Knowledge

Grade separation

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on-slip. This is as a result of the slip roads on the west side of the junction connecting to the roundabout on the inside of the eastern arc rather than the outside of the western arc as is normal. The two slip-roads are connected by a single lane on the inside of the roundabout, which traffic wishing to use the Westbound on-slip must join, and traffic from the Eastbound off-slip must leave.
720:(called underpasses in North America as well as in the United Kingdom when referring to roads) may be employed to allow pedestrians and cyclists to cross busy or fast streets. They are often used over and under motorways since at grade pedestrian crossings are generally not permitted. Same can be said for railways. Though introduced to 485:
Where junctions have unusual designs weaving can be a problem other than on the main road. An example of this can be found at Junction 7 of the M6, where traffic joining the roundabout from the M6 Eastbound off-slip must weave with the traffic already on the roundabout wishing to use the M6 Westbound
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is a result of placing an exit ramp a short distance after an entry ramp, causing conflicts between traffic attempting to leave the roadway at the next junction and traffic attempting to enter from the previous junction. This situation is most prevalent either where the junction designer has placed
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Grade-separated road junctions are typically space-intensive, complicated, and costly, due to the need for large physical structures such as tunnels, ramps, and bridges. Their height can be obtrusive, and this, combined with the large traffic volumes that grade-separated roads attract, tend to make
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Rail-over-rail grade separations take up less space than road grade separations: because shoulders are not needed, there are generally fewer branches and side road connections to accommodate (because a partial grade separation will accomplish more improvement than for a road), and because at-grade
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Grade-separated pedestrian and cycling routes often require modest space since they do not typically intersect with the facility (such as a highway) that they cross. However, grade-separated pedestrian crossings with steps introduce accessibility problems. Some crossings have
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are chosen to be grade separated, through their entire length or for part of it. Grade separation drastically increases the capacity of a road compared to an identical road with at-grade junctions. For instance, it is extremely uncommon to find an at-grade junction on a
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Compact grade-separation, whereby the two roads are linked by a compact "connector road", with major-minor priority junctions at each of its ends; usually a variant of the cloverleaf type interchange, but only involving two quadrants rather than
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Attempts have been made to increase the capacity of railways by making tracks cross in a grade-separated manner, as opposed to the traditional use of flat crossings to change tracks. A grade-separated rail interchange is known as a
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These junctions connect two roads, but only one is fully grade-separated, i.e. traffic on one road does not have to stop at yield lines or signals on one road, but may have to do so when switching to the other:
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An example of weaving, where traffic drives on the left. The blue car entering the grade-separated road, and both the red and blue car exiting must both change lanes in the short distance provided.
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south of Basingstoke to allow traffic on the Salisbury and Southampton routes to converge without conflicting movements; this became known as "Battledown Flyover". Also in Britain, the
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railway connections often take up significant space on their own. However, they require significant engineering effort, and are very expensive and time-consuming to construct.
520:. This greatly improves safety and is crucial to the safe operation of high-speed lines. The construction of new level crossings is generally not permitted, especially for 524:
lines and level crossings are increasingly less common due to the increase of both road and rail traffic. Efforts to remove level crossings are done in the UK by
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Grade-separated roads that permit for higher speed limits can actually reduce safety due to 'weaving' (see below) as well as a perceived sense of safety.
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them unpopular to nearby landowners and residents. For these reasons, proposals for new grade-separated roads can receive significant public opposition.
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on other transit routes when they cross each other. The composition of such transport axes does not have to be uniform; it can consist of a mixture of
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Roads with grade separation generally allow traffic to move freely, with fewer interruptions, and at higher overall speeds; this is why
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in which the direct flow of traffic on one or more of the roads is not disrupted. Instead of a direct connection, traffic must use
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If traffic can traverse the junction from any direction without being forced to come to a halt, then the junction is described as
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are typically higher for grade-separated roads. In addition, reducing the complexity of traffic movements reduces the risk of
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The concept of grade separation includes all transport modes, such as a simple pedestrian bridge over rail tracks.
