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Macadam

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149:, maximum size 3 inches (7.6 cm), to a depth of about 8 inches (20 cm). The third layer was about 2 inches (5 cm) thick with a maximum aggregate size of 1 inch (2.5 cm). This top level surface permitted a smoother shape and protected the larger stones in the road structure from iron wheels and horse hooves. To keep the running surface level with the countryside, this road was put in a trench, which created drainage problems. These problems were addressed by changes that included digging deep side ditches, making the surface as solid as possible, and constructing the road with a difference in elevation (height) between the two edges, that difference being referred to interchangeably as the road's 232: 166: 76: 410: 282: 399:, who filled the gaps between the surface stones with a mixture of stone dust and water, providing a smoother surface for the increased traffic using the roads. This basic method of construction is sometimes known as water-bound macadam. Although this method required a great deal of manual labour, it resulted in a strong and free-draining pavement. Roads constructed in this manner were described as "macadamized." 32: 387:
His legacy lies in his advocacy of effective road maintenance and management. He advocated a central road authority with trained professional officials who could be paid a salary that would keep them from corruption. These professionals could give their entire time to these duties and be held responsible for their actions.
322: in) in diameter; these were checked by supervisors who carried scales. A workman could check the stone size himself by seeing if the stone would fit into his mouth. The importance of the 2 cm stone size was that the stones needed to be much smaller than the four-inch (10 cm) width of the iron 300:
underneath from water and wear. An under-layer of small angular broken stones would act as a solid mass. Keeping the surface stones smaller than the width of a wheel made for a good running surface. The small surface stones also provided low stress on the road, so long as it could be kept reasonably dry.
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McAdam's renown is his effective and economical construction, which was a great improvement over the methods used by his generation. He emphasised that roads could be constructed for any kind of traffic, and he helped to alleviate the resentment travellers felt toward increasing traffic on the roads.
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Broken stone was wedged into the spaces between the tapered perpendicular faces to provide the layer with good lateral control. Telford kept the natural formation level and used masons to camber the upper surface of the blocks. He placed a 6-inch (15 cm) layer of stone no bigger than 2.4 in
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McAdam directed that no substance that would absorb water and affect the road by frost should be incorporated into the road. Neither was anything to be laid on the clean stone to bind the road. The action of the road traffic would cause the broken stone to combine with its own angles, merging into a
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McAdam believed that the "proper method" of breaking stones for utility and rapidity was accomplished by people sitting down and using small hammers, breaking the stones so that none of them was larger than six ounces (170 g) in weight. He also wrote that the quality of the road would depend on
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pavement), sometimes referred to in the U.S. as blacktop, was introduced in the 1920s. Instead of laying the stone and sand aggregates on the road and then spraying the top surface with binding material, in the asphalt paving method the aggregates are thoroughly mixed with the binding material and
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McAdam's method was simpler yet more effective at protecting roadways: he discovered that massive foundations of rock upon rock were unnecessary and asserted that native soil alone would support the road and traffic upon it, as long as it was covered by a road crust that would protect the soil
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Telford used roughly 12 in Ă— 10 in Ă— 6 in (30 cm Ă— 25 cm Ă— 15 cm) partially shaped paving stones (pitchers), with a slight flat face on the bottom surface. He turned the other faces more vertically than Tresaguet's method. The longest edge was
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Where the structure could not be raised, Telford drained the area surrounding the roadside. Previous road builders in Britain ignored drainage problems and Telford's rediscovery of drainage principles was a major contribution to road construction. Notably, around the same time,
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and broken stone. This structure came to be known as "Telford pitching." Telford's road depended on a resistant structure to prevent water from collecting and corroding the strength of the pavement. Telford raised the pavement structure above ground level whenever possible.
