Limits for Directions with Transit Travel Mode

Question

I'm trying to get 4 directions with "Transit" Travel Mode in a Map. But a limitation of 3 "transit" calls per pageview was identified. I was wondering if there was something wrong with my code, or if this limitation exists in the paid version of the Google Maps API V3.

<script>
    var directionsDisplay;
    var directionsService = new google.maps.DirectionsService();
    var map;
    var coords = [];
    var coordsIndex = 0;

    function initialize() {
        directionsDisplay = new google.maps.DirectionsRenderer();
        var chicago = new google.maps.LatLng(41.850033, -87.6500523);
        var mapOptions = {
            zoom: 7,
            mapTypeId: google.maps.MapTypeId.ROADMAP,
            center: chicago
        }
        map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);
        directionsDisplay.setMap(map);

        coords.push("-23.544721,-46.784817");
        coords.push("-23.571372,-46.644323");
        coords.push("-23.509219,-46.602631");
        coords.push("-23.512052,-46.343422");
        coords.push("-23.719354,-46.41552");
        coordsIndex = 0;
        calcRoute();

    }

    function calcRoute() {

        var start = coords[coordsIndex];
        var end = coords[coordsIndex + 1];

        var request = {
            origin: start,
            destination: end,
            travelMode: google.maps.DirectionsTravelMode.TRANSIT
        };
        directionsService.route(request, function (response, status) {
            coordsIndex++;
            if (status == google.maps.DirectionsStatus.OK) {
                directionsDisplay.setDirections(response);

                var description = '';
                for (ndxRoute = 0; ndxRoute < response.routes.length; ndxRoute++) {

                    var route = response.routes[ndxRoute];

                    for (ndxLeg = 0; ndxLeg < route.legs.length; ndxLeg++) {

                        var leg = route.legs[ndxLeg];

                        if (description != '') description += '<br />';
                        description += leg.start_location + ' -> ' + leg.end_location + '<br />';

                        for (ndxStep = 0; ndxStep < leg.steps.length; ndxStep++) {
                            var step = leg.steps[ndxStep];
                            description += '    ' + step.instructions + '<br />';
                        }
                    }

                }

                document.all['instructions'].innerHTML += description;
            }
            else
                window.alert('Error calling route method: ' + status.toString());
        });
    }

    google.maps.event.addDomListener(window, 'load', initialize);
</script>
<style>
html, body {
  height: 100%;
  margin: 0;
  padding: 0;
}

#map-canvas, #map_canvas {
  height: 80%;
}

@media print {
  html, body {
    height: auto;
  }

  #map_canvas {
    height: 650px;
  }
}

#panel {
  position: absolute;
  top: 5px;
  left: 50%;
  margin-left: -180px;
  z-index: 5;
  background-color: #fff;
  padding: 5px;
  border: 1px solid #999;
}
</style>
<body>
    <div id="map-canvas">
    </div>
    <button id="nextButton" onclick="javascript:calcRoute()">
        Call next route</button>
    <div id="instructions">
    </div>
</body>

score 0 · Accepted Answer · answered May 20 '13 at 13:54

You can "hold off" for increasing amounts of time when you get that error. It is noticeable but seems to work for the number of routes you have.

        else if (status == google.maps.DirectionsStatus.OVER_QUERY_LIMIT) {
            coordsIndex--;
            errorCount++
            if (errorCount < 3)
              setTimeout("calcRoute()", 2000*errorCount);
        else
              window.alert('Error calling route method ['+coordsIndex+']: ' + status.toString());
        }

example

Limits for Directions with Transit Travel Mode

1 Answers1