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  2. Gravel road - Wikipedia

    en.wikipedia.org/wiki/Gravel_road

    A gravel road in Asikkala, Finland. A gravel road is a type of unpaved road surfaced with gravel that has been brought to the site from a quarry or stream bed.Gravel roads are common in less-developed nations, and also in the rural areas of developed nations such as Canada and the United States.

  3. Washboarding - Wikipedia

    en.wikipedia.org/wiki/Washboarding

    Washboarding effect on a road. Washboarding or corrugation [1] is the formation of periodic, transverse ripples in the surface of gravel and dirt roads.Washboarding occurs in dry, granular road material [2] with repeated traffic, traveling at speeds above 8.0 kilometres per hour (5 mph). [3]

  4. Dirt road - Wikipedia

    en.wikipedia.org/wiki/Dirt_road

    Cattle on a dirt road in Paraguay.. A dirt road or track is a type of unpaved road not paved with asphalt, concrete, brick, or stone; [1] made from the native material of the land surface through which it passes, known to highway engineers as subgrade material.

  5. Program available to reduce unpaved roads' erosion - AOL

    www.aol.com/news/program-available-reduce...

    For premium support please call: 800-290-4726 more ways to reach us

  6. Urban runoff - Wikipedia

    en.wikipedia.org/wiki/Urban_runoff

    Roads and parking lots are major sources of polycyclic aromatic hydrocarbons (PAHs), which are created as the byproducts of the combustion of gasoline and other fossil fuels, as well as of the heavy metals nickel, copper, zinc, cadmium, and lead. Roof runoff contributes high levels of synthetic organic compounds and zinc (from galvanized gutters

  7. Answer Man: Unpaved trails to connect Asheville ... - AOL

    www.aol.com/answer-man-unpaved-trails-connect...

    The project is called AVL Unpaved, a community-supported initiative with the goal of "building a network of multi-use natural surface trails that will help Asheville-area residents and visitors ...

  8. Road surface - Wikipedia

    en.wikipedia.org/wiki/Road_surface

    A road of such material is called a "metalled road" in Britain, a "paved road" in Canada and the US, or a "sealed road" in parts of Canada, Australia and New Zealand. [ 48 ] A granular surface can be used with a traffic volume where the annual average daily traffic is 1,200 vehicles per day or less.

  9. Bitumen - Wikipedia

    en.wikipedia.org/wiki/Bitumen

    In the horse-drawn era, US streets were mostly unpaved and covered with dirt or gravel. Especially where mud or trenching often made streets difficult to pass, pavements were sometimes made of diverse materials including wooden planks, cobble stones or other stone blocks, or bricks. Unpaved roads produced uneven wear and hazards for pedestrians.