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in New York City in the 1860s, subways are far more common today in Europe, especially in countries such as the
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lines, the faster speed requires grade separation. Therefore, many high speed lines are elevated, especially in
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of two or more surface transport axes at different heights (grades) so that they will not disrupt the
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and other regions using the same gauge, the most complicated grade-separation railpoint is found at
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later made extensive use of flying junctions on other parts of its busy former LSWR main line.
455: 368: 129:), or a combination of both can be built at a junction to achieve the needed grade separation. 24: 2174: 1895: 1511: 1402: 1002: 647: 544: 321: 150: 516:
by making any roads or footpaths crossing the line either pass under or over the railway on
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Today in Britain, the tightly grouped nest of flying junctions to the north of
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the on-slip to the road before the off-slip at a junction (for example, the
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was completed in 1913. The most frequent use was later found on the former
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An example of the potential complexity of grade separation, seen in the
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In railway construction, grade separation also means the avoidance of
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In North America, a grade-separated junction may be referred to as a
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Dual carriageway / Divided highway / Expressway
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Virtually all major railway lines no longer cross (forming an
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or braided ramps to separate entering and exiting traffic.
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High-speed railways (200 km/h or 120 mph+)
650:main lines. The lines are included as part of the 2330: 630:In the United States, a flying junction on the 449:On roadways with grade-separated interchanges, 816: 224:The term is most widely applied to describe a 926: 662:. The most complex of these junctions, near 776:Nineteenth-century pedestrian underpass in 732:where cycling is strongly encouraged. Long 501: 933: 919: 708: 208:, but these can be time-consuming to use. 823:ENGINEERING HANDBOOK, Second Edition 1950 585:(LSWR) made use of a flying junction at 440: 340: 307: 64: 52: 33: 18: 2331: 666:, handles railway traffic for Amtrak, 400: 345:4 level stack interchange between the 338:These junctions connect two freeways: 2029:Median / Central reservation 914: 798:City of Eureka Municipal Code 71.85 489:Weaving can be alleviated by using 474:, the M6/M5 junction north-west of 13: 1947:Risk compensation (road transport) 940: 848:Texas Department of Transportation 558: 333: 14: 2350: 478:, and the A4/M5 junction west of 166:, which are not grade-separated. 