Traffic conemeaning slang

Traffic cones are a common sight on highways, streets, parking lots, and work and construction sites.  They are used to designate “no access” areas and to provide motorists, pedestrians, and workers with warnings regarding the danger of entering these areas. They are popularly understood and accepted and are thus an effective way of re-directing vehicle or foot traffic around specified areas and aiding traffic safety.

Carbon dioxide constitutes approximately 0.04% of the air in the Earth's atmosphere. In an average year, volcanoes release between about 180 and 440 million tonnes of carbon dioxide. When this colorless, odorless gas is emitted from volcanoes, it typically becomes diluted to low concentrations very quickly and is not life threatening. However, because cold carbon dioxide gas is heavier than air it can flow into in low-lying areas where it can reach much higher concentrations in certain, very stable atmospheric conditions. This can pose serious risks to people and animals. Breathing air with more than 3% CO2 can quickly lead to headaches, dizziness, increased heart rate and difficulty breathing. At mixing ratios exceeding about 15%, carbon dioxide quickly causes unconsciousness and death.

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Hydrogen sulfide is a colorless, flammable gas with a strong, offensive odor. It is sometimes referred to as sewer gas. Interestingly, the human nose is more sensitive to H2S than any gas monitoring instrument we have today: air mixtures with as little as 0.000001% H2S are associated with a rotten egg smell. Unfortunately, however, our sense of smell is not a reliable alarm - at mixing ratios above about 0.01%, H2S becomes odorless and very toxic, causing irritation of the upper respiratory tract and, during long exposure, pulmonary edema. Exposure to 500 ppm can cause a human to fall unconscious in 5 minutes and die in an hour or less.

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In volcanic or other areas where CO2emissions occur, it is important to avoid small depressions and low areas that might be CO2 traps. The boundary between healthy air and lethal gas can be extremely sharp; even a single step upslope may be adequate to escape death. In 2006, three ski patrol members were killed at Mammoth Mountain ski resort after falling into a snow depression surrounding a volcanic fumarole and filled with cool CO2 gas. High concentrations of CO2 gas in soils can also damage or destroy vegetation, as is visible in several areas on Mammoth Mountain.

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Reflector collars are white strips made from premium white reflective plastic. The collars slip over the cone snugly, and tape or adhesive can be used to attach the collars to the cones permanently.

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With the additional of reflective collars, cones will meet the requirements in the Federal Highway Administration’s Manual on Uniform Traffic Control Devices (MUTCD), which was amended back in 1989 to mandate increased night-time visibility via the placement of additional reflective white bands on cones. To comply with the federal regulation, there should be two collars per cone – a 6 inch white collar placed 3 ½ inches from the top of the cone, and a 4 inch white collar place two inches below the upper collar.

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Traffic coneemoji

By law, traffic cones must be visible at all times, including night-time and difficult weather conditions.  Thus they are most frequently orange, with the color produced with brilliant fluorescent pigmentation to ensure maximum visibility.

Reflective collars are normally required when cones are to be used at night. It is recommended that two collars be place on a 28” cone and that one collar be placed on cones 18” or shorter.

Traffic cones send a visible, universally-understood message to motorists and pedestrians. The design and manufacture of traffic cones has evolved over the years to maximize their visibility and durability. As an important tool in highway traffic control, cones must meet governmental requirements for visibility, which has led to the increasing importance and use of reflector collars. Many entities also add messages or directions to their cones via signs attached to the top.

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Cones must also be lightweight enough so that they can easily be moved from place to place, balancing the need for strength and stability with the goal of having them able to be easily moved by hand.

Because of the manner in which they are used and the fact that they are often used outdoors in varying weather conditions, traffic cones must be manufactured to be strong enough to withstand physical contact (with vehicles and people) and numerous natural and man-made elements. Thus, high-quality traffic cones are made of a plastic substance, often polyvinyl chloride.

The production process known as the “flow process” results in premium quality cones. The process starts with a hot mold. White PVC is then added to the cones, which are then topped with fluorescent coating.  The cones are then ready to dry.

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There are two general styles: Wide Body and Narrow Body. The wide body is bigger and more stable, but the narrow body is favored by many utilities, especially for carrying within trucks.

Magma contains dissolved gases, which provide the driving force that causes most volcanic eruptions. As magma rises towards the surface and pressure decreases, gases are released from the liquid portion of the magma (melt) and continue to travel upward and are eventually released into the atmosphere. Large eruptions can release enormous amounts of gas in a short time. The 1991 eruption of Mt. Pinatubo is thought to have injected more than 250 megatons of gas into the upper atmosphere on a single day. However, even if magma never reaches the surface, gases can often escape continuously into the atmosphere from the soil, volcanic vents, fumaroles, and hydrothermal systems.

Most traffic cones feature a square base with sides to prevent air from entering the base. This helps the cone remain stable in windy conditions. Approximately 75% of the weight of a cone is at or near its base to prevent tipping.

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When magma ascends close to the surface, volcanoes can emit the halogens fluorine, chlorine and bromine in the form of hydrogen halides (HF, HCl and HBr). These species have high solubility; therefore they rapidly dissolve in water droplets within volcanic plumes or the atmosphere where they can potentially cause acid rain. In an ash-producing eruption, ash particles are also often coated with hydrogen halides. Once deposited, these coated ash particles can poison drinking water supplies, agricultural crops, and grazing land.

In addition to their direct hazard, volcanic CO2 emissions also have the capacity to affect the global climate, but scientific studies indicate that the average global volcanic output is insignificant when compared to emissions from human activity.

Cones often feature snap-on signs providing directions for pedestrians and vehicles. These signs slip into edges at the top of the cone, and are easily removable. The most common traffic cone sign is a directional arrow.

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By far the most abundant volcanic gas is water vapor, which is harmless. However, significant amounts of carbon dioxide, sulfur dioxide, hydrogen sulfide and hydrogen halides can also be emitted from volcanoes. Depending on their concentrations, these gases are all potentially hazardous to people, animals, agriculture, and property.

Sulfur dioxide is a colorless gas with a pungent odor that irritates skin and the tissues and mucous membranes of the eyes, nose, and throat. SO2 emissions can cause acid rain and air pollution downwind of a volcano—at Kīlauea volcano in Hawaii, high concentrations of sulfur dioxide produce volcanic smog (VOG) causing persistent health problems for downwind populations. During very large eruptions, SO2 can be injected to altitudes of greater than 10km into the stratosphere. Here, SO2is converted to sulfate aerosols which reflect sunlight and therefore have a cooling effect on the Earth's climate. They also have a role in ozone depletion, as many of the reactions that destroy ozone occur on the surface of such aerosols.