int Red = 2;
int Yellow = 4;
int Green = 7;
int ledDelay = 10000;

void setup() {
  pinMode(Red, OUTPUT);
  pinMode(Yellow, OUTPUT);
  pinMode(Green, OUTPUT);
}

void loop() {

 digitalWrite(Green, HIGH);
 delay(10000);
  digitalWrite(Green, LOW);
  digitalWrite(Yellow, HIGH);
  delay(5000);
  digitalWrite(Yellow, LOW);
  digitalWrite(Red, HIGH);
  delay(10000);
  digitalWrite(Red, LOW);
}