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.
731:(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 496:
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.
531:. 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 535:
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.
466: 379: 140:), or a combination of both can be built at a junction to achieve the needed grade separation. 35: 2185: 1906: 1522: 1413: 1013: 658: 555: 332: 161: 527:
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+)
661:main lines. The lines are included as part of the 2341: 641:In the United States, a flying junction on the 460:On roadways with grade-separated interchanges, 827: 235:The term is most widely applied to describe a 937: 673:. The most complex of these junctions, near 787:Nineteenth-century pedestrian underpass in 743:where cycling is strongly encouraged. Long 512: 944: 930: 719: 219:, but these can be time-consuming to use. 834:ENGINEERING HANDBOOK, Second Edition 1950 596:(LSWR) made use of a flying junction at 451: 351: 318: 75: 63: 44: 29: 14: 2342: 677:, handles railway traffic for Amtrak, 411: 356:4 level stack interchange between the 349:These junctions connect two freeways: 2040:Median / Central reservation 925: 809:City of Eureka Municipal Code 71.85 500:Weaving can be alleviated by using 485:, the M6/M5 junction north-west of 24: 1958:Risk compensation (road transport) 951: 859:Texas Department of Transportation 569: 344: 25: 2361: 489:, and the A4/M5 junction west of 177:, which are not grade-separated. 2324:Glossary of road transport terms 891:Reducing risk at level crossings 780: 756: 609:Clapham Junction railway station 594:London and South Western Railway 483:M25, the London orbital motorway 301:; it is all but impossible on a 201: 398:Turbine (whirlpool) interchange 900: 884: 851: 821: 802: 545:Level Crossing Removal Project 432:Single-point urban interchange 427:Partial cloverleaf interchange 68:Rail-rail grade separation in 13: 1: 2306:Pavement performance modeling 2296:International roughness index 795: 335:- a type of grade separation. 185: 2301:Present serviceability index 2095:Sidewalk / Pavement 1640:Diamond grinding of pavement 7: 2273:Underpass / Tunnel 2268:Overpass / Flyover 2022:High-occupancy vehicle lane 1912:Driving under the influence 986:Freeway / Motorway 775:was built for pedestrians. 507: 502:collector/distributor roads 230: 10: 2366: 1200:Highway systems by country 573: 516: 447: 180: 96:is a method of aligning a 2319: 2311:Granular base equivalency 2281: 2252: 2158: 2130:Traffic signal preemption 1975: 1935: 1897: 1739: 1728: 1580: 1538:Right-in/right-out (RIRO) 1467: 1444:Single-point urban (SPUI) 1384: 1375: 1303: 1208: 1122: 1004: 971: 962: 305:, though a few do exist. 132:, also called flyovers), 2291:Pavement condition index 2017:High-occupancy toll lane 2012:Contraflow lane reversal 1987:Barrier transfer machine 513:With roads and footpaths 404:Various incarnations of 339: 225: 53:for grade separation in 1145:Express-collector setup 867:TxDOT Visual Dictionary 828:Henry K. Evans (1950). 