Cattle grid

The modern cattle grid for roads used by automobiles is said to have been independently invented a number of times on the Great Plains of the United States around 1905–1915. Before that period, a similar device for railroads was in use at least as early as 1836; a stone stile was used in Britain as far back as pre-Roman times.{{citation|contributor-first=James F.|contributor-last= Hoy|contribution=Cattle Guards|title=Encyclopedia of the Great Plains|author1-link=David J. Wishart|author=David J. Wishart|publisher=University of Nebraska Press |year=2004|page=292|isbn=9780803247871|url=https://books.google.com/books?id=rtRFyFO4hpEC&pg=PA292}} An article in Texas Monthly claims that the "first recorded use of a cattle grid for nonrail traffic" occurred in 1881 in Archer County, Texas, on the stagecoach road between Archer City and Henrietta.{{cite journal|last=Webre|first=Rodney|title=Texas Primer: The Cattle Guard|journal=Texas Monthly|date=May 1984|url=http://www.texasmonthly.com/the-culture/texas-primer-the-cattle-guard/|access-date=May 25, 2016}}

File:Cattle grid in Israel.jpg

Cattle grids are usually installed on roads where they cross a fenceline, often at a boundary between public and private lands.{{Cite web |date=2019-02-25 |title=Everything You Need to Know About Cattle Grids |url=https://www.farmranchstore.com/information/2019/2/20/everything-you-need-to-know-about-cattle-grids |access-date=2023-09-21 |website=FarmRanchStore.com |language=en-US}} 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 fields is impractical. Cattle grids are also used when otherwise unfenced railways cross a fenceline. Cattle grids are common worldwide and are widespread 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. In the United States, they are often used on Bureau of Land Management and Forest Service land, but are also used on paved roads and entry and exit ramps of the Interstate Highway System in rural areas. In Lapland, cattle grids are also used to prevent free-range reindeer from entering fenced areas such as road areas or lumber yards or crossing international borders.

Almost all cattle grids are built around a grid. Most include a pit dug along a fence line, a base for the grid to rest on, and wings to connect the guard to the fence. Since many guards were or are home-made and to some degree idiosyncratic, a wide variety of designs exist. Designs may vary with local conditions. Materials used for construction of a cattle grid depend partly on the weight it must bear.Hoy, pp. 112–116

A study of the bars of traditional cattle grids in the Flint Hills of Kansas found that 80 percent were made of pipe, while smaller percentages were made of railroad rails, I-beams, planks, and other materials. The size of the bars varied from {{convert|1+1/2|to|6+1/2|in|mm|order=flip}}; the spaces between bars varied from {{convert|1+3/4|to|8|in|mm|order=flip}}; the number of bars per grid varied from 4 to 22. Grids differed in length from {{convert|7+3/4|to|30|ft|m|order=flip}} and in width from {{convert|40|to|120|in|m|order=flip}}, while the pits beneath grids were {{convert|0|to|98|in|m|order=flip}} deep.

Cattle grids, as they are called in Great Britain, Ireland, and South Africa, are known by a wide variety of other names in other parts of the world. In the United States, they are cattle guards. {{lang|pt|Mata burro}} ('donkey killer') is the preferred name in Brazil and Venezuela, while {{lang|es|guarda ganado}} ('cattle keeper') is what they are called in Argentina. Alternatives in the United States include car crossing, auto gate, corduroy gate, stock gap, cattle pass, run-over, and many others. Canadians use pit gate, vehicle pass, and Texas gate, as well as cattle guard, which in Canada refers mainly to guards at railway lines.Hoy, pp. 117–18

Cattle grids made entirely or mostly of concrete have existed since the 1940s.{{cite book|last=Hoy|first=James F.|title=The Cattle Guard: Its History and Lore|publisher=University of Kansas Press|location=Lawrence|year=1982|pages=145–46|isbn=978-0-7006-0226-1}} Individual ranchers have often constructed their own, sometimes using plans developed in the 1940s. In the 21st century, a set of plans for do-it-yourself guards made of wood and concrete are available via the web site of the Missouri Alternatives Center at the University of Missouri in the US.{{cite web|author=University of Tennessee|title=Fence and Cattle Guard Plans: Cattle Guards, Wood Frame and Concrete|url=http://agebb.missouri.edu/mac/links/linkview3.asp?catnum=123&linknum=7204|archive-url=https://web.archive.org/web/20180828035626/http://agebb.missouri.edu/mac/links/linkview3.asp?catnum=123&linknum=7204|url-status=dead|archive-date=August 28, 2018|publisher=University of Missouri|year=2014|orig-year=1968|access-date=June 4, 2016}} Commercial precast concrete versions are also available; Smith Cattleguard Company, based in Virginia, sold more than 15,000 of them between 1960 and 1980. Manufacturers also produce commercial polyethylene forms with reinforcing rods. Placed in or on the ground and filled, a finished cattle grid with {{convert|4000|psi|MPa|adj=on}} concrete reinforced with {{convert|5/8|in|adj=on}} fiberglass (GFRP) rebar can support vehicle loads of up to {{convert|32000|lb|t}} per axle.{{cite web|last=Hendricks|first=Walt|title=Cattle Guard Forms|url=http://cattleguards.org/cattle-guard-forms/|work=Cattle Guards website|publisher=Ray Allen|access-date=20 November 2012}}

