1616:
20:
65:
The roundabout diameter, including the center island and circulating roadway, varies from 90 to 300 feet (27–91 m) depending on the speed of traffic on the approaches, the volume of traffic served, the number of approaches, and the design vehicle.
58:
Left turns are prohibited at the main intersection, which therefore requires only a two-phase signal. Vehicles yield upon entry to the roundabout. If the roundabout has only two entrances, the entry from the main intersection does not have to yield.
69:
This configuration would reduce delay for the arterial street, increase capacity, and reduce the number of stops required. The primary problem with such a configuration is driver disregard for the left turn prohibition at the main intersection.
120:
62:
A bowtie can be adapted from an existing generic intersection that has two nearby roundabouts, so long as the roundabouts are on opposing sides of the intersection.
152:
174:
168:
127:
180:
1682:
275:
383:
328:
213:
1653:
1593:
723:
688:
1598:
713:
698:
313:
1575:
1565:
802:
693:
338:
1677:
1570:
1384:
909:
772:
728:
39:
24:
288:
1291:
1181:
378:
469:
1580:
1399:
255:
1227:
1560:
1286:
1281:
1256:
373:
293:
206:
1646:
1493:
1460:
797:
767:
708:
673:
348:
1455:
1176:
792:
683:
283:
1498:
1196:
919:
817:
703:
303:
89:
100:
8:
1672:
1450:
1324:
1043:
999:
887:
739:
678:
434:
419:
414:
308:
242:
199:
93:
35:
1639:
1627:
1354:
1168:
1153:
964:
899:
822:
807:
752:
656:
590:
580:
551:
488:
358:
323:
85:
175:
Eliminating Left-Turns at a
Signalized Intersection With The Use of Nearby Roundabouts
1414:
1217:
1148:
1098:
837:
718:
556:
528:
513:
498:
368:
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186:
146:
1271:
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1033:
949:
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617:
459:
265:
260:
82:
1508:
1468:
1379:
1369:
1339:
1329:
1314:
1276:
1232:
1058:
1048:
979:
595:
298:
169:
Unconventional Left-Turn
Alternatives for Urban and Suburban Arterials An Update
1623:
1478:
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1409:
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1374:
1186:
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610:
538:
409:
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343:
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1666:
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1394:
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1299:
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646:
605:
523:
399:
233:
47:
1513:
1503:
1404:
1359:
1319:
1309:
1304:
1261:
1143:
1138:
1063:
989:
959:
851:
832:
762:
600:
508:
250:
1483:
1128:
1118:
1093:
1018:
929:
882:
877:
827:
632:
564:
533:
1473:
1349:
1222:
1158:
1123:
1103:
984:
954:
924:
864:
812:
464:
43:
181:
Guidance on the Safe
Implementation of Unconventional Arterial Designs
1344:
1191:
1078:
1038:
1028:
1023:
914:
782:
777:
627:
546:
503:
454:
444:
439:
429:
1537:
1532:
1364:
1113:
1108:
969:
934:
872:
518:
493:
318:
1615:
1435:
1419:
1088:
939:
449:
424:
261:
Dual carriageway / Divided highway / Expressway
191:
42:) or right turns (in jurisdictions that drive on the left), with
1542:
1212:
622:
585:
73:
As yet no agency has designed a complete bowtie road junction.
187:
19:
222:
1053:
101:
Hamburger roundabout/throughabout/cut-through roundabout
46:on the cross street. It is an alternative to the
1664:
1647:
207:
121:"Unconventional Arterial Intersection Design"
151:: CS1 maint: multiple names: authors list (
1654:
1640:
214:
200:
18:
1665:
23:A bowtie road junction, where traffic
1310:Median / Central reservation
195:
88:designs analogous to the bowtie, see
40:jurisdictions that drive on the right
1610:
118:
13:
1228:Risk compensation (road transport)
221:
119:Reid, Jonathan, P.E. (July 2004).