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Size of stones was central to McAdam's road building theory. The lower 8 in (20 cm) road thickness was restricted to stones no larger than 3 inches (7.5 cm). The upper 2-inch-thick (5 cm) layer of stones was limited to stones 2 centimetres
421:, dust became a serious problem on macadam roads. The area of low air pressure created under fast-moving vehicles sucked dust from the road surface, creating dust clouds and a gradual unraveling of the road material. This problem was approached by spraying 264:
and was responsible for 149 miles of road. He then put his ideas about road construction into practice, the first 'macadamised' stretch of road being Marsh Road at Ashton Gate, Bristol. He also began to actively propagate his ideas in two booklets called
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This road was completed in 1823, using McAdam's road techniques, except that the finished road was compacted with a cast iron roller instead of relying on road traffic for compaction. The second American road built using McAdam principles was the
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Unlike Telford and other road builders of the time, McAdam laid his roads almost level. His 30-foot-wide (9.1 m) road required a rise of only 3 inches (7.6 cm) from the edges to the centre. Cambering and elevation of the road above the
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strongly advocated that drainage was in fact an important factor in road construction and astonished colleagues by building dry roads even through marshland. He accomplished this by incorporating a layer of brushwood and heather.
138:, he had opportunity to develop a better and cheaper method of road construction. In 1775, Tresaguet became engineer-general and presented his answer for road improvement in France, which soon became standard practice there. 196:
Road Commission between 1815 and 1830. Telford extended Tresaguet's theories but emphasized high-quality stone. He recognized that some of the road problems of the French could be avoided by using cubical stone blocks.
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is placed in shallow, convex layers and compacted thoroughly. A binding layer of stone dust (crushed stone from the original material) may form; it may also, after rolling, be covered with a cement or
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A Manual of The Principles and Practice of Road-Making: comprising the location, construction, and improvement of roads (common, macadam, paved, plank, etc.) and rail-roads
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in 1823; in the foreground, workers are breaking stones "so as not to exceed 6 ounces (170 g) in weight or to pass a two-inch (5 cm) ring".
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building. A Frenchman from an engineering family, he worked paving roads in Paris from 1757 to 1764. As chief engineer of road construction of
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A. W. Skempton (2002). A Biographical Dictionary of Civil Engineers in Great Britain and Ireland: 1500–1830. p.416. Thomas Telford, 2002
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binder to keep dust and stones together. The method simplified what had been considered state-of-the-art at that point.
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Because of the historic use of macadam as a road surface, roads in some parts of the United States (such as parts of
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McAdam's road building technology was applied to roads by other engineers. One of these engineers was
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arranged crossways to the traffic direction, and the joints were broken in the method of conventional
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Remarks on the Present System of Road Making; With Observations, Deduced from Practice and Experience
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how carefully the stones were spread on the surface over a sizeable space, one shovelful at a time.
256:, England, in 1802 and became a Commissioner for Paving in 1806. On 15 January 1816, he was elected 2378: 2104: 2099: 2074: 1191: 1111: 1024: 855:," The Independent, New York, Volume 99, July, August, September 1919, 228. Retrieved on 2009-11-3. 396: 715: 567: 363: 170: 45: 20: 165: 75: 2311: 2278: 1615: 1585: 1526: 1491: 1166: 146: 472:. Similarly, the term "tarmac" is sometimes colloquially applied to asphalt roads or aircraft 2273: 1994: 1610: 1501: 1101: 426: 2316: 2014: 1737: 1635: 1521: 1121: 442: 343: 286: 141:
Trésaguet had recommended a roadway consisting of three layers of stones laid on a crowned
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which was 73 miles (117 km) long and was completed in 1830 after five years of work.
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with side ditches for drainage. The first two layers consisted of angular hand-broken
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Ways of the World: A History of the World's Roads and of the Vehicles That Used Them
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the mixture is laid all together. While macadam roads have been resurfaced in most
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but with the smallest faces of the pitcher forming the upper and lower surfaces.
