Also known as the Great North Road), but most of the road is bypassed by the 574: 566: 562: 558: 546: 506: 446: 368: 345: 329: 243: 174: 1522: 1449: 1173:, including the creation of a new vehicular access onto a highway. The letter 879: 692: 593: 490: 395: 388: 349: 307: 1512: 569:
numbers were reserved for the other two planned long distance motorways. The
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has moved twice. Originally along the Great North Road, it then moved to the
157:– some A roads retained their existing number as non-primary roads (e.g. the 887: 883: 875: 790: 786: 743: 702: 664: 541: 498: 403: 353: 303: 275: 251: 215: 850:(London to King's Lynn) is the first main route clockwise from the A1, the 765: 716: 625: 621: 486: 479: 434: 423: 380: 170: 158: 85: 837:
These radials are supplemented by two-digit codes which are routes that
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on top of it. As such, the route from Edinburgh is now replaced by the
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Zone 3: North/West of the A3, south of the A4 covering part of Surrey,
81: 685:, (The southern part of Watling Street, also known as the Dover Road). 1468:"DfT - Guidance on Road Classification and the Primary Route Network" 1024: 997: 822: 660: 494: 475: 293: 289: 211: 182: 1132:
Roads and lanes with yet lower traffic densities are designated as
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Zone 8: North of the A8, west of the A9 covering northern Glasgow,
1425:"Proposals for the Creation of a Major Road Network: Consultation" 1066: 772:, now has a 25-mile (40 km) gap, where it is replaced by the 725: 682: 532: 235: 196: 186: 89: 36: 1364:"List of Class I and Class II Roads and Numbers (transcription)" 1209:
Despite numerous large roads in Great Britain being part of the
1178: 467: 297: 1526: 1052:- roads that are only suitable for cars and other light traffic 394:
Zone 6: East of the A6 and A7, west of the A1 covering eastern
1407:"Sandbox: 1920s Renumbering - Roader's Digest: The SABRE Wiki" 1197:
prefix and marked using pale green signs. There are also some
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the zones were defined for Zones 1 to 4 based on the proposed
608:. This numbering system was devised in 1958–59 by the then 359:
Zone 5: North/East of the A5, west of the A6, south of the
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Zone 4: North of the A4, south/west of the A5 covering the
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While some of Great Britain's major roads form part of the
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Just Taxes: The Politics of Taxation in Britain, 1914–1979
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This sign at Crouch Hill shows two road numbers in Zone 2.
165:), others were given "less significant" numbers (e.g. the 1315:. Department for Transport. 5 August 2005. Archived from 92:; a separate system using similar conventions is used in 222:
defines the boundary so that all of Kent is in Zone 2.
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The numbering zones for A & B roads in Great Britain
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HMSO and National Archives files MT39/241 and MT39/246
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Pathetic Motorways – How the motorways were numbered