14:
1694:
162:
1614:
1594:Glossary of road transport terms
126:. pp. 66–67. Archived from
1683:Roundabouts and traffic circles
1622:This road-related article is a
112:
38:which replaces left turns (in
1:
1576:Pavement performance modeling
1566:International roughness index
106:
1626:. You can help Knowledge by
1571:Present serviceability index
1365:Sidewalk / Pavement
910:Diamond grinding of pavement
7:
1543:Underpass / Tunnel
1538:Overpass / Flyover
1292:High-occupancy vehicle lane
1182:Driving under the influence
256:Freeway / Motorway
76:
10:
1699:
1609:
470:Highway systems by country
80:
1589:
1581:Granular base equivalency
1551:
1522:
1428:
1400:Traffic signal preemption
1245:
1205:
1167:
1009:
998:
850:
808:Right-in/right-out (RIRO)
737:
714:Single-point urban (SPUI)
654:
645:
573:
478:
392:
274:
241:
232:
53:
16:Type of road intersection
1561:Pavement condition index
1287:High-occupancy toll lane
1282:Contraflow lane reversal
1257:Barrier transfer machine
415:Express-collector setup
1599:Road types by features
1494:Raised pavement marker
1461:Constant-slope barrier
1385:Traffic directionality
1375:Street running railway
798:Protected intersection
27:
1456:Concrete step barrier
793:Offset T-intersection
22:
1499:Road surface marking
1197:Single-vehicle crash
920:Full depth recycling
818:Seagull intersection
133:on November 15, 2015
90:Dumbbell interchange
1678:Road junction types
1325:Pedestrian crossing
888:Reinforced concrete
724:Three-level diamond
435:Two-lane expressway
420:Farm-to-market road
94:Dogbone interchange
25:drives on the right
1355:Runaway truck ramp
1177:Driver's education
965:Rubberized asphalt
900:Crocodile cracking
823:Split intersection
591:Hierarchy of roads
552:Single carriageway
34:is a type of road
28:
1635:
1634:
1607:
1606:
1415:Wide outside lane
1241:
1240:
1218:Automotive safety
1099:Road slipperiness
846:
845:
694:Diverging diamond
641:
640:
557:Single-track road
499:Bicycle boulevard
1690:
1656:
1649:
1642:
1618:
1611:
1451:Cat's eye (road)
1272:Complete streets
1044:Dead Man's Curve
1007:
1006:
945:Pavement milling
860:Asphalt concrete
803:Quadrant roadway
744:
666:
652:
651:
618:Street hierarchy
266:Elevated highway
239:
238:
216:
209:
202:
193:
192:
157:
156:
150:
142:
140:
138:
132:
125:
116:
1698:
1697:
1693:
1692:
1691:
1689:
1688:
1687:
1663:
1662:
1661:
1660:
1608:
1603:
1585:
1553:
1547:
1518:
1509:Traffic barrier
1469:F-Shape barrier
1424:
1380:Traffic calming
1340:Reversible lane
1330:Pedestrian zone
1315:Motorcycle lane
1277:Contraflow lane
1249:time allocation
1248:
1237:
1233:Underride guard