2313:Glossary of road transport terms 880:Reducing risk at level crossings 769: 745: 598:Clapham Junction railway station 583:London and South Western Railway 472:M25, the London orbital motorway 290:; it is all but impossible on a 190: 387:Turbine (whirlpool) interchange 889: 873: 840: 810: 791: 534:Level Crossing Removal Project 421:Single-point urban interchange 416:Partial cloverleaf interchange 57:Rail-rail grade separation in 1: 2295:Pavement performance modeling 2285:International roughness index 784: 324:- a type of grade separation. 174: 2290:Present serviceability index 2084:Sidewalk / Pavement 1629:Diamond grinding of pavement 7: 2262:Underpass / Tunnel 2257:Overpass / Flyover 2011:High-occupancy vehicle lane 1901:Driving under the influence 975:Freeway / Motorway 764:was built for pedestrians. 496: 491:collector/distributor roads 219: 10: 2355: 1189:Highway systems by country 562: 505: 436: 169: 85:is a method of aligning a 2308: 2300:Granular base equivalency 2270: 2241: 2147: 2119:Traffic signal preemption 1964: 1924: 1886: 1728: 1717: 1569: 1527:Right-in/right-out (RIRO) 1456: 1433:Single-point urban (SPUI) 1373: 1364: 1292: 1197: 1111: 993: 960: 951: 294:, though a few do exist. 121:, also called flyovers), 2280:Pavement condition index 2006:High-occupancy toll lane 2001:Contraflow lane reversal 1976:Barrier transfer machine 502:With roads and footpaths 393:Various incarnations of 328: 214: 42:for grade separation in 1134:Express-collector setup 856:TxDOT Visual Dictionary 817:Henry K. Evans (1950). 709:Footbridges and subways 574:and one which is not a 378:Cloverstack interchange 292:U.S. Interstate Highway 2318:Road types by features 2213:Raised pavement marker 2180:Constant-slope barrier 2104:Traffic directionality 2094:Street running railway 1517:Protected intersection 886:. Accessed 27 May 2024 456:cloverleaf interchange 446: 369:Cloverleaf interchange 358: 325: 142:– in contrast with an 70: 62: 50: 31: 25:Jane Byrne Interchange 2175:Concrete step barrier 1512:Offset T-intersection 693:, which includes the 648:Pennsylvania Railroad 545:Great Central Railway 444: 344: 322:Leipzig-Halle Airport 311: 299:fully grade separated 68: 56: 37: 22: 16:Type of road junction 2218:Road surface marking 1916:Single-vehicle crash 1639:Full depth recycling 1537:Seagull intersection 689:In what is known as 390:Windmill interchange 2044:Pedestrian crossing 1607:Reinforced concrete 1443:Three-level diamond 1154:Two-lane expressway 1139:Farm-to-market road 695:former Soviet Union 411:Diamond interchange 401:Partially separated 374:Trumpet interchange 79:highway engineering 77:(more specifically 2074:Runaway truck ramp 1896:Driver's education 1684:Rubberized asphalt 1619:Crocodile cracking 1542:Split intersection 1310:Hierarchy of roads 1271:Single carriageway 901:2011-02-23 at the 803:2012-02-12 at the 680:CSX Transportation 672:New Jersey Transit 652:Northeast Corridor 617:high-speed railway 522:high speed railway 447: 395:spaghetti junction 384:Semi-directional T 359: 326: 71: 63: 51: 32: 2326: 2325: 2134:Wide outside lane 1960: 1959: 1937:Automotive safety 1818:Road slipperiness 1565: 1564: 1413:Diverging