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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.
[5] [8] Bucklodge Road from MD 28 near Dawsonville north to the Baltimore and Ohio Railroad (now CSX) was constructed as a 9-foot-wide (2.7 m) macadam road by Montgomery County with state aid by 1915. [8] Bucklodge Road was extended as a concrete road to the underpass of the railroad at Boyds east of the southern end of MD 121 in 1928. [9]
The macadam road was extended south to what is today the MD 117 intersection in what was called Old Germantown in 1923. [5] MD 118 was extended south as a concrete road from Old Germantown to Black Rock Road in 1930. [6] The highway was completed when the concrete road was extended to MD 28 at Darnestown in 1934.
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 first segment of MD 121 was constructed as a macadam road from Clarksburg to north of Tenmile Creek by 1910. [3] [4] The highway was extended south as a 14-foot-wide (4.3 m) macadam road south to Boyds by 1915. [5] [4] Both stretches of the Boyds–Clarksburg road were built by Montgomery County with state aid.
Maryland Route 17 (MD 17) is a state highway in the U.S. state of Maryland.The state highway begins at the Virginia state line at the Potomac River in Brunswick, where the highway continues south as Virginia State Route 287 (SR 287).
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.