int Verde = 10;
int Amarillo = 9;
int Rojo = 3;
int pop (10000);
int pop2 (3000);
int pop3 (8000);

void setup() {pinMode(Verde, OUTPUT);
pinMode(Amarillo, OUTPUT);
pinMode(Rojo, OUTPUT);
}

void loop() {digitalWrite(Verde, HIGH);digitalWrite(Amarillo, LOW); digitalWrite(Rojo, LOW);
delay(pop);
digitalWrite(Amarillo, HIGH); digitalWrite(Verde, LOW); digitalWrite(Rojo, LOW);
delay(pop2);
digitalWrite(Rojo, HIGH); digitalWrite(Amarillo, LOW); digitalWrite(Verde, LOW);
delay(pop3);
}