University Lands, which manages land and mineral interests for a foundation supporting the University of Texas and Texas A&M University systems, publishes do-it-yourself manuals for three sizes of cattle grids with grids made of steel pipes. The manuals include schematic drawings as well as accompanying instructions.{{cite web|title=Best Practices: Cattle Guards & Cattle Guard Specifications|year=2011|url=http://www.utlands.utsystem.edu/surface/Cattleguards.aspx|publisher=University Lands|access-date=June 13, 2016}} Commercial guards made of steel are also available from multiple companies.{{cite web|title=Cattle Guards and Drive Through Gates|publisher=University of Wisconsin – Extension|url=http://fyi.uwex.edu/agrability/files/2010/02/Cattle-Guards-and-Drive-Through-Gates.pdf|access-date=June 13, 2016|archive-url=https://web.archive.org/web/20150919231221/http://fyi.uwex.edu/agrability/files/2010/02/Cattle-Guards-and-Drive-Through-Gates.pdf|archive-date=September 19, 2015|url-status=dead}}

Image:Lone Pine, CA Virtual Cattle Guard.jpg]]

Painted lines on the road can serve as skeuomorphs of cattle grids. The light-dark pattern of lines on pavement resembles a true cattle grid to animals, and by association think they will not be able to cross. Using a virtual cattle grid is initially cheaper than a true cattle grid,{{cite web|last1=Sheldrake|first1=Rupert|title=Cattle Fooled by Phoney Grids|url=http://www.sheldrake.org/research/morphic-resonance/cattle-fooled-by-phoney-grids|website=sheldrake.org|access-date= June 3, 2016}} but the cost of periodic re-painting may eventually exceed the initial cost of a well-built metal guard.Hoy, p. 153 A particular advantage of painted guards is that they are smooth to drive over; in the US, most are found on state or federal highways, rather than private roads.

Why they work is unclear, but it is most likely related to the bovine visual system. Experts say that "a cow's depth perception is such that it makes little or no distinction between painted stripes on a dark background and bars over a pit."Hoy, p. 154 Cattle may acquire the behavior of avoiding grids over pits either from individual experience or through imitation of other cattle. However, painted grids have been reported to work with semi-wild cattle with no prior exposure to virtual grids.

Cattle can sometimes defeat virtual guards. A station owner in Queensland, Australia, told a reporter that after some of his old bulls leaped a painted grid, the younger ones lost their fear of walking across.{{cite news |url=http://www.abc.net.au/news/2005-07-28/virtual-cattle-grids-outsmart-nt-cattle/2068508|title=Virtual Cattle Grids Outsmart NT Cattle|publisher= Australian Broadcasting Company|date=July 28, 2005|access-date=June 17, 2010}} This is common; if one member of a herd discovers it can step safely on the lines, others will follow. Other incentives that lead cattle to test a virtual guard include placing food on the opposite side, or using strong driving pressure to run panicked cattle over a virtual grid.

Electric cattle grids use electricity to deter animals from crossing the fence line. There are different designs. One uses high-tensile wire run across the roadway, about {{convert|3|to|4|in|cm|sigfig=1}} off the ground, attached to a power source on one side.{{cite web|last1=Ford|first1=Devlon|title=Electric Cattle Guard Saves Time|url=http://www.noble.org/ag/research/electric-cattle-guard/|publisher=Samuel Roberts Noble Foundation|access-date=June 3, 2016|date=July 23, 2013}} The primary advantage is cost and ease of installation.{{Cite news |last=Ford |first=Devlon |date=2013-07-13 |title=Electric Cattle Guard Saves Time – Noble Research Institute |language=en-US |work=Noble Research Institute |url=https://www.noble.org/regenerative-agriculture/livestock/electric-cattle-guard-saves-time/ |access-date=2023-09-21}} Drawbacks include the necessity of spraying vegetation with herbicides to keep weeds from shorting out the grid if there is no barrier between the wires and the ground. In addition, some low-riding vehicles can catch the wires and tear them out.