1744: 1679: 1618: 1609: 1560: 1262:. Newcastle: Red Kite Prayer/Front Page Creations. 1177:is used for many important unclassified roads in 862:(London to Shoeburyness); the next radial is the 466:Zone 9: North of the A8, east of the A9 covering 545:principle of zones. Running clockwise from the 96:, as well as outside the United Kingdom in the 1538: 1487:Bancroft, Peter; Andrew Emmerson (May 2007). 8: 214:. In Scotland the same scheme is centred on 1071:C road sign in Ribblesdale, North Yorkshire 821:). On 1 April 1997, the A9 was diverted to 1615: 1545: 1531: 1523: 1058:- roads recommended for local traffic only 854:(London to Norwich) is the next, then the 537:Motorway number zones of England and Wales 1342:"History of roads and National Highways" 671:and many sections have been upgraded to 610:Ministry of Transport and Civil Aviation 1221: 719:, (The Northern part of Watling Street) 529:List of motorways in the United Kingdom 1489:A, B, C and M: Road Numbering Revealed 62:, and another for non-motorway roads. 1163:main roads have a regular grid system 768:, which formerly linked Edinburgh to 695:, (Also known as the Portsmouth Road) 7: 1165:. These designations are used when 758:motorways now form the primary link. 632:, the short M85 became part of the 1381:Porter, John; Bridle, Ron (2002). 1344:. National Highways. 15 April 2020 825:and Scrabster at the northern end. 284:, east of the A3 covering most of 230:, east of the A1 covering much of 25: 1491:. Capital Transport Publishing. 1285:"Road numbers: how it happened" 1385:. Thomas Telford. p. 27. 1310:"FOI Request – Road numbering" 953:Trunk roads and primary routes 858:(London to Lowestoft) and the 138:Ministry of Transport Act 1919 132:. It did not resume until the 1: 1518:roads.org.uk - Road Numbering 1260:Roads Were Not Built For Cars 624:was re-routed to replace the 31:Odonymy in the United Kingdom 1211:International E-road network 963:Some A roads are designated 582:apparently anomalous numbers 173:, which was replaced by the 106:British Overseas Territories 80:This scheme applies only to 67:international E-road network 1788:Roads in the United Kingdom 1554:Roads in the United Kingdom 1804: 1752:Anomalously numbered roads 1430:. Department for Transport 1235:Cambridge University Press 1229:Daunton, Martin J (2002). 956: 789:. Originally Edinburgh to 604:motorways as those of the 526: 77:are both designated A594. 28: 793:, the A9 was extended to 1599:Gaelic-speaking Scotland 1567:Road numbering schemes: 1383:The Motorway Achievement 18:B roads in Great Britain 1411:www.sabre-roads.org.uk 1258:Reid, Carlton (2014). 1072: 538: 202: 161:running alongside the 42: 1171:planning applications 1136:roads commonly using 1123:Other classifications 1070: 817:as an alternative to 536: 431:Dumfries and Galloway 280:Zone 2: South of the 226:Zone 1: North of the 200: 134:Ministry of Transport 122:William Rees Jeffreys 40: 1767:Primary destinations 959:Trunk roads in Wales 815:Queensferry Crossing 645:Single-digit A roads 517:anomalously numbered 150:Trunk Roads Act 1936 503:Newcastle upon Tyne 472:North East Scotland 118:Vehicle Excise Duty 71:Leicester Ring Road 1169:deal with certain 1128:Unclassified roads 1073: 895:Major Road Network 866:, followed by the 539: 400:North East England 316:South West England 203: 43: 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Maybury 123: 119: 111: 109: 107: 103: 99: 95: 91: 87: 83: 78: 76: 72: 68: 63: 61: 58:use: one for 56: 52: 49:, there is a 48: 47:Great Britain 39: 35: 32: 27: 19: 1680:B-road lists 1619:A-road lists 1568: 1488: 1462: 1453: 1444: 1432:. Retrieved 1419: 1410: 1401: 1382: 1376: 1367: 1358: 1346:. Retrieved 1336: 1324:. Retrieved 1317:the original 1304: 1292:. Retrieved 1289:Roads.org.uk 1288: 1279: 1259: 1253: 1230: 1224: 1208: 1198: 1194: 1188: 1174: 1157:on signs in 1154: 1150: 1145: 1141: 1137: 1134:unclassified 1133: 1131: 1055: 1049: 1043: 1038: 1034: 1016: 1015: 978: 962: 892: 874:example the 872: 838: 836: 828: 735: 648: 579: 559:M4 motorways 540: 514: 511: 484: 441:, including 387:and western 365:Eden Estuary 361:Solway Firth 286:South London 