720:Footbridges and subways 585:and one which is not a 389:Cloverstack interchange 303:U.S. Interstate Highway 2329:Road types by features 2224:Raised pavement marker 2191:Constant-slope barrier 2115:Traffic directionality 2105:Street running railway 1528:Protected intersection 897:. Accessed 27 May 2024 467:cloverleaf interchange 457: 380:Cloverleaf interchange 369: 336: 153:– in contrast with an 81: 73: 61: 42: 36:Jane Byrne Interchange 2186:Concrete step barrier 1523:Offset T-intersection 704:, which includes the 659:Pennsylvania Railroad 556:Great Central Railway 455: 355: 333:Leipzig-Halle Airport 322: 310:fully grade separated 79: 67: 48: 33: 27:Type of road junction 2229:Road surface marking 1927:Single-vehicle crash 1650:Full depth recycling 1548:Seagull intersection 700:In what is known as 401:Windmill interchange 2055:Pedestrian crossing 1618:Reinforced concrete 1454:Three-level diamond 1165:Two-lane expressway 1150:Farm-to-market road 706:former Soviet Union 422:Diamond interchange 412:Partially separated 385:Trumpet interchange 90:highway engineering 88:(more specifically 2085:Runaway truck ramp 1907:Driver's education 1695:Rubberized asphalt 1630:Crocodile cracking 1553:Split intersection 1321:Hierarchy of roads 1282:Single carriageway 912:2011-02-23 at the 814:2012-02-12 at the 691:CSX Transportation 683:New Jersey Transit 663:Northeast Corridor 628:high-speed railway 533:high speed railway 458: 406:spaghetti junction 395:Semi-directional T 370: 337: 82: 74: 62: 43: 2337: 2336: 2145:Wide outside lane 1971: 1970: 1948:Automotive safety 1829:Road slipperiness 1576: 1575: 1424:Diverging diamond 1371: 1370: 1287:Single-track road 1229:Bicycle boulevard 667:Keystone Corridor 643:Nickel Plate Road 374:Stack interchange 294:dual carriageways 280:Typically, large 86:civil engineering 16:(Redirected from 2357: 2181:Cat's eye (road) 2002:Complete streets 1774:Dead Man's Curve 1737: 1736: 1675:Pavement milling 1590:Asphalt concrete 1533:Quadrant roadway 1474: 1396: 1382: 1381: 1348:Street hierarchy 996:Elevated highway 969: 968: 946: 939: 932: 923: 922: 916: 904: 898: 888: 882: 881: 879: 878: 869:. Archived from 855: 849: 848: 846: 845: 825: 819: 818:(California, US) 806: 784: 760: 687:Norfolk Southern 675:Philadelphia Zoo 602:Southern Railway 598:Worting Junction 552:London Extension 299:British motorway 168:diamond crossing 145:grade separation 94:grade separation 21: 2365: 2364: 2360: 2359: 2358: 2356: 2355: 2354: 2340: 2339: 2338: 2333: 2315: 2283: 2277: 2248: 2239:Traffic barrier 2199:F-Shape barrier 2154: 2110:Traffic calming 2070:Reversible lane 2060:Pedestrian zone 2045:Motorcycle lane 2007:Contraflow lane 1979:time allocation 1978: 1967: 1963:Underride guard 1931: 1893: 1779:Expansion joint 1741: 1731: 1724: 1710:Stamped asphalt 1572: 1503:Continuous flow 1476: 1472: 1471: 1463: 1397: 1393:grade-separated 1390: 1389: 1367: 1326:Private highway 1299: 1204: 1118: 1000: 958: 950: 920: 919: 914:Wayback Machine 905: 901: 889: 885: 876: 874: 856: 852: 843: 841: 826: 822: 816:Wayback Machine 807: 803: 798: 791: 785: 776: 761: 722: 624: 583:flying junction 578: 576:Flying junction 572: 570:Flying junction 543:as part of the 525:level crossings 521: 515: 510: 450: 414: 364:(above) in the 347: 345:Fully separated 342: 275:grade separated 233: 228: 204: 188: 183: 28: 23: 22: 18:Grade-separated 15: 12: 11: 5: 2363: 2353: 2352: 2350:Junction types 2335: 2334: 2332: 2331: 2326: 2320: 2317: 2316: 2314: 2313: 2308: 2303: 2298: 2293: 2287: 