LLD-5.5:Traffic Signal System

📰 Dev.to · NOOB

Learn to implement the Observer pattern in a Traffic Signal System using LLD-5.5

intermediate Published 14 Feb 2026
Action Steps
  1. Design the Traffic Signal System using the Observer pattern
  2. Implement the Subject interface to represent the traffic signal
  3. Create ConcreteSubject classes for each traffic signal state (e.g., red, yellow, green)
  4. Implement the Observer interface to represent the traffic signal observers
  5. Create ConcreteObserver classes for each type of observer (e.g., pedestrian, vehicle)
Who Needs to Know This

Software engineers and developers can benefit from this implementation to design and develop scalable traffic signal systems. This can be applied in IoT-based smart city projects.

Key Insight

💡 The Observer pattern allows for loose coupling between subjects and observers, making it easier to add or remove observers without affecting the subject

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💡 Implement the Observer pattern in a Traffic Signal System using LLD-5.5 for scalable and efficient design

Key Takeaways

Learn to implement the Observer pattern in a Traffic Signal System using LLD-5.5

Full Article

Traffic Signal System - Observer Pattern Implementation This is an implementation of the...
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