272:East Lothian 248:Lincolnshire 232:North London 220:River Thames 209: 206:Non-motorway 155: 146: 124:, appointed 115: 79: 64: 44: 34: 26: 1745:Other lists 1348:23 December 1326:27 December 1233:. England: 1189:In London, 965:trunk roads 813:across the 575:M1 motorway 507:Tyne Tunnel 369:North Wales 330:Oxfordshire 306:(excluding 250:, parts of 244:East Anglia 98:Isle of Man 1589:Road signs 1434:5 February 1217:References 957:See also: 809:(with the 715:London to 701:London to 693:Portsmouth 691:London to 681:London to 491:trunk road 418:, and the 410:, eastern 396:Lancashire 389:Lancashire 375:, western 308:Portsmouth 288:, part of 29:See also: 1762:Motorways 1757:Junctions 1191:Cycleways 1185:Cycleways 791:Inverness 787:Scrabster 744:Edinburgh 703:Avonmouth 665:Edinburgh 628:south of 542:Motorways 523:Motorways 499:Mansfield 404:Yorkshire 367:covering 354:Mid Wales 304:Hampshire 276:Edinburgh 252:Yorkshire 216:Edinburgh 60:motorways 1782:Category 1561:Articles 1294:18 March 766:Greenock 748:Carlisle 730:Carlisle 717:Holyhead 487:A38 road 480:Shetland 460:and the 458:Highland 435:Ayrshire 424:Lothians 381:Cheshire 373:Midlands 371:, North 179:Tiverton 177:between 86:Scotland 55:classify 53:used to 1584:Odonymy 1579:Driving 1205:E-roads 1017:B roads 1012:B roads 1006:A627(M) 994:A329(M) 986:A404(M) 844:A38 (M) 783:Falkirk 770:Glasgow 640:A roads 584:of the 443:Glasgow 416:Rutland 385:Cumbria 334:Bristol 310:), the 112:History 82:England 1495:  1389:  1266:  1241:  1161:where 1025:London 1002:A48(M) 998:A38(M) 823:Thurso 661:London 561:. The 495:Bodmin 476:Orkney 294:Sussex 290:Surrey 282:Thames 228:Thames 212:London 183:Exeter 1611:Zones 1594:Wales 1471:(PDF) 1428:(PDF) 1320:(PDF) 1313:(PDF) 1274:p.30. 1056:White 1050:Brown 990:A3(M) 982:A1(M) 880:A1079 819:Perth 726:Luton 683:Dover 673:A1(M) 630:Perth 594:spurs 447:Clyde 346:south 322:south 236:Essex 187:A1(M) 90:Wales 1493:ISBN 1436:2018 1387:ISBN 1350:2022 1328:2007 1296:2022 1264:ISBN 1239:ISBN 1179:Fife 1153:and 1144:and 1044:Blue 1004:and 984:and 893:The 888:A720 884:A414 882:and 876:A127 799:Wick 797:via 754:and 602:M275 600:and 598:M271 588:and 565:and 557:and 489:, a 478:and 468:Fife 437:and 422:and 414:and 352:and 350:west 344:and 324:and 314:and 298:Kent 296:and 181:and 104:and 88:and 73:and 868:A20 860:A13 856:A12 852:A11 848:A10 839:may 811:M90 785:to 752:M74 746:to 728:to 663:to 634:M90 626:A85 622:A90 606:M27 590:M49 586:M48 497:to 171:A38 167:A34 163:M40 159:A40 45:In 1784:: 1452:. 1409:. 1366:. 1287:. 1237:. 1199:CS 1181:. 1140:, 1008:. 1000:, 996:, 992:, 890:. 878:, 864:A2 807:M9 780:A9 774:M8 762:A8 756:M8 741:A7 723:A6 713:A5 707:M4 699:A4 689:A3 679:A2 669:M1 658:A1 651:A1 636:. 618:A7 577:. 567:M6 563:M5 555:M3 553:, 551:M2 547:M1 519:. 474:, 470:, 456:, 433:, 406:, 402:, 398:, 383:, 379:, 348:, 340:, 336:, 332:, 328:, 292:, 270:, 262:, 258:, 254:, 246:, 242:, 238:, 234:, 189:. 175:M5 108:. 100:, 84:, 1727:9 1722:8 1717:7 1712:6 1707:5 1702:4 1697:3 1692:2 1687:1 1666:9 1661:8 1656:7 1651:6 1646:5 1641:4 1636:3 1631:2 1626:1 1546:e 1539:t 1532:v 1501:. 1473:. 1456:. 1438:. 1413:. 1395:. 1370:. 1352:. 1330:. 1298:. 1272:. 1247:. 1195:C 1175:Q 1155:V 1151:H 1146:U 1142:D 1138:C 776:. 709:. 675:. 449:. 363:/ 356:. 20:)

Index

B roads in Great Britain
Odonymy in the United Kingdom

Great Britain
numbering scheme
classify
motorways
international E-road network
Leicester Ring Road
a road in Cumbria
England
Scotland
Wales
Northern Ireland
Isle of Man
Roads in Jersey
British Overseas Territories
Vehicle Excise Duty
William Rees Jeffreys
Henry Maybury
First World War
Ministry of Transport
Ministry of Transport Act 1919
local authorities
Trunk Roads Act 1936
A40
M40
A34
A38
M5

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