Traffic light system

int delayMins = 2  // Delay in minuites between states

/*
  INDEXES
    0 -> North
    1 -> East
    2 -> South
    3 -> West
*/
int dataPins[] = [0, 3, 6, 9];
int latchPins[] = [1, 4, 7, 10];
int clockPins[] = [2, 5, 8, 11];

byte leds[] = [0, 0, 0, 0];

void setup()
{
  for (int i = 0; i < 4; i++)
  {
    pinMode(latchPins[i], OUTPUT);
  }

  for (int i = 0; i < 4; i++)
  {
    pinMode(dataPins[i], OUTPUT);
  }

  for (int i = 0; i < 4; i++)
  {
    pinMode(clockPins[i], OUTPUT);
  }

}

void updateShiftRegister(int dir)
{
  digitalWrite(latchPins[dir], LOW);
  shiftOut(dataPins[dir], clockPins[dir], LSBFIRST, leds[dir]);
  digitalWrite(latchPins[dir], HIGH);
}

void loop()
{
  // State 1
  leds[0] = B00110010;  // North
  updateShiftRegister(0);
  leds[1] = B00001000;  // East
  updateShiftRegister(1);
  leds[2] = B00001000;  // South
  updateShiftRegister(2);
  leds[3] = B00001000;  // West
  updateShiftRegister(3);
  delay(delayMins * 60 * 1000); // Desired time delay

  // State 2
  leds[0] = B00110110;  // North
  updateShiftRegister(0);
  leds[1] = B00001000;  // East
  updateShiftRegister(1);
  leds[2] = B00001100;  // South
  updateShiftRegister(2);
  leds[3] = B00001000;  // West
  updateShiftRegister(3);
  delay(delayMins * 60 * 1000); // Desired time delay

  // State 3
  leds[0] = B00001000;  // North
  updateShiftRegister(0);
  leds[1] = B00001000;  // East
  updateShiftRegister(1);
  leds[2] = B00110010;  // South
  updateShiftRegister(2);
  leds[3] = B00001000;  // West
  updateShiftRegister(3);
  delay(delayMins * 60 * 1000); // Desired time delay

  // State 4
  leds[0] = B00001000;  // North
  updateShiftRegister(0);
  leds[1] = B00001100;  // East
  updateShiftRegister(1);
  leds[2] = B00110110;  // South
  updateShiftRegister(2);
  leds[3] = B00001000;  // West
  updateShiftRegister(3);
  delay(delayMins * 60 * 1000); // Desired time delay

  // State 5
  leds[0] = B00001000;  // North
  updateShiftRegister(0);
  leds[1] = B00110010;  // East
  updateShiftRegister(1);
  leds[2] = B00001000;  // South
  updateShiftRegister(2);
  leds[3] = B00001000;  // West
  updateShiftRegister(3);
  delay(delayMins * 60 * 1000); // Desired time delay

  // State 6
  leds[0] = B00001000;  // North
  updateShiftRegister(0);
  leds[1] = B00110110;  // East
  updateShiftRegister(1);
  leds[2] = B00001000;  // South
  updateShiftRegister(2);
  leds[3] = B00001100;  // West
  updateShiftRegister(3);
  delay(delayMins * 60 * 1000); // Desired time delay

  // State 7
  leds[0] = B00001000;  // North
  updateShiftRegister(0);
  leds[1] = B00001000;  // East
  updateShiftRegister(1);
  leds[2] = B00001000;  // South
  updateShiftRegister(2);
  leds[3] = B00110010;  // West
  updateShiftRegister(3);
  delay(delayMins * 60 * 1000); // Desired time delay

  // State 8
  leds[0] = B00001100;  // North
  updateShiftRegister(0);
  leds[1] = B00001000;  // East
  updateShiftRegister(1);
  leds[2] = B00001100;  // South
  updateShiftRegister(2);
  leds[3] = B00110110;  // West
  updateShiftRegister(3);
  delay(delayMins * 60 * 1000); // Desired time delay

  // State 9
  leds[0] = B00100010;  // North
  updateShiftRegister(0);
  leds[1] = B00001000;  // East
  updateShiftRegister(1);
  leds[2] = B00100010;  // South
  updateShiftRegister(2);
  leds[3] = B00001000;  // West
  updateShiftRegister(3);
  delay(delayMins * 60 * 1000); // Desired time delay

  // State 10
  leds[0] = B00100110;  // North
  updateShiftRegister(0);
  leds[1] = B00001100;  // East
  updateShiftRegister(1);
  leds[2] = B00100110;  // South
  updateShiftRegister(2);
  leds[3] = B00001100;  // West
  updateShiftRegister(3);
  delay(delayMins * 60 * 1000); // Desired time delay

  // State 11
  leds[0] = B00001000;  // North
  updateShiftRegister(0);
  leds[1] = B00100010;  // East
  updateShiftRegister(1);
  leds[2] = B00001000;  // South
  updateShiftRegister(2);
  leds[3] = B00100010;  // West
  updateShiftRegister(3);
  delay(delayMins * 60 * 1000); // Desired time delay

