int ledRed1 = 13;
int ledOrange1 = 12;
int ledGreen1 = 11; 

int ledRed2 = 9;
int ledOrange2 = 8;
int ledGreen2 = 7; 

int iDelay = 2000;


void setup() {
  // put your setup code here, to run once:
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(ledRed1, OUTPUT);
  pinMode(ledOrange1, OUTPUT);
  pinMode(ledGreen1, OUTPUT);
  pinMode(ledRed2, OUTPUT);
  pinMode(ledOrange2, OUTPUT);
  pinMode(ledGreen2, OUTPUT);
  //beide kruispunten starten met rood (veiligheid)
  digitalWrite(ledRed1, HIGH);
  digitalWrite(ledRed2, HIGH);
}

void loop() {

  //tweede kruispunt op rood
  reset2();
  digitalWrite(ledRed2, HIGH);

  //veiligheid: kruispunt ontruimen
  delay(iDelay);  

  //eerste kruispunt op groen
  reset1();
  digitalWrite(ledGreen1, HIGH);

  delay(iDelay);
  
  // eerste kruispunt op oranje
  reset1();
  digitalWrite(ledOrange1, HIGH);
    
  delay(iDelay);
  
  //eerste kruispunt op rood
  reset1();
  digitalWrite(ledRed1, HIGH);

  //veiligheid: kruispunt ontruimen
  delay(iDelay);

  //tweede kruispunt op groen
  reset2();
  digitalWrite(ledGreen2,HIGH);
  
  delay(iDelay);
  
  //tweede kruispunt op oranje
  reset2();
  digitalWrite(ledOrange2, HIGH);
  
  delay(iDelay);
}

void reset1() {
  digitalWrite(ledGreen1, LOW);
  digitalWrite(ledOrange1, LOW);
  digitalWrite(ledRed1, LOW);
}

void reset2() {
  digitalWrite(ledGreen2, LOW);
  digitalWrite(ledOrange2, LOW);
  digitalWrite(ledRed2, LOW);
}