1201:
1163:
1049:Expansion joint
1011:
1001:
994:
980:Stamped asphalt
842:
773:Continuous flow
746:
742:
741:
733:
667:
663:grade-separated
660:
659:
637:
596:Private highway
569:
474:
388:
270:
228:
220:
165:
160:
144:
143:
136:
134:
130:
123:
117:
113:
109:
97:
83:grade-separated
79:
56:
17:
12:
11:
5:
1696:
1686:
1685:
1680:
1675:
1659:
1658:
1651:
1644:
1636:
1633:
1632:
1619:
1605:
1604:
1602:
1601:
1596:
1590:
1587:
1586:
1584:
1583:
1578:
1573:
1568:
1563:
1557:
1555:
1549:
1548:
1546:
1545:
1540:
1535:
1530:
1526:
1524:
1520:
1519:
1517:
1516:
1511:
1506:
1501:
1496:
1491:
1486:
1481:
1479:Jersey barrier
1476:
1471:
1466:
1463:
1458:
1453:
1448:
1443:
1438:
1432:
1430:
1426:
1425:
1423:
1422:
1417:
1412:
1410:Unused highway
1407:
1402:
1397:
1392:
1390:Traffic island
1387:
1382:
1377:
1372:
1367:
1362:
1357:
1352:
1347:
1342:
1337:
1332:
1327:
1322:
1317:
1312:
1307:
1302:
1297:
1294:
1289:
1284:
1279:
1274:
1269:
1264:
1259:
1253:
1251:
1243:
1242:
1239:
1238:
1236:
1235:
1230:
1225:
1220:
1215:
1209:
1207:
1203:
1202:
1200:
1199:
1194:
1189:
1187:Drowsy driving
1184:
1179:
1173:
1171:
1165:
1164:
1162:
1161:
1156:
1151:
1146:
1141:
1136:
1131:
1126:
1121:
1116:
1111:
1106:
1101:
1096:
1091:
1086:
1081:
1076:
1071:
1069:Level crossing
1066:
1061:
1056:
1051:
1046:
1041:
1036:
1031:
1026:
1021:
1015:
1013:
1004:
996:
995:
993:
992:
987:
982:
977:
972:
967:
962:
957:
952:
947:
942:
937:
932:
927:
922:
917:
912:
907:
902:
897:
892:
891:
890:
880:
875:
870:
867:
862:
856:
854:
848:
847:
844:
843:
841:
840:
835:
830:
825:
820:
815:
810:
805:
800:
795:
790:
785:
780:
775:
770:
768:Channelization
765:
760:
755:
753:3-way junction
749:
747:
738:
735:
734:
732:
731:
726:
721:
716:
711:
706:
701:
696:
691:
686:
681:
676:
670:
668:
655:
649:
647:Road junctions
643:
642:
639:
638:
636:
635:
630:
625:
620:
615:
614:
613:
611:business route
608:
598:
593:
588:
583:
577:
575:
571:
570:
568:
567:
562:
559:
554:
549:
544:
541:
539:Primitive road
536:
531:
526:
521:
516:
511:
506:
501:
496:
491:
486:
482:
480:
476:
475:
473:
472:
467:
462:
457:
452:
447:
442:
437:
432:
427:
422:
417:
412:
410:County highway
407:
405:Collector road
402:
396:
394:
390:
389:
387:
386:
381:
379:United Kingdom
376:
371:
366:
361:
356:
351:
346:
341:
336:
331:
326:
321:
316:
314:Czech Republic
311:
306:
301:
296:
291:
286:
280:
278:
272:
271:
269:
268:
263:
258:
253:
247:
245:
243:Limited-access
236:
230:
229:
219:
218:
211:
204:
196:
190:
189:
184:
178:
172:
164:
163:External links
161:
159:
158:
110:
108:
105:
104:
103:
78:
75:
55:
52:
50:intersection.
