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1 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 traffic lights.
Go
Traffic lights are devices that control the traffic through the
use of colours. These lights are placed at road intersections,
pedestrian crossing for smooth traffic flow.
How do traffic lights work?
Traffic 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 often contain sensors that detect the number of vehicles or pedestrians at a
specific point and adjust signal timing accordingly.
Introduction to Coding 7