James Hoy in The Cattle Guard discusses four kinds of electric guards. One that was patented in Illinois in 1955 and another invented in New Zealand in 1979 are similar; each resemble "something like the framework of an old-fashioned metal bed" connected to a battery or high-powered fence charger. They are easy to drive across, but may pose a danger to children or animals that get stuck in the guard.Hoy, p. 152 Another type was patented in two versions by an Oregon inventor in 1956–57; it consisted of 20 current-carrying synthetic rubber strips mounted on a wooden frame. The invention proved highly effective in deterring all animals, including dogs, and it was maintenance free, easy to drive over, and safe. However, the company that acquired the manufacturing rights stopped production in 1960. A fourth type, homemade, consists of two sections of woven wire or steel plate laid on a concrete slab and set apart from one another on either side of a fenceline. The wire sections are then connected to an electric fence or to a separate charger, either conventional or solar-powered.

File:Cow crosses cattle grid.webm

While cattle grids are most effective on cattle, they can be used to exclude deer and elk.{{cite web|title=Wildlife-Human Issues: Living with Wildlife: Deer|publisher=Maine Department of Inland Fisheries and Wildlife (adapted from Washington State Department of Fish and Wildlife Living With Wildlife in the Pacific Northwest by Russell Link)|last1= Link|first1 = Russell (Maine DFW)|last2=Beausoleil|first2=Rick|last3=Spencer|first3=Rocky (Washington DFW) |year=2005|url=http://www.maine.gov/ifw/wildlife/human/lww_information/deer.html|access-date=May 23, 2016|quote=Some people consider cattle guards eyesores, but these ground-level installations provide the most effective protection for ungated driveways on properties that are otherwise fenced to keep deer out.}}{{cite journal|title=Wildlife Crossings|date=June 2008|journal=Backpacker|volume=37|number=5|page=40|url=https://books.google.com/books?id=OHBTuhqm5-sC&pg=PA40|access-date=May 27, 2016|via=Google Books}}{{cite book|title=White-Tailed Deer Habitat: Ecology and Management on Rangelands|first1=José Alfonso |last1=Ortega-Santos|first2=Timothy Edward |last2=Fulbright|publisher=Texas A&M University Press|year=2013|isbn=9781603449724|page=147|url=https://books.google.com/books?id=kdo9y88VR58C&pg=PA147|via=Google Books|access-date=December 26, 2016}} Research has shown that deer can cross cattle grids with flat, as opposed to rounded bars.{{citation|title=Comparison of Electrified Mats and Cattle Guards to Control White Tailed Deer (Odocoileus virginianus) Access through Fences|first1=Thomas W. |last1=Seamans|first2=David A. |last2=Helon|work=Proc. 23rd Vertebr. Pest Conf.|editor=R. M. Timm |editor2=M. B. Madon|publisher=Univ. of Calif., Davis.|year= 2008|pages= 206–209|via=United States Department of Agriculture|url=http://naldc.nal.usda.gov/download/23401/PDF|quote=Comparisons of other cattle guard studies show that when flat material is used instead of rounded for cross members, deer cross the guard.}} Sometimes a cattle grid is doubled to exclude these animals. A cattle grid requiring a horizontal leap of {{convert|14|ft}} is considered effective when combined with a deer fence.{{citation|title=Deer-Resistant Landscaping: Proven Advice and Strategies for Outwitting Deer and 20 Other Pesky Mammals|first=Neil |last=Soderstrom|publisher=Rodale|year=2009|page=50|url=https://books.google.com/books?id=FPeHoJL4MC0C&pg=PA50|isbn=9781605296678}} Striping is also painted on roads as a visual deterrent to deer, as with "virtual" cattle grids.{{cite news|title=Interstate 70 Ramps Between Rifle, Canyon Creek to Be Affected by Fencing Project|date=July 31, 2013|newspaper=Post Independent – Citizen Telegram|publisher=Swift Communications|location=Rifle, Colorado|url=http://www.postindependent.com/news/7529218-113/ramps-wildlife-deer-fence|access-date=May 23, 2016|archive-url=https://web.archive.org/web/20130815035356/http://www.postindependent.com/news/7529218-113/ramps-wildlife-deer-fence|archive-date=August 15, 2013|url-status=dead}}

Image:Sheep escape cattle grid.jpg

While these barriers are usually effective for cattle, they can fail due to ingenious animals. Sheep searching for food have been known to jump across grids, step carefully into the spaces,{{cite video|title=Sheep Escaping|last=Marchington|first=James|url=https://www.youtube.com/watch?v=5rIbZWblPaA |archive-url=https://ghostarchive.org/varchive/youtube/20211222/5rIbZWblPaA |archive-date=2021-12-22 |url-status=live|publisher=YouTube|date=April 17, 2013|access-date=June 5, 2016}}{{cbignore}} or run along the side of grids as wide as {{convert|8|ft|m|1}}.{{cite news|title=Crafty Sheep Conquer Cattle Grids|url=http://news.bbc.co.uk/1/hi/uk/3938591.stm|work=BBC News|date=July 30, 2004|access-date= October 3, 2014}}