diamond 1360: 1359: 1276:Single-track road 1218:Bicycle boulevard 656:Keystone Corridor 632:Nickel Plate Road 363:Stack interchange 283:dual carriageways 269:Typically, large 75:civil engineering 2346: 2170:Cat's eye (road) 1991:Complete streets 1763:Dead Man's Curve 1726: 1725: 1664:Pavement milling 1579:Asphalt concrete 1522:Quadrant roadway 1463: 1385: 1371: 1370: 1337:Street hierarchy 985:Elevated highway 958: 957: 935: 928: 921: 912: 911: 905: 893: 887: 877: 871: 870: 868: 867: 858:. Archived from 844: 838: 837: 835: 834: 814: 808: 807:(California, US) 795: 773: 749: 676:Norfolk Southern 664:Philadelphia Zoo 591:Southern Railway 587:Worting Junction 541:London Extension 288:British motorway 157:diamond crossing 134:grade separation 83:grade separation 2354: 2353: 2349: 2348: 2347: 2345: 2344: 2343: 2329: 2328: 2327: 2322: 2304: 2272: 2266: 2237: 2228:Traffic barrier 2188:F-Shape barrier 2143: 2099:Traffic calming 2059:Reversible lane 2049:Pedestrian zone 2034:Motorcycle lane 1996:Contraflow lane 1968:time allocation 1967: 1956: 1952:Underride guard 1920: 1882: 1768:Expansion joint 1730: 1720: 1713: 1699:Stamped asphalt 1561: 1492:Continuous flow 1465: 1461: 1460: 1452: 1386: 1382:grade-separated 1379: 1378: 1356: 1315:Private highway 1288: 1193: 1107: 989: 947: 939: 909: 908: 903:Wayback Machine 894: 890: 878: 874: 865: 863: 845: 841: 832: 830: 815: 811: 805:Wayback Machine 796: 792: 787: 780: 774: 765: 750: 711: 613: 572:flying junction 567: 565:Flying junction 561: 559:Flying junction 532:as part of the 514:level crossings 510: 504: 499: 439: 403: 353:(above) in the 336: 334:Fully separated 331: 264:grade separated 222: 217: 193: 177: 172: 17: 12: 11: 5: 2352: 2342: 2341: 2339:Junction types 2324: 2323: 2321: 2320: 2315: 2309: 2306: 2305: 2303: 2302: 2297: 2292: 2287: 2282: 2276: 2274: 2268: 2267: 2265: 2264: 2259: 2254: 2249: 2245: 2243: 2239: 2238: 2236: 2235: 2230: 2225: 2220: 2215: 2210: 2205: 2200: 2198:Jersey barrier 2195: 2190: 2185: 2182: 2177: 2172: 2167: 2162: 2157: 2151: 2149: 2145: 2144: 2142: 2141: 2136: 2131: 2129:Unused highway 2126: 2121: 2116: 2111: 2109:Traffic island 2106: 2101: 2096: 2091: 2086: 2081: 2076: 2071: 2066: 2061: 2056: 2051: 2046: 2041: 2036: 2031: 2026: 2021: 2016: 2013: 2008: 2003: 1998: 1993: 1988: 1983: 1978: 1972: 1970: 1962: 1961: 1958: 1957: 1955: 1954: 1949: 1944: 1939: 1934: 1928: 1926: 1922: 1921: 1919: 1918: 1913: 1908: 1906:Drowsy driving 1903: 1898: 1892: 1890: 1884: 1883: 1881: 1880: 1875: 1870: 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1525: 1523: 1520: 1518: 1515: 1513: 1510: 1508: 1507:Michigan left 1505: 1503: 1500: 1498: 1495: 1493: 1490: 1488: 1485: 1483: 1480: 1478: 1475: 1473: 1470: 1469: 1467: 1464: 1459:Intersections 1455: 1449: 1446: 1444: 1441: 1439: 1436: 1434: 1431: 1429: 1426: 1424: 1421: 1419: 1416: 1414: 1411: 1409: 1408:Directional T 1406: 1404: 1401: 1399: 1396: 1394: 1391: 1390: 1388: 1383: 1377: 1372: 1369: 1367: 1363: 1353: 1350: 1348: 1345: 1343: 1340: 1338: 1335: 1331: 1328: 1326: 1325:special route 1323: 1322: 1321: 1318: 1316: 1313: 1311: 1308: 1306: 1303: 1301: 1298: 1297: 1295: 1291: 1285: 1282: 1279: 1277: 1274: 1272: 1269: 1267: 1264: 1261: 1259: 1256: 1254: 