const int redLight1 = 10;   
const int yellowLight1 = 9; 
const int greenLight1 = 8; 

const int redLight2 = 7;   
const int yellowLight2 = 6; 
const int greenLight2 = 5; 

void setup() {
  // Set all traffic light pins as OUTPUT
  pinMode(redLight1, OUTPUT);
  pinMode(yellowLight1, OUTPUT);
  pinMode(greenLight1, OUTPUT);
  
  pinMode(redLight2, OUTPUT);
  pinMode(yellowLight2, OUTPUT);
  pinMode(greenLight2, OUTPUT);
}

void loop() {
  // Green light for traffic light 1 and red light for traffic light 2
  digitalWrite(greenLight1, HIGH);
  digitalWrite(redLight2, HIGH); 
  delay(5000);  // Wait for 5 seconds

  // Yellow light for both traffic lights
  digitalWrite(greenLight1, LOW); // Turn off green light 1
  digitalWrite(redLight2, LOW);   // Turn off red light 2
  digitalWrite(yellowLight1, HIGH);
  digitalWrite(yellowLight2, HIGH);
  delay(2000); // Wait for 2 seconds

  // Turn off yellow lights
  digitalWrite(yellowLight1, LOW);
  digitalWrite(yellowLight2, LOW);
  
  // Green light for traffic light 2 and red light for traffic light 1
  digitalWrite(greenLight2, HIGH);
  digitalWrite(redLight1, HIGH); 
  delay(5000);  // Wait for 5 seconds

  // Yellow light for both traffic lights
  digitalWrite(greenLight2, LOW); // Turn off green light 2
  digitalWrite(redLight1, LOW);   // Turn off red light 1
  digitalWrite(yellowLight2, HIGH);
  digitalWrite(yellowLight1, HIGH);
  delay(2000); // Wait for 2 seconds

  // Turn off yellow lights
  digitalWrite(yellowLight2, LOW);
  digitalWrite(yellowLight1, LOW);
}