const int redLED = 8, yellowLED = 9, greenLED = 10;
const int redDuration = 5000, greenDuration = 5000, yellowDuration = 2000;
void setup() {
    pinMode(redLED, OUTPUT); pinMode(yellowLED, OUTPUT); pinMode(greenLED, OUTPUT);
}
void loop() {
    digitalWrite(greenLED, HIGH); delay(greenDuration);
    for (int i = 0; i < 3; i++) { digitalWrite(greenLED, LOW); delay(300); digitalWrite(greenLED, HIGH); delay(300); }
    digitalWrite(greenLED, LOW);
    digitalWrite(yellowLED, HIGH); delay(yellowDuration); digitalWrite(yellowLED, LOW);
    digitalWrite(redLED, HIGH); delay(redDuration); digitalWrite(redLED, LOW);
}