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Highways: the Location, Design, Construction and Maintenance of Road Pavements
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A Practical Essay on the Scientific Repair and Preservation of Public Roads,
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and during the next seven years his hobby became an obsession. He moved to
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An illustration of the first macadamized road in the United States between
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The first macadam road built in the United States was constructed between
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is sometimes considered the first person to bring post-Roman science to
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New macadam road construction at McRoberts, Kentucky: pouring tar. 1926
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on the surface to create tar-bound macadam. In 1902 a Swiss doctor,
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Dual carriageway / Divided highway / Expressway
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Stephen T. Muench; Joe P. Mahoney; Linda M. Pierce; et al.,
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level, solid surface that would withstand weather or traffic.
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Remarks (or Observations) on the Present System of Roadmaking
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Road. This was the last section of unimproved road between
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enabled rain water to run off into ditches on either side.
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McAdam's publications as available at Internet Archive
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London: John Murray. pp.  337: 30: 842: 762: 244:John Loudon McAdam was born in 117: 44:may be too short to adequately 790:O'Flaherty, Coleman A (2002), 550: 239: 54:provide an accessible overview 1: 2394:Pavement performance modeling 2384:International roughness index 491: 290: 128:Pierre-Marie-JĂ©rĂ´me TrĂ©saguet 123:Pierre-Marie-JĂ©rĂ´me TrĂ©saguet 2389:Present serviceability index 2183:Sidewalk / Pavement 1728:Diamond grinding of pavement 626:McAdam, John Loudon (1824), 192:. He became director of the 7: 2361:Underpass / Tunnel 2356:Overpass / Flyover 2110:High-occupancy vehicle lane 2000:Driving under the influence 1074:Freeway / Motorway 479: 10: 2469: 1288:Highway systems by country 770:"The History of Boonsboro" 18: 2407: 2399:Granular base equivalency 2369: 2340: 2246: 2218:Traffic signal preemption 2063: 2023: 1985: 1827: 1816: 1668: 1626:Right-in/right-out (RIRO) 1555: 1532:Single-point urban (SPUI) 1472: 1463: 1391: 1296: 1210: 1092: 1059: 1050: 979:Gillespie, W. M. (1850). 