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cattle grid
A cattle grid (UK English), also known as a stock grid in Australia; cattle guard in American English; and vehicle pass, Texas gate, or stock gap in the U.S. Southeast; or a cattle stop in New Zealand English – is a type of obstacle used to prevent livestock, such as sheep, cattle, pigs, horses, or mules from passing along a road or railway which penetrates the fencing surrounding an enclosed piece of land or border. It consists of a depression in the road covered by a transverse grid of bars or tubes, normally made of metal and firmly fixed to the ground on either side of the depression, such that the gaps between them are wide enough for animals' legs to fall through, but sufficiently narrow not to impede a wheeled vehicle or human foot. This provides an effective barrier to animals without impeding wheeled vehicles, as the animals are reluctant to walk on the grates.
==Use==
Cattle grids are usually installed on roads where they cross a fenceline, often at a boundary between public and private lands. They are an alternative to the erection of gates that would need to be opened and closed when a vehicle passed, and are common where roads cross open moorland, rangeland or common land maintained by grazing, but where segregation of fields is impractical. Cattle grids are also used when otherwise unfenced railways cross a fenceline. Cattle grids are seen throughout the world and quite common in places such as Australia, the Scottish Highlands, or the National Parks of England and Wales. They are also common throughout the Western United States and Canada, where they are usually called a ''cattle guard'' or, occasionally, a ''Texas gate''. In the US, they are often used on BLM and Forest Service land, but are also used on paved roads and exit ramps of the Interstate Highway System in rural areas.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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