void setup() { 
pinMode(13, OUTPUT); //RED LED
pinMode(12, OUTPUT); //GREEN LED
pinMode(11, OUTPUT); //ORANGE LED
Serial.begin(9600);
}

void loop() {

for(int red=10; red>=1; red--){
digitalWrite(13, HIGH);
digitalWrite(12, LOW);
digitalWrite(11, LOW);
Serial.print(" STOP ");
Serial.println(red);
delay(1000);
}
for(int green=12; green>=1; green--){
digitalWrite(13, LOW);
digitalWrite(12, HIGH);
digitalWrite(11, LOW);
Serial.print(" GO ");
Serial.println(green);
delay(1000);
}
for(int orange=3; orange>=1; orange--){
digitalWrite(13, LOW);
digitalWrite(12, LOW);
digitalWrite(11, HIGH);
Serial.print(" CAUTION ");
Serial.println(orange);
delay(1000);
}

}