486:History of road transport 260:of roads for the Bristol 169:Laying Telford paving in 2379:Pavement condition index 2105:High-occupancy toll lane 2100:Contraflow lane reversal 2075:Barrier transfer machine 693:McAdam (1824), pp. 39–40 1233:Express-collector setup 652:"The Colossus of Roads" 504:Lay, Maxwell G (1992), 171:Aspinwall, Pennsylvania 2417:Road types by features 2312:Raised pavement marker 2279:Constant-slope barrier 2203:Traffic directionality 2193:Street running railway 1616:Protected intersection 853:The Right Road—and Why 722:, ElectricScotland.com 414: 296: 236: 174: 106:around 1820, in which 92: 2443:Industrial Revolution 2274:Concrete step barrier 1611:Offset T-intersection 716:"John Loudon MacAdam" 675:Lay (1992), pp. 76–77 427:Ernest Guglielminetti 412: 284: 234: 168: 78: 2448:Pavement engineering 2317:Road surface marking 2015:Single-vehicle crash 1738:Full depth recycling 1636:Seagull intersection 947:WSDOT Pavement Guide 702:McAdam (1824), p. 41 684:McAdam (1824), p. 38 443:Edgar Purnell Hooley 287:Nicolaus, California 19:For other uses, see 2453:Scottish inventions 2143:Pedestrian crossing 1706:Reinforced concrete 1542:Three-level diamond 1253:Two-lane expressway 1238:Farm-to-market road 958:on 13 December 2012 872:on 13 November 2013 750:on 27 November 2020 459:developed countries 417:With the advent of 391:Water-bound macadam 348:Boonsboro, Maryland 273:published in 1819. 2173:Runaway truck ramp 1995:Driver's education 1783:Rubberized asphalt 1718:Crocodile cracking 1641:Split intersection 1409:Hierarchy of roads 1370:Single carriageway 828:John Loudon McAdam 449:, was introduced. 415: 382:McAdam's influence 297: 285:A macadam road in 237: 235:John Loudon McAdam 175: 104:John Loudon McAdam 93: 2425: 2424: 2233:Wide outside lane 2059: 2058: 2036:Automotive safety 1917:Road slipperiness 1664: 1663: 1512:Diverging diamond 1459: 1458: 1375:Single-track road 1317:Bicycle boulevard 921:. 4 February 2021 720:Significant Scots 403:Tar-bound macadam 397:Richard Edgeworth 250:Scottish Lowlands 227:Advent of macadam 71: 70: 2460: 2269:Cat's eye (road) 2090:Complete streets 1862:Dead Man's Curve 1825: 1824: 1763:Pavement milling 1678:Asphalt concrete 1621:Quadrant roadway 1562: 1484: 1470: 1469: 1436:Street hierarchy 1084:Elevated highway 1057: 1056: 1034: 1027: 1020: 1011: 1010: 994: 992: 990: 967: 966: 965: 963: 937: 931: 930: 928: 926: 915: 909: 908: 907: 905: 891:Cavette, Chris, 888: 882: 881: 879: 877: 868:. 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1815: 1809: 1806: 1804: 1801: 1799: 1796: 1794: 1791: 1789: 1786: 1784: 1781: 1779: 1776: 1774: 1771: 1769: 1766: 1764: 1761: 1759: 1756: 1754: 1751: 1749: 1746: 1744: 1741: 1739: 1736: 1734: 1731: 1729: 1726: 1724: 1723:Crushed stone 1721: 1719: 1716: 1714: 1711: 1707: 1704: 1703: 1702: 1699: 1697: 1694: 1692: 1689: 1686: 1684: 1681: 1679: 1676: 1675: 1673: 1671: 1667: 1657: 1654: 1652: 1649: 1647: 1644: 1642: 1639: 1637: 1634: 1632: 1629: 1627: 1624: 1622: 1619: 1617: 1614: 1612: 1609: 1607: 1606:Michigan left 1604: 1602: 1599: 1597: 1594: 1592: 1589: 1587: 1584: 1582: 1579: 1577: 1574: 1572: 1569: 1568: 1566: 1563: 1558:Intersections 1554: 1548: 1545: 1543: 1540: 1538: 1535: 1533: 1530: 1528: 1525: 1523: 1520: 1518: 1515: 1513: 1510: 1508: 1507:Directional T 1505: 1503: 1500: 1498: 1495: 1493: 1490: 1489: 1487: 1482: 1476: 1471: 1468: 1466: 1462: 1452: 1449: 1447: 1444: 1442: 1439: 1437: 1434: 1430: 1427: 1425: 1424:special route 1422: 1421: 1420: 1417: 1415: 1412: 