@app.route('/populate_simulation', methods=['POST'])
def populate_simulation():
    data = request.get_json()
    vehicle_count = data.get('vehicles', 10)
    walker_count = data.get('walkers', 10)

    # Spawn Vehicles
    for _ in range(vehicle_count):
        vehicle_bp = random.choice(world.get_blueprint_library().filter('vehicle.*'))
        spawn_point = random.choice(world.get_map().get_spawn_points())
        world.spawn_actor(vehicle_bp, spawn_point)

    # Spawn Walkers
    for _ in range(walker_count):
        walker_bp = random.choice(world.get_blueprint_library().filter('walker.pedestrian.*'))
        spawn_point = random.choice(world.get_map().get_spawn_points())
        world.spawn_actor(walker_bp, spawn_point)

    return jsonify({'message': f'{vehicle_count} vehicles and {walker_count} walkers added'})