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Traffic Lights – How they Work, Programs, Sensors

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Traffic lights are signaling devices installed at pedestrian crossings, road intersections or at any other points where the flow of traffic has to be regulated. Generally, a light stick has three parts – red on top, amber and green at the bottom. The red is for stop, the amber for caution and the green for go. A traffic light stick often has two lights mounted vertically and are seen at exit to fire stations or railway crossings when traffic has to be temporarily stopped without any fixed time duration. These flash white or amber when cross traffic is not expected and red when traffic has to be stopped for example to let a fire truck drive out of the station. There is another type of traffic light stick which is not installed at traffic intersections but handheld by police or other emergency agencies to control traffic. These are safety batons. The top half is encased in a transparent polycarbonate casing with an LED light in them. Such sticks are especially useful in a scene of a
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Various Aspects of Police Siren and their Uses

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There are a number of reasons why police siren is so critical for law enforcement. A police siren signals an approaching police car, indicating that help is at hand. It is also used to clear the road ahead when rushing to a call. Police sirens are also useful to indicate to a driver to pull over in case of any infringement of law. Emergency vehicles have different siren sounds so that the presence of a fire-truck, an ambulance or a police car can be distinguished by the people at large. If all emergency vehicles had the same siren, they would find it difficult to distinguish between each other’s sirens. This can lead to crashes which are sometimes referred to as a wash-out effect. There are two common sounds that emanate from a police siren box in the USA. One is the wail which is the traditional sound that also denotes the speed of the car. The other is the yelp that has an increasing and decreasing pitch, thereby catching the attention of the people at the site of an incident or
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Emergency lighting for hazardous workplaces

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Manufacturing plants and industrial units with perilous areas are often prone to safety issues and thereby, are in a considerable need for proper emergency LED lighting. The wellbeing of representatives who work in dangerous areas is of central significance, and in itself, security becomes a real motivation to introduce appropriately appraised LED lighting in those areas. Globally acknowledged industrial guidelines form the basis for declaring a work region as a dangerous area. The conditions around a production sector or assembling office, for instance, may incorporate combinations of combustible vapors, or harmful fibers. This is especially valid for work regions in restricted spaces, where toxic gases may get accumulated and lead to a much more prominent peril. That is precisely where explosion proof LED lighting comes into the picture. In conventional terms, EPL is an LED lighting that withstands disastrous ignition via a mix of its materials, its physical structure, and its s
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What you should know about Police Siren and their Uses

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The main factor distinguishing police cars from others on the road is the audio and visual signals installed in them. Of the two, sirens are more effective as they can be heard much before the arrival of the vehicle at the scene of an incident. These sirens are either mechanical or electronic devices. The type that can be installed on police cars are strictly mandated by law in the USA and any deviation leads to strict fines and penalties.  Police sirens have evolved greatly over time and before you buy police siren for car , you should know more about its intricacies. The early versions of police sirens were mechanical devices that required a lot of maintenance and were not very reliable. Now, electronic sirens are used that have to be simply plugged into the car’s power unit. Various pitches and frequencies can be generated from this one device through in-built oscillators, modulators, and amplifiers. The options before a police officer are sounds ranging from a yelp to wail, hi-
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How Does Traffic Signal Preemption work

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Traffic signal preemption is a system that prioritizes traffic flow as per requirements through manipulation of normal traffic lights. The most common reason is controlling traffic signals in the path of an emergency vehicle so that normal traffic is regulated and it has right of way. Traffic signals are also preempted to help public transportation quickly through intersections or for regulating traffic at railroad crossings to avoid collisions.   Traffic preemption systems can be categorized as follows. • Acoustic sensors – Acoustic sensors are linked to the preemption system where a specific pattern of wails or tweets from the siren of an emergency vehicle overrides the traffic signal. The advantage here is that such a system can be easily integrated into the existing traffic signals. • Radio signals – A radio-based signal in the short-range 900MHz band uses a directional signal from an emitter to preempt traffic signals. This radio signal is not blocked by lighting,
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The Role and Functions of Police Siren

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The role of police sirens is critical in alerting pedestrians and people on the road of the presence of a police vehicle. Indeed, it is not only to warn drivers on the road only but also people on the sidewalks too. For instance, a police vehicle might be in pursuit of a rogue car at high speed with the sound of the siren acting as an indication for people on the sidewalks not to get down on the main road. The sound from a police siren speaker is often changed to get the maximum attention. Police officers generally use the “wail” sound when they are on the highway. Once they face heavy traffic at intersections or crowds, they switch to the “piercer” tone, so called because the sound pierces through the senses of people. The latest in police car sirens is the “howler” function which operates at low frequency and alerts drivers miles in front to move out of the way. In a nutshell, then, police sirens are used in a wide range of circumstances. Their primary function is to inform peop
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Why Traffic Management Signals are Important

Safety and smooth movement of traffic are two critical components of optimized traffic management. To ensure these aspects, there are traffic management centers that monitor and track road conditions on a continual basis. The major task of these centers is to collect, process and forward all information received and manage traffic on various roads. A primary device that ensures optimum traffic control is traffic signals or traffic management signals.   It is through traffic signals and especially-made strobe and LED lights that traffic is controlled and safety on the roads is ensured. Advanced software programs control these lights and manufacturers deploy special processes to make sure that they function well at all times. Visit tomar.com to know more on strobe and LED lights in relation to traffic signals. The company has been in business for more than 50 years and is considered a leader in this field.   Apart from traffic signals per se which control the smooth flow of traffic, o
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