Wider grids are used where wildlife is to be contained. Some animals can jump across them, and a barrier that stops deer needs to be at least {{convert|16|ft|0}} wide. Bison, and bulls in particular can easily jump across an {{convert|8|ft|m|adj=on}} barrier, and have been known to jump widths of up to {{convert|14|ft|m}}.{{cite book|last1=Ballard|first1=Jack|title=Bison|date=2013|publisher=Globe Pequot Press|location=Guilford, Connecticut| page=30|isbn=978-0-7627-8101-0|url=https://books.google.com/books?id=mAQtLgzVbJgC&pg=PA30|access-date=May 25, 2016}}{{cite book|last1=Lott|first1=Dale F.|title=American Bison: a Natural History.|date=2002|publisher=University of California Press|location=Berkeley|isbn=978-0-520-24062-9|page=[https://archive.org/details/americanbisonnat0000lott/page/42 42]|url=https://archive.org/details/americanbisonnat0000lott|url-access=registration|access-date=May 25, 2016}}

In areas with heavy snowfall and long periods without a thaw, snow can accumulate beneath a grid and allow animals to walk across.

Horses are particularly vulnerable to cattle grid injuries, as their single-toed hooves can slip between the bars and trap their legs in an easily broken position.{{cite web|author=Rob|title=Cattle Guards Can Be Dangerous to Some Animals|url=http://www.barnworld.com/blog/cattle-guard/cattle-guards-can-be-dangerous-to-some-animals|publisher=Barn World|date=July 23, 2012|access-date=June 5, 2016}} The same risk exists for kangaroos in Australia's outback, with additional risk of entrapment.{{cite news|last=Hooper|first=Ben|title=Australian Dad Pulls Upside-Down Kangaroo out of Roadside Grate|url=http://www.upi.com/Odd_News/2016/08/01/Australian-dad-pulls-upside-down-kangaroo-out-of-roadside-grate/1791470064304/|publisher=United Press International|date=August 1, 2016|access-date=December 26, 2016}}

Cattle grids are generally useless for containing goats. However, a Texas Highway Department official reported that adding three {{convert|20|in|cm|adj=on}} painted stripes—arranged yellow, white, yellow—on the road in front of a cattle grid deterred goats from approaching or crossing the guard.Hoy, p. 155

Cattle grids produce noise when vehicles pass over them and people living in a 100 m radius from the grid can be affected.{{Cite web |last=Watts |first=G.R |date=2023-09-21 |title=Investigations of noise and disturbance from vehicles crossing cattle grids and examination of options for mitigation |url=https://www.researchgate.net/publication/322772693 |access-date=2023-09-21 |website=ResearchGate}}{{Cite web |date=2016-09-26 |title=Noisy cattle grids threaten a good night's sleep |url=https://www.bradford.ac.uk/news/archive/2016/noisy-cattle-grids-threaten-a-good-nights-sleep.php |access-date=2023-09-21 |website=University of Bradford |language=en}}

The United States Patent and Trademark Office (US PTO) issued patent {{US patent|1125095A}} on January 15, 1915, to William J. Hickey, Reno, Nevada, for a cattle grid.{{cite web|title=Cattle-guard|publisher=United States Patent and Trademark Office|date=January 19, 1915|url=https://patents.google.com/patent/US1125095|via=Google Patents|access-date=May 27, 2016}}

There is a British Standard for cattle grids: BS4008:2006.{{cite web|title=Specification for Cattle Grids|url=http://shop.bsigroup.com/ProductDetail/?pid=000000000030144002|publisher=British Standards Institution|date=April 28, 2006|access-date=June 14, 2016}} The US standards are put forth by The American Association of State Highway and Transportation Officials (AASHTO). AASHTO provides load rating guidelines for cattle grids that are used on public roads in the US. All cattle grids used on US public roads must be certified by a qualified engineer that the grid meets AASHTO guidelines.{{cite web |title=Information About Cattle Guards|url=http://www.cattle-guards.com/|publisher = Barn World Farm & Ranch Superstore |access-date=June 17, 2010}}

• Anti-trespass panels, rubber and wooden surfaces meant to deter walking on or near rail tracks, derived from cattle grids
• Bus trap
• Bump gate
• Ha-ha

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{{wiktionary|cattle grid}}

Category:Road infrastructure

Category:Livestock