1410: 1407: 1405: 1402: 1400: 1397: 1396: 1394: 1390: 1384: 1381: 1378: 1376: 1373: 1371: 1368: 1366: 1363: 1360: 1358: 1355: 1353: 1350: 1348: 1345: 1343: 1342:Frontage road 1340: 1338: 1335: 1333: 1330: 1328: 1325: 1323: 1320: 1318: 1315: 1313: 1310: 1308: 1305: 1302: 1301: 1299: 1295: 1289: 1286: 1284: 1281: 1279: 1276: 1274: 1271: 1269: 1266: 1264: 1261: 1259: 1256: 1254: 1251: 1249: 1246: 1244: 1241: 1239: 1236: 1234: 1231: 1229: 1226: 1224: 1221: 1219: 1218:Arterial road 1216: 1215: 1213: 1209: 1203: 1202:United States 1200: 1198: 1195: 1193: 1190: 1188: 1185: 1183: 1180: 1178: 1175: 1173: 1170: 1168: 1165: 1163: 1160: 1158: 1155: 1153: 1150: 1148: 1145: 1143: 1140: 1138: 1135: 1133: 1130: 1128: 1125: 1123: 1120: 1118: 1115: 1113: 1110: 1108: 1105: 1103: 1100: 1099: 1097: 1095: 1091: 1085: 1082: 1080: 1077: 1075: 1072: 1070: 1067: 1066: 1064: 1062: 1058: 1055: 1053: 1052:Types of road 1049: 1045: 1042: 1035: 1030: 1028: 1023: 1021: 1016: 1015: 1012: 1006: 1003: 1002: 984: 983: 977: 976: 957: 953: 949: 948: 943: 936: 920: 914: 900: 899: 894: 887: 871: 867: 861: 854: 850: 845: 830: 829: 822: 820: 805: 803:0-7506-5090-7 799: 795: 794: 786: 771: 765: 749: 745: 739: 737: 721: 717: 711: 709: 699: 690: 681: 672: 658:, Strum.co.uk 657: 653: 646: 631: 630: 622: 613: 611: 609: 599: 597: 587: 585: 569: 565: 564: 559: 553: 544: 542: 535: 534:0-8135-2691-4 531: 519: 517:0-8135-1758-3 513: 509: 508: 500: 496: 487: 484: 483: 477: 475: 471: 467: 462: 460: 455: 450: 448: 444: 440: 436: 432: 428: 424: 420: 411: 407: 400: 398: 388: 379: 377: 371: 369: 365: 361: 357: 353: 349: 345: 338:North America 335: 331: 327: 325: 309: 307: 301: 288: 283: 274: 272: 268: 263: 259: 255: 251: 247: 233: 224: 221: 215: 212: 206: 204: 198: 195: 191: 187: 183: 182:Dumfriesshire 179: 172: 167: 158: 156: 152: 148: 144: 139: 137: 133: 129: 115: 113: 109: 108:crushed stone 105: 101: 98:is a type of 97: 90: 86: 82: 77: 73: 65: 62:November 2023 55: 49: 47: 42: 37: 33: 28: 27: 22: 2332:Traffic cone 2322:Rumble strip 2223:Truck bypass 2178:Shared space 2138:Passing lane 2123:Managed lane 2080:Bicycle lane 1962:Washboarding 1957:Traffic sign 1882:Hairpin turn 1757: 1651:Texas U-turn 1581:Box junction 1475:Interchanges 1419:Route number 1327:Country lane 1069:Bike freeway 987:. Retrieved 981: 960:, retrieved 956:the original 946: 935: 923:. Retrieved 913: 902:, retrieved 896: 886: 874:. Retrieved 870:the original 860: 849:Claudy, C.H. 844: 833:, retrieved 827: 807:, retrieved 792: 785: 773:. Retrieved 764: 752:. Retrieved 748:the original 724:, retrieved 719: 698: 689: 680: 671: 660:, retrieved 655: 645: 636:26 September 634:, retrieved 628: 621: 573:27 September 571:. Retrieved 562: 552: 521:, retrieved 506: 499: 466:Pennsylvania 463: 451: 416: 406: 394: 385: 372: 341: 332: 328: 310: 302: 298: 294: 1850s 270: 266: 243: 220:John Metcalf 216: 207: 199: 176: 140: 126: 118:Predecessors 95: 94: 72: 59: 43: 41:lead section 2370:Performance 2302:Kassel kerb 2259:Botts' dots 2247:Demarcation 1947:Storm drain 1912:Road debris 1837:Aquaplaning 1830:environment 1818:Road safety 1696:Cobblestone 1646:Superstreet 1451:Winter road 1399:Concurrency 1392:Other terms 1383:Sunken