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This type of max clearance sign is typically mounted directly on the building in front of an entrance. They can also be mounted on custom steel or aluminum frames anchored to a soffit or overhang.

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Traffic cones are typically used outdoors during road work or other situations requiring traffic redirection or advance warning of hazards or dangers, or the prevention of traffic. For night time use or low-light situations traffic cones are usually fitted with a retroreflective sleeve to increase visibility. On occasion, traffic cones may also be fitted with flashing lights for the same reason.

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In the United States on May 1, 1959, the Pacific Gas and Electric Company in Oakland, California adopted the policy of placing orange safety cones at the left front and left rear corners of their service trucks while parked on the street to increase visibility and safety for the workers. This policy was implemented as the result of a suggestion by their employee, Russell Storch, a cable splicer. He was awarded $45 for his suggestion. This policy is still in use today.[9]

Bars are designed to hang down from a soffit, garage entrance, or a frame that spans the driveway. They are installed using chain and commercial sign brackets, and are designed to swing if hit at low speeds to alert the driver that their vehicle is too high.

Cones are easy to move or remove. Where sturdier (and larger) markers are needed, construction sites use traffic barrels (plastic orange barrels with reflective stripes, normally about the same size as a 55-US-gallon (46 imp gal; 208 L) drum). When a lane closure must also be a physical barrier against cars accidentally crossing it, a Fitch barrier, in which the barrels are filled with sand, or a Jersey barrier is used.

Traffic cones are designed to be highly visible and easily movable. Various sizes are used, commonly ranging from around 30 cm (11.8 in) to a little over 1 m (39.4 in). Typical traffic cones are fluorescent "safety" orange, but other bright colors including yellow, pink, red, and lime green are also used, with the color depending on context in some countries. The cones usually have a retroreflective strip (commonly known as "flash tape") to increase their visibility at night.

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Traditionally, but unofficially, the Wellington Statue in Glasgow is decorated with a traffic cone. The presence of the cone is given as the reason the statue is in the Lonely Planet 1000 Ultimate Sights guide (at number 229) as a "most bizarre monument".[14]

Being distinctive, easily portable and usually left unguarded, traffic cones are often stolen. Students are frequently blamed, to the extent that the British National Union of Students has attempted to play down this "outdated stereotype".[11]

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Our Slow Down for Children Signs are bright, with great visibility, and alert drivers to be wary of children that might appear unexpectedly in the road.

In the US, cones are required by the US Federal Highway Administration's Manual on Uniform Traffic Control Devices (MUTCD) to be fitted with reflective white bands to increase night-time visibility. Reflective collars, white strips made from white reflective plastic, slip over cones snugly, and tape or adhesive can be used to permanently attach the collars to the cones.

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Maximum clearance signs are made of alupanel with bright black and yellow vinyl graphics showing the clearance available in imperial and metric.

In 2007, artist Dennis Oppenheim commemorated the traffic cone with a monumental sculpture of five 20' (six metre) tall cones. They were installed temporarily in Miami,[12] Seattle's Olympic Sculpture Park,[13] and Seoul, Korea.

Traffic cones were invented by Charles D. Scanlon, an American who, while working as a painter for the Street Painting Department of the City of Los Angeles, was unimpressed with the traditional wooden tripods and barriers used to mark roads which were damaged or undergoing repainting. Scanlon regarded these wooden structures as easily broken, hard to see, and a hazard to passing traffic.[4] Scanlon's rubber cone was designed to return to an upright position when struck by a glancing blow. The patent for his invention was granted in 1943.[5][6]

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Traffic cones were first used in the United Kingdom in 1958, when the M6 motorway opened. These traffic cones were a substitute for red lantern paraffin burners being used during construction on the Preston Bypass.[7] In 1961, David Morgan of Burford, Oxfordshire, UK believes that he constructed the first experimental plastic traffic cones, which replaced pyramid-shaped wooden ones previously used.[8]

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Cones are also frequently used in indoor public spaces to mark off areas which are closed to pedestrians, such as a restroom being out of order, or to denote a dangerous condition, such as a slippery floor. They can be used on school playgrounds to limit areas of a playing field, and on ice rinks to define class, private party, or private lesson areas. Some of the cones used for this purpose are miniature, as small as 5 cm (2.0 in) tall, and some are disposable full-size cones made of biodegradable paper.

Modern traffic cones are usually made of brightly colored thermoplastic. PVC from bottles can be recycled to make traffic cones.[10]

An oxidising agent is a substance that acquires electrons. The oxidizing agent is said to have been reduced since it is trying to obtain electrons.

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In many countries such as Australia and in some American states such as California, traffic barrels are rarely seen; pillar-shaped moveable bollards are instead used where larger and sturdier warning or delineation devices are needed. Typically, bollards are 1,150 mm (45 in) high fluorescent orange posts with reflective sleeve and heavyweight rubber bases. Larger devices such as barrier boards may be used instead of cones where larger areas need to be excluded or for longer periods.

Traffic cones, also called pylons, witches' hats,[1][2] road cones, highway cones, safety cones, caution cones, channelizing devices,[3] construction cones, roadworks cones, or just cones, are usually cone-shaped markers that are placed on roads or footpaths to temporarily redirect traffic in a safe manner. They are often used to create separation or merge lanes during road construction projects or automobile accidents, although heavier, more permanent markers or signs are used if the diversion is to stay in place for a long period of time.