1251: 1249: 1246: 1244: 1243:Frontage road 1241: 1239: 1236: 1234: 1231: 1229: 1226: 1224: 1221: 1219: 1216: 1214: 1211: 1209: 1206: 1203: 1202: 1200: 1196: 1190: 1187: 1185: 1182: 1180: 1177: 1175: 1172: 1170: 1167: 1165: 1162: 1160: 1157: 1155: 1152: 1150: 1147: 1145: 1142: 1140: 1137: 1135: 1132: 1130: 1127: 1125: 1122: 1120: 1119:Arterial road 1117: 1116: 1114: 1110: 1104: 1103:United States 1101: 1099: 1096: 1094: 1091: 1089: 1086: 1084: 1081: 1079: 1076: 1074: 1071: 1069: 1066: 1064: 1061: 1059: 1056: 1054: 1051: 1049: 1046: 1044: 1041: 1039: 1036: 1034: 1031: 1029: 1026: 1024: 1021: 1019: 1016: 1014: 1011: 1009: 1006: 1004: 1001: 1000: 998: 996: 992: 986: 983: 981: 978: 976: 973: 971: 968: 967: 965: 963: 959: 956: 954: 953:Types of road 950: 946: 943: 936: 931: 929: 924: 922: 917: 916: 913: 904: 900: 897: 896:OpenStreetMap 892: 885: 881: 876: 862:on 2020-03-06 861: 857: 853: 849: 843: 829:on 2018-10-13 828: 824: 820: 813: 806: 802: 799: 794: 790: 779: 772: 767: 763: 759: 755: 748: 743: 742: 741: 739: 735: 731: 727: 723: 719: 715: 706: 704: 700: 696: 692: 687: 685: 681: 677: 673: 669: 665: 661: 658:now owned by 657: 653: 649: 645: 644:United States 641: 637: 633: 628: 626: 622: 618: 608: 606: 601: 599: 594: 592: 588: 584: 581:In 1897, the 579: 577: 573: 566: 556: 554: 550: 546: 542: 537: 535: 531: 527: 523: 519: 515: 509: 494: 492: 487: 483: 481: 477: 473: 469: 465: 461: 457: 452: 443: 430: 427: 424: 422: 419: 417: 414: 412: 409: 408: 407: 396: 392: 389: 386: 383: 381:Directional T 380: 377: 375: 372: 370: 367: 364: 361: 360: 356: 352: 348: 343: 339: 323: 319: 315: 312:A plane on a 310: 306: 304: 300: 295: 293: 289: 284: 280: 276: 272: 267: 265: 261: 257: 253: 252: 247: 243: 239: 238:United States 235: 231: 227: 226:road junction 212: 209: 207: 201: 197: 191:Disadvantages 188: 186: 182: 167: 165: 164: 159: 158: 153: 152: 147: 146: 141: 140: 135: 130: 128: 124: 120: 116: 112: 109:, or airport 108: 104: 100: 96: 92: 88: 84: 80: 76: 67: 60: 55: 49: 45: 41: 36: 30: 26: 21: 2233:Traffic cone 2223:Rumble strip 2124:Truck bypass 2079:Shared space 2039:Passing lane 2024:Managed lane 1981:Bicycle lane 1863:Washboarding 1858:Traffic sign 1783:Hairpin turn 1552:Texas U-turn 1482:Box junction 1381: 1376:Interchanges 1320:Route number 1228:Country lane 970:Bike freeway 891: 884:Network Rail 875: 864:. Retrieved 860:the original 855: 842: 831:. Retrieved 827:the original 822: 812: 793: 778:Central Park 722:Central Park 712: 688: 629: 614: 602: 595: 580: 568: 551:and even to 538: 526:Network Rail 511: 488: 484: 450: 448: 404: 349:(below) and 337: 303:free-flowing 302: 298: 296: 268: 263: 249: 233: 229: 223: 210: 202: 198: 194: 181:speed limits 178: 161: 155: 149: 145:intersection 143: 137: 133: 131: 91:traffic flow 82: 72: 2271:Performance 2203:Kassel kerb 2160:Botts' dots 2148:Demarcation 1848:Storm drain 1813:Road debris 1738:Aquaplaning 1731:environment 1719:Road safety 1597:Cobblestone 1547:Superstreet 1352:Winter road 1300:Concurrency 1293:Other terms 1284:Sunken lane 1253:Main street 1198:Local roads 754:Frank Gehry 734:underpasses 726:Netherlands 714:Footbridges 691:"area 1520" 553:street cars 428:interchange 246:New Zealand 139:interchange 127:underpasses 