This is the code I am using to draw the map
 
var directionDisplay;
var directionsService = new google.maps.DirectionsService();
var startlatlng = new google.maps.LatLng(50.067, -5.717);
var endlatlng = new google.maps.LatLng(58.633, -3.067);
var map;

function init() {
    directionsDisplay = new google.maps.DirectionsRenderer();
    var latlng = new google.maps.LatLng(54.6, -4.25);
    var myOptions = { zoom: 6, center: latlng, disableDefaultUI: true, 
mapTypeId: google.maps.MapTypeId.ROADMAP };
    var map = new google.maps.Map(document.getElementById("map_canvas"), 
myOptions);
    directionsDisplay.setMap(map);
    calcRoute();
}

function calcRoute() {
    var request = {
        origin: startlatlng,
        destination: endlatlng,
        avoidHighways: true,
        travelMode: google.maps.DirectionsTravelMode.DRIVING
    };

    directionsService.route(request, function (response, status) {
        if (status == google.maps.DirectionsStatus.OK) {
            directionsDisplay.setDirections(response);
        }
    });
}

google.maps.event.addDomListener(window, 'load', init);

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