Leaflet Try It Now Routing Single Line

var map;
                var dir;

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

dir = MQ.routing.directions();

dir.route({
                    locations: [
                        '1600 pennsylvania ave, washington dc',
                        '935 pennsylvania ave, washington dc'
                    ]
                });

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

Routing with Single-Line Addresses