However, the move by the Johannesburg Road Agency (JRA) is not only an environmentally friendly move, but a shrewd one. The new lights will work even during a normally traffic crippling power cut.
JRA Spokesperson, Conel Mackay said they were closely monitoring the performance of the solar traffic lights under South African weather conditions and their network performance by installing CCTV cameras.
The five sets of high-tech traffic lights have been installed at five critical intersections within the city, and initial installation costs stand at R1,65-million ($164,644). The intersections were chosen to accommodate the 2010 demands and help the police cope with the challenges, said Mr Mackay.
The purpose of installing solar-powered traffic signaling is not only to provide a source of clean, renewable energy, but to save on electricity costs. As well as solar technology, the traffic signal globes are fitted with light-emitting diodes (LEDS) which consume less electricity than conventional light bulbs. In addition, they also last for a minimum of five years as opposed to the three-month lifespan of the conventional light bulbs, making them ideal for such public projects.
The traffic lights are powered by a solar panel, tilted at a 30-degree angle to ensure maximum efficiency in capturing the sun’s rays. Solar lights are designed to provide illumination automatically from dusk to dawn. Each system can charge itself, store and produce electricity even on overcast days. To prevent vandalism, the solar panels are located at the top of a 6m pole, while the batteries are placed in support case made of cement.
The direct benefits will be realized on the reduction of electric consumption as well as a drop in maintenance, since the LEDs consume less energy and last longer than normal bulbs, said Mr Mackay.
