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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.
Map of Roman roads in 125CE Road construction, depicted on Trajan's Column. With the advent of the Roman Empire, there was a need for armies to be able to travel quickly from one area to another, and the roads that existed were often muddy, which greatly delayed the movement of large masses of troops. To solve this problem, the Romans built ...
In the early 2000s, Oklahoma was 48th in the nation for bridge conditions. Today, the state ranks in the top 10 nationally for good bridge conditions. How Oklahoma has turned around and fixed ...
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.
By March 1, 1930, the department name had been modified slightly to simply the Oklahoma Department of Highways. [9] In 1976, the Oklahoma Legislature restructured the Department of Highways as an overall coordinating agency for the state's highways, railways and waterways and renamed to the Oklahoma Department of Transportation.
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