  // State 12
  leds[0] = B00001100;  // North
  updateShiftRegister(0);
  leds[1] = B00100110;  // East
  updateShiftRegister(1);
  leds[2] = B00001100;  // South
  updateShiftRegister(2);
  leds[3] = B00100110;  // West
  updateShiftRegister(3);
  delay(delayMins * 60 * 1000); // Desired time delay

  // State 13
  leds[0] = B00010010;  // North
  updateShiftRegister(0);
  leds[1] = B00001000;  // East
  updateShiftRegister(1);
  leds[2] = B00010010;  // South
  updateShiftRegister(2);
  leds[3] = B00001000;  // West
  updateShiftRegister(3);
  delay(delayMins * 60 * 1000); // Desired time delay

  // State 14
  leds[0] = B00010110;  // North
  updateShiftRegister(0);
  leds[1] = B00001100;  // East
  updateShiftRegister(1);
  leds[2] = B00010110;  // South
  updateShiftRegister(2);
  leds[3] = B00001100;  // West
  updateShiftRegister(3);
  delay(delayMins * 60 * 1000); // Desired time delay

  // State 15
  leds[0] = B00001000;  // North
  updateShiftRegister(0);
  leds[1] = B00010010;  // East
  updateShiftRegister(1);
  leds[2] = B00001000;  // South
  updateShiftRegister(2);
  leds[3] = B00010010;  // West
  updateShiftRegister(3);
  delay(delayMins * 60 * 1000); // Desired time delay

  // State 16
  leds[0] = B00001100;  // North
  updateShiftRegister(0);
  leds[1] = B00010110;  // East
  updateShiftRegister(1);
  leds[2] = B00001000;  // South
  updateShiftRegister(2);
  leds[3] = B00010110;  // West
  updateShiftRegister(3);
  delay(delayMins * 60 * 1000); // Desired time delay

  // State 17
  leds[0] = B00010011;  // North
  updateShiftRegister(0);
  leds[1] = B00001000;  // East
  updateShiftRegister(1);
  leds[2] = B00001000;  // South
  updateShiftRegister(2);
  leds[3] = B00001000;  // West
  updateShiftRegister(3);
  delay(delayMins * 60 * 1000); // Desired time delay

  // State 18
  leds[0] = B00010111;  // North
  updateShiftRegister(0);
  leds[1] = B00001000;  // East
  updateShiftRegister(1);
  leds[2] = B00001100;  // South
  updateShiftRegister(2);
  leds[3] = B00001000;  // West
  updateShiftRegister(3);
  delay(delayMins * 60 * 1000); // Desired time delay

  // State 19
  leds[0] = B00001000;  // North
  updateShiftRegister(0);
  leds[1] = B00001000;  // East
  updateShiftRegister(1);
  leds[2] = B00010011;  // South
  updateShiftRegister(2);
  leds[3] = B00001000;  // West
  updateShiftRegister(3);
  delay(delayMins * 60 * 1000); // Desired time delay

  // State 20
  leds[0] = B00001000;  // North
  updateShiftRegister(0);
  leds[1] = B00001100;  // East
  updateShiftRegister(1);
  leds[2] = B00010111;  // South
  updateShiftRegister(2);
  leds[3] = B00001000;  // West
  updateShiftRegister(3);
  delay(delayMins * 60 * 1000); // Desired time delay

  // State 21
  leds[0] = B00001000;  // North
  updateShiftRegister(0);
  leds[1] = B00010011;  // East
  updateShiftRegister(1);
  leds[2] = B00001000;  // South
  updateShiftRegister(2);
  leds[3] = B00001000;  // West
  updateShiftRegister(3);
  delay(delayMins * 60 * 1000); // Desired time delay

  // State 22
  leds[0] = B00001000;  // North
  updateShiftRegister(0);
  leds[1] = B00010111;  // East
  updateShiftRegister(1);
  leds[2] = B00001000;  // South
  updateShiftRegister(2);
  leds[3] = B00001100;  // West
  updateShiftRegister(3);
  delay(delayMins * 60 * 1000); // Desired time delay

  // State 23
  leds[0] = B00001000;  // North
  updateShiftRegister(0);
  leds[1] = B00001000;  // East
  updateShiftRegister(1);
  leds[2] = B00001000;  // South
  updateShiftRegister(2);
  leds[3] = B00010011;  // West
  updateShiftRegister(3);
  delay(delayMins * 60 * 1000); // Desired time delay

  // State 24
  leds[0] = B00001100;  // North
  updateShiftRegister(0);
  leds[1] = B00001000;  // East
  updateShiftRegister(1);
  leds[2] = B00001000;  // South
  updateShiftRegister(2);
  leds[3] = B00010111;  // West
  updateShiftRegister(3);
  delay(delayMins * 60 * 1000); // Desired time delay

  }