int REDPIN=13;
int YELLOWPIN=12;
int GREENPIN=11;

void setup(){
  pinMode(REDPIN, OUTPUT);
  pinMode(YELLOWPIN, OUTPUT);
  pinMode(GREENPIN, OUTPUT);

}

void loop(){
  digitalWrite(REDPIN, HIGH);\
  digitalWrite(YELLOWPIN, LOW);
  digitalWrite(GREENPIN, LOW);
  delay(10000);

  digitalWrite(REDPIN, LOW);
  digitalWrite(YELLOWPIN, HIGH);
  digitalWrite(GREENPIN, LOW);
  delay(10000);

  digitalWrite(REDPIN, LOW);
  digitalWrite(YELLOWPIN, LOW);
  digitalWrite(GREENPIN, HIGH);
  delay(10000);


}