2285: 2279: 2278: 2276: 2275: 2270: 2265: 2260: 2256: 2254: 2250: 2249: 2247: 2246: 2241: 2236: 2231: 2226: 2221: 2216: 2211: 2209:Jersey barrier 2206: 2201: 2196: 2193: 2188: 2183: 2178: 2173: 2168: 2162: 2160: 2156: 2155: 2153: 2152: 2147: 2142: 2140:Unused highway 2137: 2132: 2127: 2122: 2120:Traffic island 2117: 2112: 2107: 2102: 2097: 2092: 2087: 2082: 2077: 2072: 2067: 2062: 2057: 2052: 2047: 2042: 2037: 2032: 2027: 2024: 2019: 2014: 2009: 2004: 1999: 1994: 1989: 1983: 1981: 1973: 1972: 1969: 1968: 1966: 1965: 1960: 1955: 1950: 1945: 1939: 1937: 1933: 1932: 1930: 1929: 1924: 1919: 1917:Drowsy driving 1914: 1909: 1903: 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1143: 1141: 1138: 1136: 1133: 1131: 1130:Arterial road 1128: 1127: 1125: 1121: 1115: 1114:United States 1112: 1110: 1107: 1105: 1102: 1100: 1097: 1095: 1092: 1090: 1087: 1085: 1082: 1080: 1077: 1075: 1072: 1070: 1067: 1065: 1062: 1060: 1057: 1055: 1052: 1050: 1047: 1045: 1042: 1040: 1037: 1035: 1032: 1030: 1027: 1025: 1022: 1020: 1017: 1015: 1012: 1011: 1009: 1007: 1003: 997: 994: 992: 989: 987: 984: 982: 979: 978: 976: 974: 970: 967: 965: 964:Types of road 961: 957: 954: 947: 942: 940: 935: 933: 928: 927: 924: 915: 911: 908: 907:OpenStreetMap 903: 896: 892: 887: 873:on 2020-03-06 872: 868: 864: 860: 854: 840:on 2018-10-13 839: 835: 831: 824: 817: 813: 810: 805: 801: 790: 783: 778: 774: 770: 766: 759: 754: 753: 752: 750: 746: 742: 738: 734: 730: 726: 717: 715: 711: 707: 703: 698: 696: 692: 688: 684: 680: 676: 672: 669:now owned by 668: 664: 660: 656: 655:United States 652: 648: 644: 639: 637: 633: 629: 619: 617: 612: 610: 605: 603: 599: 595: 592:In 1897, the 590: 588: 584: 577: 567: 565: 561: 557: 553: 548: 546: 542: 538: 534: 530: 526: 520: 505: 503: 498: 494: 492: 488: 484: 480: 476: 472: 468: 463: 454: 441: 438: 435: 433: 430: 428: 425: 423: 420: 419: 418: 407: 403: 400: 397: 394: 392:Directional T 391: 388: 386: 383: 381: 378: 375: 372: 371: 367: 363: 359: 354: 350: 334: 330: 326: 323:A plane on a 321: 317: 315: 311: 306: 304: 300: 295: 291: 287: 283: 278: 276: 272: 268: 264: 263: 258: 254: 250: 249:United States 246: 242: 238: 237:road junction 223: 220: 218: 212: 208: 202:Disadvantages 199: 197: 193: 178: 176: 175: 170: 169: 164: 163: 158: 157: 152: 151: 146: 141: 139: 135: 131: 127: 123: 120:, or airport 119: 115: 111: 107: 103: 99: 95: 91: 87: 78: 71: 66: 60: 56: 52: 47: 41: 37: 32: 19: 2244:Traffic cone 2234:Rumble strip 2135:Truck bypass 2090:Shared space 2050:Passing lane 2035:Managed lane 1992:Bicycle lane 1874:Washboarding 1869:Traffic sign 1794:Hairpin turn 1563:Texas U-turn 1493:Box junction 1392: 1387:Interchanges 1331:Route number 1239:Country lane 981:Bike freeway 902: 895:Network Rail 886: 875:. Retrieved 871:the original 866: 853: 842:. Retrieved 838:the original 833: 823: 804: 789:Central Park 733:Central Park 723: 699: 640: 625: 613: 606: 591: 579: 562:and even to 549: 537:Network Rail 522: 499: 495: 461: 459: 415: 360:(below) and 348: 314:free-flowing 313: 309: 307: 279: 274: 260: 244: 240: 234: 221: 213: 209: 205: 192:speed limits 189: 172: 166: 160: 156:intersection 154: 148: 144: 142: 102:traffic flow 93: 83: 2282:Performance 2214:Kassel kerb 2171:Botts' dots 2159:Demarcation 1859:Storm drain 1824:Road debris 1749:Aquaplaning 1742:environment 