Smart Traffic Light Control System (4-Way Intersection)

🎥 Demo

This project implements a smart traffic light control system for a four-way intersection.
The system supports normal traffic flow, pedestrian control, emergency overrides, and adaptive timing based on traffic density.
It was fully designed in C/Assembly for microcontrollers and simulated in Proteus.

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🎯 Objectives

• Manage traffic lights for a four-way intersection with dynamic timing adjustment.
• Enable special conditions such as:
  • Emergency vehicle priority.
  • Pedestrian crossing requests.
  • Adaptive timing based on traffic congestion (via sensors).
• Provide a realistic simulation in Proteus for testing functionality.

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⚙️ System Inputs

• Timing Control Keys
  • Increase/Decrease green light duration.
• Emergency Switch
  • Immediate override for emergency vehicles (ambulance, police, fire truck).
• Pedestrian Crossing Button
  • Activates pedestrian-friendly signal cycle.
• Traffic Sensors
  • Detect number of vehicles and adjust timing dynamically.

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💡 System Outputs

• LED Traffic Lights for each lane:
  • Green → Go
  • Yellow → Ready
  • Red → Stop
• Pedestrian LED Indicators
  • Walk / Don’t Walk signals.
• Adaptive Timing
  • Dynamic adjustment of green light duration (±2 seconds per press or based on sensors).

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🔄 System Operation

1. Normal Cycle
   • Traffic lights cycle sequentially through 4 phases:
     • North–South Green, East–West Red
     • North–South Yellow, East–West Red
     • East–West Green, North–South Red
     • East–West Yellow, North–South Red
   • Default timings: Green = 12s, Yellow = 3s, Red = 12s.
2. Emergency Mode
   • Activated by emergency switch.
   • All lights reset to give priority to emergency direction.
   • Holds for 10 seconds before resuming normal cycle.
3. Pedestrian Mode
   • Triggered by crossing button.
   • Pauses vehicle lights and enables pedestrian signals.
4. Adaptive Mode
   • Sensors measure vehicle density.
   • Congested lanes receive extended green time.
   • Light timing auto-adjusts in real time.

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🖥️ Simulation

• Designed and tested in Proteus.
• Components used:
  • Microcontroller (PIC/AVR/8051 depending on implementation).
  • LEDs for traffic lights.
  • Push buttons for pedestrian/emergency inputs.
  • Virtual traffic sensors.
• All modes (normal, emergency, pedestrian, adaptive) were verified.