On 9 December 1868, the first non-electric gas-lit traffic lights were installed outside the Houses of Parliament in London to control the traffic in Bridge Street, Great George Street, and Parliament Street. They were proposed by the railway engineer J. P. Knight of Nottingham who had adapted this idea from his design of railway signalling systems and constructed by the railway signal engineers of Saxby & Farmer. The main reason for the traffic light was that there was an overflow of horse-drawn traffic over Westminster Bridge which forced thousands of pedestrians to walk next to the Houses of Parliament. The design combined three semaphore arms with red and green gas lamps for night-time use, on a pillar, operated by a police constable. The gas lantern was manually turned by a traffic police officer with a lever at its base so that the appropriate light faced traffic. The signal was 22 feet (6. 7 m) high. The light was called the semaphore and had arms that would extend horizontally that commanded drivers to “Stop” and then the arms would lower to a 45 degrees angle to tell drivers to proceed with “Caution”. At night a red light would command “Stop” and a green light would mean use “Caution”.
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There is no doubt that visual learning plays a key role in terms of children's learning and development. In fact , visual teachings are generally regarded as one of the most important factors that add a lot to a baby's early growth and development. For the records, children are easily affected by what they see, feel, feel and participate more than just the actual hear. Visuals help them sustain and remember lessons taught. It also takes care of verbal miscommunication and in addition creates and retains their interest in a particular lesson. It is usually said that humans, especially youngsters tend to remember 10% of what they hear, 50% of what they see, and 85% of what they see and do. This underlines the importance of visual aids in learning and development of kids.
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