1730:Road safety 1608:Cobblestone 1558:Superstreet 1363:Winter road 1311:Concurrency 1304:Other terms 1295:Sunken lane 1264:Main street 1209:Local roads 765:Frank Gehry 745:underpasses 737:Netherlands 725:Footbridges 702:"area 1520" 564:street cars 439:interchange 257:New Zealand 150:interchange 138:underpasses 2284:indicators 2253:Structures 2204:Guard rail 2080:Road verge 1953:Seat belts 1889:Snowsquall 1854:Speed bump 1834:Road train 1655:Glassphalt 1595:Bioasphalt 1568:Turnaround 1543:Roundabout 1473:(at-grade) 1439:Roundabout 1404:Cloverleaf 1259:Green lane 1195:Trunk road 1123:Main roads 1006:By country 877:2020-05-10 844:2010-10-09 796:References 767:-designed 560:light rail 517:See also: 487:Birmingham 437:Roundabout 262:slip roads 186:Advantages 130:overpasses 51:overpasses 2075:Road diet 1977:Space and 1922:Road rage 1809:Oil spill 1769:Crosswind 1759:Black ice 1754:Avalanche 1680:Permeable 1513:Jughandle 1508:Hook turn 1414:Free-flow 1358:Toll road 1277:Side road 1234:Boulevard 1190:Super two 1185:Ring road 1160:Link road 1059:Hong Kong 1014:Australia 956:hierarchy 769:BP bridge 647:Cleveland 616:'X' shape 541:Melbourne 471:ring road 327:over the 290:motorways 253:Australia 245:off ramps 196:accidents 147:or as an 110:footpaths 59:Barcelona 2344:Category 2263:Causeway 2100:Shoulder 1936:Vehicles 1884:Whiteout 1844:Rockfall 1839:Roadkill 1764:Bleeding 1740:Road and 1700:Sealcoat 1625:Corduroy 1613:Concrete 1603:Chipseal 1582:Surfaces 1434:Raindrop 1249:Driveway 1244:Dead end 1224:Backroad 1175:2+2 road 1170:2+1 road 1094:Portugal 1084:Pakistan 910:Archived 812:Archived 710:Liubotyn 645:through 508:Railways 475:Coventry 329:Autobahn 286:highways 282:freeways 231:Overview 162:at-grade 114:railways 98:junction 70:Xiaoshan 2166:Bollard 2150:Woonerf 1879:Washout 1819:Pothole 1732:factors 1720:Texture 1690:Plastic 1670:Macadam 1459:Trumpet 1409:Diamond 1180:Parkway 1155:Highway 1069:Ireland 1049:Germany 1039:Croatia 1019:Belgium 773:Chicago 749:tunnels 741:Denmark 729:subways 714:Ukraine 695:Conrail 554:of the 539:and in 529:bridges 491:Bristol 479:England 462:weaving 448:Weaving 325:taxiway 271:Ireland 181:Effects 134:tunnels 126:Bridges 122:runways 72:, China 40:Chicago 2259:Bridge 1943:Airbag 1715:Tarmac 1660:Gravel 1488:Bowtie 1429:Parclo 1353:Stroad 1316:Detour 1291:Street 1219:Avenue 1104:Taiwan 1089:Poland 1054:Greece 1029:Canada 1024:Brazil 693:, and 671:Amtrak 632:Taiwan 118:canals 1685:Plank 1599:Brick 1449:Stack 1215:Alley 1099:Spain 1079:Nepal 1074:Italy 1064:India 1034:China 679:SEPTA 636:Japan 340:Types 292:, or 259:) or 226:Roads 217:lifts 171:or a 106:roads 57:near 55:Spain 2195:Curb 2026:Lane 1789:Ford 1705:Sett 1645:Dirt 1273:Road 953:Road 763:The 739:and 727:and 665:and 651:Ohio 634:and 550:The 443:four 243:and 165:, a 136:(or 128:(or 1849:Rut 1784:Fog 1665:Ice 771:in 712:in 473:of 362:M23 358:M25 331:at 312:or 92:), 84:In 38:in 2346:: 893:- 865:. 861:. 832:. 751:. 716:. 697:. 689:, 685:, 681:, 653:, 649:, 589:. 566:. 547:. 477:, 366:UK 316:. 288:, 284:, 277:. 269:, 255:, 251:, 241:on 198:. 159:, 124:. 116:, 112:, 108:, 1395:) 1391:( 945:e 938:t 931:v 880:. 847:. 368:. 265:( 247:( 20:)

Index

Grade-separated

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

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