import java.util.Random;

​

// Enum to represent the traffic light states

enum TrafficLightState {

    RED, YELLOW, GREEN

}

​

// Class to represent a Traffic Light

class TrafficLight {

    private TrafficLightState state;

​

    public TrafficLight() {

        state = TrafficLightState.RED;

    }

​

    public TrafficLightState getState() {

        return state;

    }

​

    public void changeState(TrafficLightState newState) {

        state = newState;

    }

}

​

// Class to represent a Vehicle

class Vehicle {

    private String id;

​

    public Vehicle(String id) {

        this.id = id;

    }

​

    public String getId() {

        return id;

    }

}

​

// Main Traffic Management System class

public class TrafficManagementSystem {

    public static void main(String[] args) {

        TrafficLight trafficLight = new TrafficLight();

        Random random = new Random();

​

        // Simulate the traffic signal and vehicle behavior

        for (int i = 0; i < 10; i++) {

            // Change traffic light state randomly

            int randomStateIndex = random.nextInt(TrafficLightState.values().length);

            TrafficLightState newState = TrafficLightState.values()[randomStateIndex];

            trafficLight.changeState(newState);

​

            System.out.println("Traffic Light is now " + newState);

​

            // Simulate vehicles approaching the signal

            int numVehicles = random.nextInt(10);

            for (int j = 0; j < numVehicles; j++) {

                Vehicle vehicle = new Vehicle("Vehicle " + j);

                System.out.println(vehicle.getId() + " is approaching the signal.");

​

                // Check if the vehicle should stop or proceed

                if (newState == TrafficLightState.RED) {

                    System.out.println(vehicle.getId() + " must stop.");

                } else {

                    System.out.println(vehicle.getId() + " can proceed.");

                }

            }

​

            System.out.println();

        }

    }

}