Bootstrap 3 - Responsive carousel - From many slides to single slide

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js"></script>
<div class="row">
  <div class="col-md-12">
    <div class="carousel carousel-showsixmoveone slide" id="carousel123">
      <div class="carousel-inner">
        <div class="item active">
          <div class="col-xs-12 col-sm-4 col-md-4">
            <a href="#"><img src="http://placehold.it/500/0054A6/fff/&amp;text=1" class="img-responsive"></a>
          </div>
        </div>
        <div class="item">
          <div class="col-xs-12 col-sm-4 col-md-4">
            <a href="#"><img src="http://placehold.it/500/002d5a/fff/&amp;text=2" class="img-responsive"></a>
          </div>
        </div>
        <div class="item">
          <div class="col-xs-12 col-sm-4 col-md-4">
            <a href="#"><img src="http://placehold.it/500/d6d6d6/333&amp;text=3" class="img-responsive"></a>
          </div>
        </div>
      </div>
      <a class="left carousel-control" href="#carousel123" data-slide="prev"><i class="glyphicon glyphicon-chevron-left"></i></a>
      <a class="right carousel-control" href="#carousel123" data-slide="next"><i class="glyphicon glyphicon-chevron-right"></i></a>
    </div>
  </div>
</div>

CSS

.carousel-showsixmoveone .carousel-control {
  width: 4%;
  background-image: none;
}

.carousel-showsixmoveone .carousel-control.left {
  margin-left: 15px;
}

.carousel-showsixmoveone .carousel-control.right {
  margin-right: 15px;
}

.carousel-showsixmoveone .cloneditem-1,
.carousel-showsixmoveone .cloneditem-2,
.carousel-showsixmoveone .cloneditem-3,
.carousel-showsixmoveone .cloneditem-4,
.carousel-showsixmoveone .cloneditem-5 {
  display: none;
}

@media all and (min-width: 768px) {
  .carousel-showsixmoveone .carousel-inner > .active.left,
  .carousel-showsixmoveone .carousel-inner > .prev {
    left: -33.333%;
  }
  .carousel-showsixmoveone .carousel-inner > .active.right,
  .carousel-showsixmoveone .carousel-inner > .next {
    left: 33.333%;
  }
  .carousel-showsixmoveone .carousel-inner > .left,
  .carousel-showsixmoveone .carousel-inner > .prev.right,
  .carousel-showsixmoveone .carousel-inner > .active {
    left: 0;
  }
  .carousel-showsixmoveone .carousel-inner .cloneditem-1,
  .carousel-showsixmoveone .carousel-inner .cloneditem-2 {
    display: block;
  }
}

@media all and (min-width: 768px) and (transform-3d),
all and (min-width: 768px) and (-webkit-transform-3d) {
  .carousel-showsixmoveone .carousel-inner > .item.active.right,
  .carousel-showsixmoveone .carousel-inner > .item.next {
    transform: translate3d(33.333%, 0, 0);
    left: 0;
  }
  .carousel-showsixmoveone .carousel-inner > .item.active.left,
  .carousel-showsixmoveone .carousel-inner > .item.prev {
    transform: translate3d(-33.333%, 0, 0);
    left: 0;
  }
  .carousel-showsixmoveone .carousel-inner > .item.left,
  .carousel-showsixmoveone .carousel-inner > .item.prev.right,
  .carousel-showsixmoveone .carousel-inner > .item.active {
    transform: translate3d(0, 0, 0);
    left: 0;
  }
}

@media all and (min-width: 992px) {
  .carousel-showsixmoveone .carousel-inner > .active.left,
  .carousel-showsixmoveone .carousel-inner > .prev {
    left: -16.666%;
  }
 ...

JavaScript

(function() {
  // setup your carousels as you normally would using JS
  // or via data attributes according to the documentation
  // http://getbootstrap.com/javascript/#carousel
  $('#carousel123').carousel({
    interval: 2000
  });
  $('#carouselABC').carousel({
    interval: 3600
  });
}());

(function() {
  $('.carousel-showsixmoveone .item').each(function() {
    var itemToClone = $(this);

    for (var i = 1; i < 3; i++) {
      itemToClone = itemToClone.next();

      // wrap around if at end of item collection
      if (!itemToClone.length) {
        itemToClone = $(this).siblings(':first');
      }

      // grab item, clone, add marker class, add to collection
      itemToClone.children(':first-child').clone()
        .addClass("cloneditem-" + (i))
        .appendTo($(this));
    }
  });
}());