lane 1352:Main street 1297:Local roads 775:13 February 754:13 February 726:13 February 306:water table 240:John McAdam 155:cross slope 2432:Categories 2372:indicators 2341:Structures 2292:Guard rail 2168:Road verge 2041:Seat belts 1977:Snowsquall 1942:Speed bump 1922:Road train 1743:Glassphalt 1683:Bioasphalt 1656:Turnaround 1631:Roundabout 1561:(at-grade) 1527:Roundabout 1492:Cloverleaf 1347:Green lane 1283:Trunk road 1211:Main roads 1094:By country 925:4 February 656:Palimpsest 528:Paperback 492:References 368:Ohio River 344:Hagerstown 180:, born in 112:bituminous 85:Hagerstown 2163:Road diet 2065:Space and 2010:Road rage 1897:Oil spill 1857:Crosswind 1847:Black ice 1842:Avalanche 1768:Permeable 1601:Jughandle 1596:Hook turn 1502:Free-flow 1446:Toll road 1365:Side road 1322:Boulevard 1278:Super two 1273:Ring road 1248:Link road 1147:Hong Kong 1102:Australia 1044:hierarchy 942:"History" 356:Baltimore 203:brickwork 147:aggregate 81:Boonsboro 46:summarize 2351:Causeway 2188:Shoulder 2024:Vehicles 1972:Whiteout 1932:Rockfall 1927:Roadkill 1852:Bleeding 1828:Road and 1788:Sealcoat 1713:Corduroy 1701:Concrete 1691:Chipseal 1670:Surfaces 1522:Raindrop 1337:Driveway 1332:Dead end 1312:Backroad 1263:2+2 road 1258:2+1 road 1182:Portugal 1172:Pakistan 560:(1867). 480:See also 470:concrete 435:coal tar 364:Wheeling 352:Turnpike 324:carriage 194:Holyhead 186:Scotland 143:subgrade 89:Maryland 2438:Asphalt 2254:Bollard 2238:Woonerf 1967:Washout 1907:Pothole 1820:factors 1808:Texture 1778:Plastic 1758:Macadam 1547:Trumpet 1497:Diamond 1268:Parkway 1243:Highway 1157:Ireland 1137:Germany 1127:Croatia 1107:Belgium 989:23 June 962:19 June 904:19 June 876:31 July 835:18 June 809:18 June 662:18 June 523:18 June 474:runways 454:asphalt 366:on the 358:on the 317:⁄ 254:Bristol 173:in 1908 136:Limoges 96:Macadam 2347:Bridge 2031:Airbag 1803:Tarmac 1748:Gravel 1576:Bowtie 1517:Parclo 1441:Stroad 1404:Detour 1379:Street 1307:Avenue 1192:Taiwan 1177:Poland 1142:Greece 1117:Canada 1112:Brazil 898:eNotes 800:  532:  514:  447:tarmac 431:Monaco 211:gravel 151:camber 21:McAdam 1773:Plank 1687:Brick 1537:Stack 1303:Alley 1187:Spain 1167:Nepal 1162:Italy 1152:India 1122:China 2283:Curb 2114:Lane 1877:Ford 1793:Sett 1733:Dirt 1361:Road 1041:Road 991:2010 964:2010 927:2021 906:2010 878:2013 837:2010 811:2010 798:ISBN 777:2017 756:2017 728:2017 664:2010 638:2011 575:2011 530:ISBN 525:2010 512:ISBN 439:slag 346:and 132:road 100:road 83:and 1937:Rut 1872:Fog 1753:Ice 568:331 445:as 423:tar 362:to 246:Ayr 153:or 87:in 2434:: 950:, 944:, 895:, 818:^ 735:^ 718:, 707:^ 654:, 607:^ 595:^ 583:^ 540:^ 476:. 291:c. 289:, 184:, 157:. 1483:) 1479:( 1033:e 1026:t 1019:v 993:. 929:. 880:. 851:" 779:. 758:. 577:. 319:4 315:3 312:( 64:) 60:( 50:. 23:.

Index

McAdam

lead section
summarize
provide an accessible overview

Boonsboro
Hagerstown
Maryland
road
John Loudon McAdam
crushed stone
bituminous
Pierre-Marie-Jérôme Trésaguet
road
Limoges
subgrade
aggregate
camber
cross slope

Aspinwall, Pennsylvania
Thomas Telford
Dumfriesshire
Scotland
Commission of Highland Roads and Bridges
Holyhead
brickwork
gravel
John Metcalf

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