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2. Chain-link fencing - Wikipedia

   en.wikipedia.org/wiki/Chain-link_fencing

   A chain-link fence allows light to pass through while protecting windows. In the United States, fencing usually comes in 20-foot (6.1 m) or 50-foot (15 m) rolls, which can be joined by "unscrewing" one of the end wires and then "screwing" it back in so that it hooks both pieces.

3. Frank J. Mafera - Wikipedia

   en.wikipedia.org/wiki/Frank_J._Mafera

   In 1930, Mafera filed an application for a "method of forming wire fence fabric", which was approved in 1931. [1] Mafera's brother already owned a chain-link fence company in Medford, Massachusetts, [2] and Mafera's 1931 patent was one of the several advancements made by the Maferas in the development of chain-link fencing.

4. Split-rail fence - Wikipedia

   en.wikipedia.org/wiki/Split-rail_fence

   Simple split-rail fence Log fence with double posts (photo taken in 1938). A split-rail fence, log fence, or buck-and-rail fence (also historically known as a Virginia, zigzag, worm, snake or snake-rail fence due to its meandering layout) is a type of fence constructed in the United States and Canada, and is made out of timber logs, usually split lengthwise into rails and typically used for ...

5. Interstate Highway standards - Wikipedia

   en.wikipedia.org/wiki/Interstate_Highway_standards

   Longer bridges can reduce the width of both shoulders to 4 feet (1.2 m). Existing bridges can remain part of the Interstate system if they have at least 12-foot-wide (3.7 m) lanes with 3.5-foot (1.1 m) shoulder on the left and a 10-foot (3.0 m) shoulder on the right, except that longer bridges can have 3.5 feet (1.1 m) shoulders on both sides.

6. Fence - Wikipedia

   en.wikipedia.org/wiki/Fence

   A fence is a structure that encloses an area, typically outdoors, and is usually constructed from posts that are connected by boards, wire, rails or netting. [1] A fence differs from a wall in not having a solid foundation along its whole length. [2] Alternatives to fencing include a ditch (sometimes filled with water, forming a moat).

7. Four-quadrant gate - Wikipedia

   en.wikipedia.org/wiki/Four-quadrant_gate

   A four-quadrant gate or full-barrier equipment is a type of boom barrier gate protecting a grade crossing. It has a gate mechanism on both sides of the tracks for both directions of automotive traffic. The exit gates blocking the road leading away from the tracks are equipped with a delay, and begin their descent to their horizontal position ...

8. Chain (unit) - Wikipedia

   en.wikipedia.org/wiki/Chain_(unit)

   One link is a hundredth part of a chain, which is 7.92 inches (20.1168 cm). [7] The surveyor's chain first appears in an illustration in a Dutch map of 1607, [8] and in an English book for surveyors of 1610. [9] In 1593 the English mile was redefined by a statute of Queen Elizabeth I as 5,280 feet, to tie in with agricultural practice.

9. Cattle grid - Wikipedia

   en.wikipedia.org/wiki/Cattle_grid

   Cattle grid on country road. Cattle grids are usually installed on roads where they cross a fenceline, often at a boundary between public and private lands. [5] They are an alternative to the erection of gates that would need to be opened and closed when a vehicle passes, and are common where roads cross open moorland, rangeland or common land maintained by grazing, but where segregation of ...