// Define the pin connections for the LEDs
const int redLedPin = 2;        // Red LED connected to digital pin 2
const int yellowLedPin = 3;     // Yellow LED connected to digital pin 3
const int greenLedPin = 4;      // Green LED connected to digital pin 4

void setup() {
  // Set the pin modes for the LEDs
  pinMode(redLedPin, OUTPUT);
  pinMode(yellowLedPin, OUTPUT);
  pinMode(greenLedPin, OUTPUT);
}

void loop() {
  // Turn on the Green LED for 5 seconds (vehicle go)
  digitalWrite(greenLedPin, HIGH);   // Green LED ON
  digitalWrite(yellowLedPin, LOW);   // Yellow LED OFF
  digitalWrite(redLedPin, LOW);      // Red LED OFF
  delay(5000);  // Wait for 5 seconds

  // Turn on the Yellow LED for 2 seconds (warning)
  digitalWrite(greenLedPin, LOW);    // Green LED OFF
  digitalWrite(yellowLedPin, HIGH);  // Yellow LED ON
  digitalWrite(redLedPin, LOW);      // Red LED OFF
  delay(2000);  // Wait for 2 seconds

  // Turn on the Red LED for 5 seconds (vehicle stop)
  digitalWrite(greenLedPin, LOW);    // Green LED OFF
  digitalWrite(yellowLedPin, LOW);   // Yellow LED OFF
  digitalWrite(redLedPin, HIGH);     // Red LED ON
  delay(5000);  // Wait for 5 seconds
}