led Lightheads

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

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