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3                       Introduction to Coding

















                          Learning Outcomes
                       Introduction                                             Traffic Light

                       Where else do we see Applications of Coding?             What Exactly is Coding?
                       What is a Programming Language?



                  INTRODUCTION

                  In your day to day life, you must have come across the term                                  Stop
                  'coding'. Have you wondered what it means. In this chapter, you
                  are going to learn what is coding and its usage in day to day life.

                                                                                                              Wait
                  TRAFFIC LIGHT
                  While going to school, you must have seen a traffic light.

                  Traffic lights  are devices that control the traffic  through  the                           Go
                  use of colours. These lights  are placed at road intersections,
                  pedestrian crossing for smooth traffic flow.


                  How do traffic lights work?
                  In  traffic light, the lights cycle through  green (allows traffic to proceed in the direction

                  denoted), yellow (warns that the signal is about to change to red), and red (stops traffic
                  from proceeding) at regular intervals of time. Traffic lights help to prevent accidents and
                  congestion on the roads.

                                           Coding fact


                    John Peake Knight invented the first traffic light, after that William Potts invented the modern
                    three-lens traffic light and Garrett Morgan invented the first automatic traffic light.



                  How do the traffic lights change automatically?

                  Traffic lights contain  sensors which  are programmed to calculate how  many cars or
                  pedestrians are present at a specific point.



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