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In your day to day life, you must have come across the term 'coding'. Stop
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.
What is a Traffic Light System? Wait
While going to school, you must have seen a traffic light.
Traffic lights are devices that control traffic through the use of colours.
Go
These lights are placed at road intersections and pedestrian crossings
for smooth traffic flow.
How do Traffic Lights Work?
In a 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.
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.
At regular intervals of time, the code automatically changes the traffic signals to show colors (red,
yellow, green).
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.
Where Else do We See Applications of Coding?
These days, a lot of our daily lives rely on coding. We are somehow connected through coding. For
example, smartphones, computers, videogames, car dashboards, etc., are all using some sort of
code to perform their tasks.
Bar code scanner Booking tickets Printer
Using MakeCode Arcade 79

