title: Displaying multiple routes on a google map
body: <p>I am trying to display multiple routes on same map but am unable to do so.</p>
  
  <p>No matter what I do I get only one route.</p>
  
  <pre><code>function calcRoute() {
          var start = document.getElementById('start').value;
          var end = document.getElementById('end').value;
          var request = {
            origin: start,
            destination: end,
            travelMode: google.maps.DirectionsTravelMode.DRIVING
          };
          directionsService.route(request, function(response, status) {
            if (status == google.maps.DirectionsStatus.OK) {
              directionsDisplay.setDirections(response);
            }
          });
        }
  </code></pre>
  
  <p>Any pointers will be helpful.</p>