int leds[5] = {2,3,4,12,13};

void setup()
 {
  for (int i = 0; i <5; i++)
  {
   pinMode(leds[i], OUTPUT);
  for (int i = 0; i<5; i++)
  {
   digitalWrite(leds[i], LOW); 
  }
  }

 }

 void loop()
 {
  redcar();
  greped();
  delay(2000);
  yelcar();
  yelped();
  grecar();
  redped();
  delay(2000);
 }

 void redcar() 
 {
 digitalWrite(2, HIGH);
 digitalWrite(3, LOW);
 digitalWrite(4, LOW);
 }
void yelcar()
{
 digitalWrite(2, LOW);
 digitalWrite(3, HIGH);
 digitalWrite(4, LOW); 
}
void grecar()
{
 digitalWrite(2, LOW);
 digitalWrite(3, LOW);
 digitalWrite(4, HIGH);
}

void redped()
{
  digitalWrite(12, HIGH);
  digitalWrite(13, LOW);
}

void yelped()
{
for (int x=0; x<4; x++)
{
digitalWrite(13,LOW);
delay(500);
digitalWrite(13, HIGH);
delay(500);
}
}

void greped()
{
 digitalWrite(12, LOW);
 digitalWrite(13, HIGH);
}