Many accidents happen because vehicles move at high speeds in sensitive zones (school zones, hospitals, sharp turns). This project aims to automatically reduce vehicle speed when it enters a restricted zone, preventing accidents.

🔹 Working Principle

1. Transmitter at Roadside

   • In school zones, accident-prone areas, or traffic checkpoints → an RF transmitter (433 MHz / IR / RFID / LoRa beacon) is installed.

2. Receiver in Vehicle

   • Every vehicle has a small RF/IR receiver connected to an Arduino / microcontroller + motor driver (L298N/ESC).

3. Normal Condition

   • Vehicle runs at full speed (as per code).

4. When in Restricted Zone

   • Receiver picks up the signal → Arduino reduces motor PWM (speed) to a safe level (e.g., 30–40%).

5. After Leaving Zone

   • Signal lost → speed automatically returns to normal.

🔹 Components Required

• Arduino Uno / Nano – controller inside vehicle

• RF Transmitter (433 MHz / LoRa / IR LED) – roadside unit

• RF Receiver – mounted on vehicle

• DC Motor + Motor Driver (L298N / L293D) – simulating vehicle engine

• Power Supply (Battery) – 9V / Li-ion pack

• LEDs / LCD – to display speed status (optional)

• Small Car Chassis with Motors – for prototype demo

🔹 Cost Estimate (Prototype)

💰 Total: ~ ₹1,600 – ₹2,200

🔹 Real-Life Applications

✅ Prevents speeding in school zones, hospitals, residential areas
✅ Reduces accidents in hilly or accident-prone roads
✅ Can be integrated into smart city traffic systems
✅ Future extension → IoT/GPS for automatic vehicle-to-road communication

⚡ In short:

• It’s like a “speed governor” but automatic & zone-specific.

• Small prototype = RF transmitter + Arduino car.

• Real-world = GPS + vehicle ECU integration.