// Moch Rijki Supriyatna:(MRS) ("IKY")

// Define pins for traffic lights
int redPins[4] = {13, 10, 5, 2};
int yellowPins [4] = {12, 9, 6, 3};
int greenPins[4] = {11, 8, 7, 4};

// Time for each light (in milliseconds)
int redTime = 1000;
int yellowTime = 500;
int greenTime = 2000;

void setup() {
// Set pin as OUTPUT
for (int i = 0; i < 4; i++) {
pinMode(redPins[i], OUTPUT);
pinMode(yellowPins[i], OUTPUT);
pinMode(greenPins[i], OUTPUT);
}
}

void loop() {
  for (int lane = 0; lane < 4; lane++) {
  setTrafficLight(lane);
  }
  }

  // Function to set traffic lights for a specific lane
  void setTrafficLight(int lane) {
  // Turn off all the lights first 
  for (int i = 0; i < 4; i++) {
  digitalWrite(greenPins[i], LOW);
  digitalWrite(yellowPins[i], LOW);
  digitalWrite(redPins[i], HIGH);
  }

  // Turn on the green light for the active line
  digitalWrite(greenPins [lane], HIGH);
  digitalWrite(redPins [lane], LOW);

  // Turns on the green light for the specified time.
  delay(greenTime)

  // Turn off the green light
  ;digitalWrite (greenPins [lane], LOW);

  // Turns on the yellow light for the active lane
  digitalWrite(yellowPins [lane], HIGH);
  delay(yellowTime)

  // Turn off the yellow light
  ;digitalWrite(yellowPins [lane], LOW);
  }