Leaflet Try It Now Open Routing

var map,
                    dir;

map = L.map('map', {
                  layers: MQ.mapLayer(),
                  center: [ 38.895345, -77.030101 ],
                  zoom: 15
                });

dir = MQ.routing.directions();

dir.route({
                    locations: [
                        'New York, NY',
                        'Washington, DC'
                    ]
                });

map.addLayer(MQ.routing.routeLayer({
                    directions: dir,
                    fitBounds: true
                }));
            }
        </script>
    </head>