2273:indicators 2242:Structures 2193:Guard rail 2069:Road verge 1942:Seat belts 1878:Snowsquall 1843:Speed bump 1823:Road train 1644:Glassphalt 1584:Bioasphalt 1557:Turnaround 1532:Roundabout 1462:(at-grade) 1428:Roundabout 1393:Cloverleaf 1248:Green lane 1184:Trunk road 1112:Main roads 995:By country 866:2020-05-10 833:2010-10-09 785:References 756:-designed 549:light rail 506:See also: 476:Birmingham 426:Roundabout 251:slip roads 175:Advantages 119:overpasses 40:overpasses 2064:Road diet 1966:Space and 1911:Road rage 1798:Oil spill 1758:Crosswind 1748:Black ice 1743:Avalanche 1669:Permeable 1502:Jughandle 1497:Hook turn 1403:Free-flow 1347:Toll road 1266:Side road 1223:Boulevard 1179:Super two 1174:Ring road 1149:Link road 1048:Hong Kong 1003:Australia 945:hierarchy 758:BP bridge 636:Cleveland 605:'X' shape 530:Melbourne 460:ring road 316:over the 279:motorways 242:Australia 234:off ramps 185:accidents 136:or as an 99:footpaths 48:Barcelona 2333:Category 2252:Causeway 2089:Shoulder 1925:Vehicles 1873:Whiteout 1833:Rockfall 1828:Roadkill 1753:Bleeding 1729:Road and 1689:Sealcoat 1614:Corduroy 1602:Concrete 1592:Chipseal 1571:Surfaces 1423:Raindrop 1238:Driveway 1233:Dead end 1213:Backroad 1164:2+2 road 1159:2+1 road 1083:Portugal 1073:Pakistan 899:Archived 801:Archived 699:Liubotyn 634:through 497:Railways 464:Coventry 318:Autobahn 275:highways 271:freeways 220:Overview 151:at-grade 103:railways 87:junction 59:Xiaoshan 2155:Bollard 2139:Woonerf 1868:Washout 1808:Pothole 1721:factors 1709:Texture 1679:Plastic 1659:Macadam 1448:Trumpet 1398:Diamond 1169:Parkway 1144:Highway 1058:Ireland 1038:Germany 1028:Croatia 1008:Belgium 762:Chicago 738:tunnels 730:Denmark 718:subways 703:Ukraine 684:Conrail 543:of the 528:and in 518:bridges 480:Bristol 468:England 451:weaving 437:Weaving 314:taxiway 260:Ireland 170:Effects 123:tunnels 115:Bridges 111:runways 61:, China 29:Chicago 2248:Bridge 1932:Airbag 1704:Tarmac 1649:Gravel 1477:Bowtie 1418:Parclo 1342:Stroad 1305:Detour 1280:Street 1208:Avenue 1093:Taiwan 1078:Poland 1043:Greece 1018:Canada 1013:Brazil 682:, and 660:Amtrak 621:Taiwan 107:canals 1674:Plank 1588:Brick 1438:Stack 1204:Alley 1088:Spain 1068:Nepal 1063:Italy 1053:India 1023:China 668:SEPTA 625:Japan 329:Types 281:, or 248:) or 215:Roads 206:lifts 160:or a 95:roads 46:near 44:Spain 2184:Curb 2015:Lane 1778:Ford 1694:Sett 1634:Dirt 1262:Road 942:Road 752:The 728:and 716:and 654:and 640:Ohio 623:and 539:The 432:four 232:and 154:, a 125:(or 117:(or 1838:Rut 1773:Fog 1654:Ice 760:in 701:in 462:of 351:M23 347:M25 320:at 301:or 81:), 73:In 27:in 2335:: 882:- 854:. 850:. 821:. 740:. 705:. 686:. 678:, 674:, 670:, 642:, 638:, 578:. 555:. 536:. 466:, 355:UK 305:. 277:, 273:, 266:. 258:, 244:, 240:, 230:on 187:. 148:, 113:. 105:, 101:, 97:, 1384:) 1380:( 934:e 927:t 920:v 869:. 836:. 357:. 254:( 236:(

Index


Jane Byrne Interchange
Chicago

overpasses
Spain
Barcelona

Xiaoshan

civil engineering
highway engineering
junction
traffic flow
roads
footpaths
railways
canals
runways
Bridges
overpasses
tunnels
underpasses
interchange
intersection
at-grade
diamond crossing
level crossing
speed limits
accidents

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