#include<Servo.h>
Servo myservo;
const int redPin = 2;
const int yellowPin = 3;
const int greenPin = 4;

void setup() {
  pinMode(redPin, OUTPUT);
    pinMode(yellowPin, OUTPUT);
    pinMode(greenPin, OUTPUT);

}

void loop() {
  // Red light
    digitalWrite(redPin, HIGH);
    digitalWrite(yellowPin, LOW);
    digitalWrite(greenPin, LOW);
    delay(3000); // Red light duration

    // Yellow light
    digitalWrite(redPin, LOW);
    digitalWrite(yellowPin, HIGH);
    delay(1000); // Yellow light duration

    // Green light
    digitalWrite(yellowPin, LOW);
    digitalWrite(greenPin, HIGH);
    delay(3000); // Green light duration

    // Yellow (transition from green to red)
    digitalWrite(greenPin, LOW);
    digitalWrite(yellowPin, HIGH);
    delay(1000); // Yellow light duration

}