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improved subgrade

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  • History of road transport — The history of road transport started with the development of tracks by humans and their beasts of burden. Early roads The first forms of road transport were horses, oxen or even humans carrying goods over tracks that often followed game trails,… …   Wikipedia

  • airport — airport1 /air pawrt , pohrt /, n. a tract of land or water with facilities for the landing, takeoff, shelter, supply, and repair of aircraft, esp. one used for receiving or discharging passengers and cargo at regularly scheduled times. [1915 20;… …   Universalium

  • railroad — /rayl rohd /, n. 1. a permanent road laid with rails, commonly in one or more pairs of continuous lines forming a track or tracks, on which locomotives and cars are run for the transportation of passengers, freight, and mail. 2. an entire system… …   Universalium

  • Asphalt concrete — Asphalt concrete. As shown in this cross section, many older roadways are …   Wikipedia

  • Railroad tie — While wooden ties dominate North American railways, concrete is widely used in other parts of the world. A railroad tie/railway tie (North America), or railway sleeper (Europe) is a rectangular item used to support the rails in railroad tracks.… …   Wikipedia

  • Infrastructure — Public infrastructure Assets and facilities Airports · Bridges · Broadband …   Wikipedia

  • Dirt road — Cattle block a dirt road in Paraguay. Dirt road is a common term for an unpaved road made from the native material of the land surface through which it passes, known to highway engineers as subgrade material. Dirt roads are suitable for vehicles; …   Wikipedia

  • Road — This article is about a route, thoroughfare or way that supports travel by a means of conveyance. For a place outside a harbor where a ship can lie at anchor, see Roadstead. For public roads, see Highway. For other routes, see thoroughfare. For… …   Wikipedia

  • Soil cement — is a construction material , a mix of pulverized natural soil with small amount of portland cement and water, usually processed in a tumble, compacted to high density. Hard, semi rigid durable material is formed by hydration of the cement… …   Wikipedia

  • Cold Regions Research and Engineering Laboratory — Established 1 February 1961 (1 February 1961) Research Type …   Wikipedia

  • Landing at Saidor — Part of World War II, Pacific War Troops of t …   Wikipedia

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