Semáforo con luces led (Arduino) (C++)

int rojo = 8;
int verde = 10;
int amarillo = 9;

void setup () {
  pinMode (8, OUTPUT);
  pinMode (9, OUTPUT);
  pinMode (10, OUTPUT);

  }

void loop (){
  digitalWrite (rojo, HIGH);
  delay(5000);
  digitalWrite (rojo, LOW);
  digitalWrite (amarillo, HIGH);
  delay(700);
  digitalWrite (amarillo, LOW);
  digitalWrite (verde, HIGH);
  delay(5000);
  digitalWrite (verde, LOW);
  digitalWrite (amarillo, HIGH);
  delay(700);
  digitalWrite (amarillo, LOW);

  }