const int buttonPin = 2;    
const int redLedPin = 8;    
const int yellowLedPin = 9; 
const int greenLedPin = 10; 

int buttonState = 0;        
int previousButtonState = 0;
bool trafficLightOn = false;

void setup() {
  pinMode(buttonPin, INPUT);   
  pinMode(redLedPin, OUTPUT);   
  pinMode(yellowLedPin, OUTPUT);
  pinMode(greenLedPin, OUTPUT); 

  
  digitalWrite(redLedPin, LOW);
  digitalWrite(yellowLedPin, LOW);
  digitalWrite(greenLedPin, LOW);
}

void loop() {
  buttonState = digitalRead(buttonPin);  

  
  if (buttonState == HIGH && previousButtonState == LOW) {
    trafficLightOn = !trafficLightOn;  
    delay(50);                         
  }
  previousButtonState = buttonState;

  if (trafficLightOn) {

    digitalWrite(redLedPin, HIGH);
    delay(30000);
    digitalWrite(redLedPin, LOW);


    digitalWrite(yellowLedPin, HIGH);
    delay(1000);
    digitalWrite(yellowLedPin, LOW);


    digitalWrite(greenLedPin, HIGH);
    delay(30000);
    digitalWrite(greenLedPin, LOW);
  }
}