void setup() {
  pinMode(13, OUTPUT);
  pinMode(14, OUTPUT);
  pinMode(15, OUTPUT);
  pinMode(16, OUTPUT);
  pinMode(17, OUTPUT);
  pinMode(18, OUTPUT);

}

void loop() {
  // road one loop
  digitalWrite(16, HIGH); //Horizontol red light

  digitalWrite(15, HIGH);
  delay(5000);
  digitalWrite(15, LOW);

  digitalWrite(14, HIGH);
  delay(5000);
  digitalWrite(14, LOW);

  // digitalWrite(13, HIGH);
  // delay(5000);
  // digitalWrite(13, LOW);


  // road two loop
  digitalWrite(13, HIGH); //vertical red light

  digitalWrite(16, HIGH);
  delay(5000);
  digitalWrite(16, LOW);

  digitalWrite(17, HIGH);
  delay(5000);
  digitalWrite(17, LOW);

  digitalWrite(18, HIGH);
  delay(5000);
  digitalWrite(18, LOW);

  // reverse start
  digitalWrite(17, HIGH);
  delay(5000);
  digitalWrite(17, LOW);

  // digitalWrite(16, HIGH);
  // delay(5000);
  // digitalWrite(16, LOW);

  digitalWrite(16, HIGH); //Horizontol red light

  digitalWrite(13, HIGH);
  delay(5000);
  digitalWrite(13, LOW);

  digitalWrite(14, HIGH);
  delay(5000);
  digitalWrite(14, LOW);

  // digitalWrite(15, HIGH);
  // delay(5000);
  // digitalWrite(15, LOW);
}