void setup() {
    pinMode(6, OUTPUT); //green TL
    pinMode(7, OUTPUT); //yellow TL
    pinMode(8, OUTPUT); //red TL
    pinMode(9, OUTPUT); //red PL
    pinMode(10, OUTPUT); //green PL
}

void loop() {
    digitalWrite(8, HIGH);
    digitalWrite(10, HIGH);
    delay(6000);
    digitalWrite(8, LOW);
    digitalWrite(10, LOW);
    digitalWrite(6, HIGH);
    digitalWrite(9, HIGH);
    delay(3000);
    digitalWrite(6, LOW);
    digitalWrite(9, LOW);
    digitalWrite(7, HIGH);
    digitalWrite(9, HIGH);
    delay(5000);
    digitalWrite(7, LOW);
    digitalWrite(9, LOW);
}