unsigned long previousTraffic =0;
unsigned long previousPedestrain =0;
unsigned long previousStatus =0;

int trafficState =0;

const int redLED =2;
const int yellowLED =3;
const int greenLED =4;
const int pedestrainLED =5;

void setup(){
  
  pinMode(redLED, OUTPUT);
  pinMode(yellowLED, OUTPUT);
  pinMode(greenLED, OUTPUT);
  pinMode(pedestrainLED, OUTPUT);

  Serial.begin(9600);
}
void loop(){

  taskTrafficLights();
  taskPedestrains();
  taskStatus();
}

void taskTrafficLights(){
  
  if (millis()-previousTraffic >=3000){
    previousTraffic =millis();
    trafficState++;
     
     if (trafficState >2){
      trafficState = 0;
     }
     digitalWrite(redLED , LOW);
     digitalWrite(yellowLED, LOW);
     digitalWrite(greenLED, LOW);

     if (trafficState == 0){
      digitalWrite(greenLED, HIGH);
     }
     else if (trafficState ==1){
      digitalWrite(yellowLED, HIGH);
    
     }
     else if (trafficState ==2){
      digitalWrite(redLED, HIGH);

     }
  }
}

void taskPedestrain(){
   
   if (millis() -previousPedestrain >=500){

    previousPedestrian =millis();

    digitalWrite(pedestrianLED,
                !digitalRead(pedestrianLED));
   }

   void taskStatus ()
    if (millis() - previoustatus >=2000){

      previousStatus = millis();
      Serial.println("Traffic System Running...");
    
   }
}