15:
9:
6:
4:
3:
2:
1695:
1684:
1681:
1679:
1676:
1674:
1671:
1670:
1668:
1657:
1652:
1650:
1645:
1643:
1638:
1637:
1631:
1629:
1625:
1620:
1617:
1613:
1612:
1600:
1597:
1595:
1592:
1591:
1588:
1582:
1579:
1577:
1574:
1572:
1569:
1567:
1564:
1562:
1559:
1558:
1556:
1550:
1544:
1541:
1539:
1536:
1534:
1531:
1528:
1527:
1525:
1521:
1515:
1512:
1510:
1507:
1505:
1502:
1500:
1497:
1495:
1492:
1490:
1489:Noise barrier
1487:
1485:
1482:
1480:
1477:
1475:
1472:
1470:
1467:
1464:
1462:
1459:
1457:
1454:
1452:
1449:
1447:
1446:Cable barrier
1444:
1442:
1439:
1437:
1434:
1433:
1431:
1427:
1421:
1418:
1416:
1413:
1411:
1408:
1406:
1403:
1401:
1398:
1396:
1395:Traffic lanes
1393:
1391:
1388:
1386:
1383:
1381:
1378:
1376:
1373:
1371:
1368:
1366:
1363:
1361:
1358:
1356:
1353:
1351:
1348:
1346:
1343:
1341:
1338:
1336:
1335:Refuge island
1333:
1331:
1328:
1326:
1323:
1321:
1318:
1316:
1313:
1311:
1308:
1306:
1303:
1301:
1300:Living street
1298:
1295:
1293:
1290:
1288:
1285:
1283:
1280:
1278:
1275:
1273:
1270:
1268:
1267:Climbing lane
1265:
1263:
1260:
1258:
1255:
1254:
1252:
1250:
1244:
1234:
1231:
1229:
1226:
1224:
1221:
1219:
1216:
1214:
1211:
1210:
1208:
1204:
1198:
1195:
1193:
1190:
1188:
1185:
1183:
1180:
1178:
1175:
1174:
1172:
1170:
1169:Human factors
1166:
1160:
1157:
1155:
1152:
1150:
1147:
1145:
1142:
1140:
1137:
1135:
1134:Traffic light
1132:
1130:
1127:
1125:
1122:
1120:
1117:
1115:
1112:
1110:
1107:
1105:
1102:
1100:
1097:
1095:
1092:
1090:
1087:
1085:
1084:Oversize load
1082:
1080:
1077:
1075:
1074:Manhole cover
1072:
1070:
1067:
1065:
1062:
1060:
1057:
1055:
1052:
1050:
1047:
1045:
1042:
1040:
1037:
1035:
1032:
1030:
1027:
1025:
1022:
1020:
1017:
1016:
1014:
1008:
1005:
1003:
997:
991:
988:
986:
983:
981:
978:
976:
973:
971:
968:
966:
963:
961:
958:
956:
953:
951:
948:
946:
943:
941:
938:
936:
933:
931:
928:
926:
923:
921:
918:
916:
913:
911:
908:
906:
905:Crushed stone
903:
901:
898:
896:
893:
889:
886:
885:
884:
881:
879:
876:
874:
871:
868:
866:
863:
861:
858:
857:
855:
853:
849:
839:
836:
834:
831:
829:
826:
824:
821:
819:
816:
814:
811:
809:
806:
804:
801:
799:
796:
794:
791:
789:
788:Michigan left
786:
784:
781:
779:
776:
774:
771:
769:
766:
764:
761:
759:
756:
754:
751:
750:
748:
745:
740:Intersections
736:
730:
727:
725:
722:
720:
717:
715:
712:
710:
707:
705:
702:
700:
697:
695:
692:
690:
689:Directional T
687:
685:
682:
680:
677:
675:
672:
671:
669:
664:
658:
653:
650:
648:
644:
634:
631:
629:
626:
624:
621:
619:
616:
612:
609:
607:
606:special route
604:
603:
602:
599:
597:
594:
592:
589:
587:
584:
582:
579:
578:
576:
572:
566:
563:
560:
558:
555:
553:
550:
548:
545:
542:
540:
537:
535:
532:
530:
527:
525:
524:Frontage road
522:
520:
517:
515:
512:
510:
507:
505:
502:
500:
497:
495:
492:
490:
487:
484:
483:
481:
477:
471:
468:
466:
463:
461:
458:
456:
453:
451:
448:
446:
443:
441:
438:
436:
433:
431:
428:
426:
423:
421:
418:
416:
413:
411:
408:
406:
403:
401:
400:Arterial road
398:
397:
395:
391:
385:
384:United States
382:
380:
