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Macadam is a type of road construction pioneered by Scottish engineer John Loudon McAdam c. 1820, in which crushed stone 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 bituminous binder to ...
John Loudon McAdam, 1830, National Gallery, London. John Loudon McAdam (23 September 1756 [1] – 26 November 1836) was a Scottish civil engineer and road-builder. He invented a new process, "macadamisation", for building roads with a smooth hard surface, using controlled materials of mixed particle size and predetermined structure, that would be more durable and less muddy than soil-based tracks.
Tarmacadam is a concrete road surfacing material made by combining tar and macadam (crushed stone and sand), patented by Welsh inventor Edgar Purnell Hooley in 1902. It is a more durable and dust-free enhancement of simple compacted stone macadam surfaces invented by Scottish engineer John Loudon McAdam in the early 19th century.
The National Road (also known as the Cumberland Road) [1] was the first major improved highway in the United States built by the federal government.Built between 1811 and 1837, the 620-mile (1,000 km) road connected the Potomac and Ohio Rivers and was a main transport path to the West for thousands of settlers.
The first segment of modern MD 212 to be built as a modern road was Riggs Road from Washington to the Adelphi Mill, which was then known as the Riggs Mill. The 14-foot-wide (4.3 m) macadam road was built in two sections, the first one from Ager Road near the modern MD 410 intersection to Northwest Branch opposite the Riggs Mill by 1910.
[5] [6] The Uniontown Road from New Windsor to near the modern MD 75–MD 84 junction was paved in macadam as a state aid road in 1911. [5] The highway was extended south as a state-aid road from Fountain Mills toward Hyattstown in two sections; the first 1.5-mile (2.4 km) section was completed as a macadam road by 1915. [6]
The macadam road was extended to Kensington by 1927. [5] MD 192's original western terminus was at St. Paul Avenue, which was the original course of MD 193. [6] The highway was extended west along Metropolitan Avenue and Plyers Mill Road—MD 193 (now MD 185) was relocated around the center of Kensington after its grade separation of the ...
The first two sections of MD 17 to be constructed were Petersville Road from downtown Brunswick to what is now Rosemont Drive in Rosemont and Burkittsville Road from what is now MD 180 to Coatsville, which were completed as 14-foot (4.3 m) wide macadam roads in 1916. [3]