This method of street lighting is only suitable for straight sections of the road. In this case, the observer requires to see the objects about 30 meters away. In case of specular reflection principle, the reflectors are curved upward so that the light is thrown on the road at a very large angle of incidence. To avoid the glare, the reflectors are made to have a cut-off between 30° to 45° so that the lamp filament is not visible except below the lamp.Īs the surface of the road has diffusing nature causes the reflection of a certain portion of the incident light in the direction of the observer and hence the road surface appears bright to the observer. The design of the reflectors is such that they direct the light downwards and spread it as uniformly as possible over the surface of the road. In the diffusion principle of design of street lighting, the lamps fitted with suitable reflectors are used. Street lighting improves the traffic speed and the traffic flow conditions.įor designing the street lighting scheme, the following two general principles are usually employed − Street lights also make the street more attractive. Street lighting is provided along the road sides to make traffic and obstructions on the road clearly visible in order promote safety and convenience.
Street lighting is required to increase or enhance the community value of the street. The primary objectives of street lighting are −
Street lighting is required along the road to have safer, comfortable, convenient and efficient movement of vehicles at night. A source of light that is mounted on a lamp column or pole either on the side of the road or within the median to provide illumination is known as street lighting.
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