$scope.createAvl = function () {
    console.log($scope.avl); // for debug
    $scope.avl.push({
        'tracker_avl_id': getRandomArbitrary(0, 1000000, 1),
        'car_id': getRandomArbitrary(0, 10000, 1),
        'x_lat': getRandomArbitrary(-69, -66, 0),
        'y_long': getRandomArbitrary(8, 10, 0),
        'azimuth': getRandomArbitrary(0, 359, 1),
        'event_time': getRandomDate()
    });
};

$scope.saveAvl = function () {
    var data = $.param({
        avl_list: $scope.avl
    });

    var config = {
        headers: {
            'Content-Type': 'application/x-www-form-urlencoded;charset=utf-8;'
        }
    };

    $http.post('/Avl_Api/traffic_tracker_avl/putTrafficAvl', data, config)
    .success(function (data, status, headers, config) {
        console.log('Sucess.....');
    })
    .error(function (data, status, header, config) {
        $scope.ResponseDetails = "Data: " + data +
            "<hr />status: " + status +
            "<hr />headers: " + header +
            "<hr />config: " + config;
    });
};

public partial class traffic_tracker_avl
{
    public int avl_id { get; set; }
    public long tracker_avl_id { get; set; }
    public long car_id { get; set; }
    public decimal x_lat { get; set; }
    public decimal y_long { get; set; }
    public int azimuth { get; set; }
    public System.DateTime event_time { get; set; }
    public Nullable<System.DateTime> created_at { get; set; }
}

[HttpPost]
public JsonResult putTrafficAvl(List<traffic_tracker_avl> avl_list)
{
    avl_list.ForEach(n => db.traffic_tracker_avl.Add(n));
    db.SaveChanges();
}