How to move a marker smoothly without blinking on the map

I have a problem with my markers every time I get a request to our server to get the new location of my devices and update the position of my markers on the map, when my vehicles move, the marker will go to the new location and flicker. How can I avoid this so that it doesn't flicker, or my Marker can move smoothly.

Thanks in advance.

var map;
var marker;
var markerarray =[];

setInterval(function(){

    $.ajax({
        type: "post",
        url: "vehiclecordinates.php",
        success: function(data){

            coordinates = data.latlng;
            vehiclename = data.vehiclename;

            for (var i = 0; i < coordinates.length; i++) {

                newcoordinate = new google.maps.LatLng(coordinates[i].split(",")[0],coordinates[i].split(",")[1]);
                marker =  new MarkerWithLabel({
                     map:map,
                     labelClass: "mylabels",
                     labelStyle: {opacity: 1.0},
                     labelContent: '<div>'+ vehiclename[i]+'</div>',
                     icon:{
                         //some options here
                     },
                });

                marker.setPosition(newcoordinate);
                markerarray.push(marker);
            }
        }
    });

    setTimeout(function () {
        removeMarkers();
        delete marker;
    }, 1000);
},5000);

function removeMarkers() {
    for(var i = 0; i < markerarray.length; i++) {
        markerarray[i].setMap(null);
    }
}