377:
375:
372:
370:
367:
365:
362:
360:
357:
355:
352:
350:
347:
345:
342:
340:
337:
335:
332:
330:
327:
325:
322:
320:
317:
315:
312:
310:
307:
305:
302:
300:
297:
295:
292:
290:
287:
285:
282:
281:
279:
277:
273:
267:
264:
262:
259:
257:
254:
252:
249:
248:
246:
244:
240:
237:
235:
234:Types of road
231:
227:
224:
217:
212:
210:
205:
203:
198:
197:
194:
188:
185:
182:
179:
176:
173:
170:
167:
166:
154:
148:
129:
122:
115:
111:
102:
99:
98:
95:
91:
87:
84:
74:
71:
67:
63:
60:
51:
49:
48:Michigan left
45:
41:
37:
33:
26:
21:
1628:expanding it
1621:
1514:Traffic cone
1504:Rumble strip
1405:Truck bypass
1360:Shared space
1320:Passing lane
1305:Managed lane
1262:Bicycle lane
1144:Washboarding
1139:Traffic sign
1064:Hairpin turn
833:Texas U-turn
763:Box junction
757:
657:Interchanges
601:Route number
509:Country lane
251:Bike freeway
135:. Retrieved
128:the original
114:
72:
68:
64:
61:
57:
36:intersection
31:
29:
1552:Performance
1484:Kassel kerb
1441:Botts' dots
1429:Demarcation
1129:Storm drain
1094:Road debris
1019:Aquaplaning
1012:environment
1000:Road safety
878:Cobblestone
828:Superstreet
633:Winter road
581:Concurrency
574:Other terms
565:Sunken lane
534:Main street
479:Local roads
86:interchange
44:roundabouts
1673:Road stubs
1667:Categories
1554:indicators
1523:Structures
1474:Guard rail
1350:Road verge
1223:Seat belts
1159:Snowsquall
1124:Speed bump
1104:Road train
925:Glassphalt
865:Bioasphalt
838:Turnaround
813:Roundabout
743:(at-grade)
709:Roundabout
674:Cloverleaf
529:Green lane
465:Trunk road
393:Main roads
276:By country
107:References
1345:Road diet
1247:Space and
1192:Road rage
1079:Oil spill
1039:Crosswind
1029:Black ice
1024:Avalanche
950:Permeable
783:Jughandle
778:Hook turn
684:Free-flow
628:Toll road
547:Side road
504:Boulevard
460:Super two
455:Ring road
430:Link road
329:Hong Kong
284:Australia
226:hierarchy
1533:Causeway
1370:Shoulder
1206:Vehicles
1154:Whiteout
1114:Rockfall
1109:Roadkill
1034:Bleeding
1010:Road and
970:Sealcoat
895:Corduroy
883:Concrete
873:Chipseal
852:Surfaces
704:Raindrop
519:Driveway
514:Dead end
494:Backroad
445:2+2 road
440:2+1 road
364:Portugal
354:Pakistan
147:cite web
77:See also
1436:Bollard
1420:Woonerf
1149:Washout
1089:Pothole
1002:factors
990:Texture
960:Plastic
940:Macadam
729:Trumpet
679:Diamond
450:Parkway
425:Highway
339:Ireland
319:Germany
309:Croatia
289:Belgium
137:May 26,
1529:Bridge
1213:Airbag
985:Tarmac
930:Gravel
758:Bowtie
699:Parclo
623:Stroad
586:Detour
561:Street
489:Avenue
374:Taiwan
359:Poland
324:Greece
299:Canada
294:Brazil
54:Design
32:bowtie
955:Plank
869:Brick
719:Stack
485:Alley
369:Spain
349:Nepal
344:Italy
334:India
304:China
183:(pdf)
177:(pdf)
171:(pdf)
131:(PDF)
124:(PDF)
1624:stub
1465:Curb
1296:Lane
1059:Ford
975:Sett
915:Dirt
543:Road
223:Road
153:link
139:2018
92:and
81:For
30:The
1119:Rut
1054:Fog
935:Ice
1669::
149:}}
145:{{
1655:e
1648:t
1641:v
1630:.
665:)
661:(
215:e
208:t
201:v
155:)
141:.
96:.
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