GMaps API - calc route driving into pedestrian area - api

Question

my calculated route works good so far, but I have some trouble with my destination address.
When the destination is within a pedestrian area (city center), this destination (lat, long) will set to the next valid street. This is probably how it supposed to be, but it's important that I get the route until the specific destination address. What I want: E.g. I drive into the pedestrian area or I drive as far as possible by car and then walk to the destination.
Anyone has an idea how I can solve this problem? I am using the following code, the code works so that is not the problem:
<script type="text/javascript">
var directionsDisplay = new google.maps.DirectionsRenderer({
animation: google.maps.Animation.DROP,
draggable: true
});
var directionsService = new google.maps.DirectionsService();
var map;
var geocoder;
var resultsInput;
var question;
var routeStart, routeEnd;
var travMode;
var frage_gruppen_nr;
var zsf1,zsf2;
var zentrieren;
function initialize() {
geocoder = new google.maps.Geocoder();
routeStart = $('.multiple-short-txt:eq(0) .text:eq(0)');
routeEnd = $('.multiple-short-txt:eq(0) .text:eq(1)');
coords_field_map = $('.text-short:eq(1) .text:eq(0)');
coords_field_map.hide();
zsf1 = $('.multiple-short-txt:eq(1) .text:eq(0)');
zsf2 = $('.multiple-short-txt:eq(1) .text:eq(1)');
var aktuelle_frage = 'r1';
var frage_gruppen_nr = parseInt(aktuelle_frage.substr(1));
frage_gruppen_nr = frage_gruppen_nr - 1;
if(frage_gruppen_nr>1){
routeStart.val('xxxx');
var coords;
var ziel_vorfrage = 'abc';
alert(ziel_vorfrage);
geocoder.geocode( { 'address': ziel_vorfrage}, function(results1, status1) {
if (status1 == google.maps.GeocoderStatus.OK) {
coords = String(results1[0].geometry.location)
}
});
zentrieren = new google.maps.LatLng(coords);
}else{
zentrieren = new google.maps.LatLng(49.759578, 6.644134);
}
travMode = document.getElementsByTagName("SELECT")[0];
question = '{SGQ}_c';
var mapOptions = {
zoom:12,
center: zentrieren
};
map = new google.maps.Map(document.getElementById('gmap_canvas_'+question), mapOptions);
google.maps.event.addListener(directionsDisplay, 'directions_changed', function(event) {
var directions = this.getDirections();
var overview_path = directions.routes[0].overview_path;
var startingPoint = overview_path[0];
var destination = overview_path[overview_path.length - 1];
if (typeof startLatlng === 'undefined' || !startingPoint.equals(startLatlng)) {
startLatlng = startingPoint;
getLocationName(startingPoint, function(name) {
routeStart.val(name);
});
}
if (typeof endLatlng === 'undefined' || !destination.equals(endLatlng)) {
endLatlng = destination;
getLocationName(destination, function(name) {
routeEnd.val(name);
});
}
//alert('startpoint: '+startingPoint);
calculateDistances(startingPoint, destination);
});
directionsDisplay.setMap(map);
resultsInput = $('.text-long:eq(0) .textarea');
$(resultsInput).attr('readonly', true);
}
function calcRoute() {
var coords;
var coords2;
var start = routeStart.val();
geocoder.geocode( { 'address': start}, function(results1, status1) {
if (status1 == google.maps.GeocoderStatus.OK) {
coords = String(results1[0].geometry.location)
}
else {
alert('Die Startadresse konnte nicht gefunden werden.');
}
});
var end = routeEnd.val();
geocoder.geocode( { 'address': end}, function(results2, status1) {
if (status1 == google.maps.GeocoderStatus.OK) {
coords2 = String(results2[0].geometry.location)
}
else {
alert('Die Zieladresse konnte nicht gefunden werden.');
}
});
var selectedMode;
if(travMode.value == 1){
selectedMode = 'DRIVING';
}else if(travMode.value == 2){
selectedMode = 'BICYCLING';
}else if(travMode.value == 3){
selectedMode = 'TRANSIT';
}else if(travMode.value == 4){
selectedMode = 'WALKING';
}
//
var request = {
origin:start,
destination:end,
travelMode: google.maps.TravelMode[selectedMode]
};
directionsService.route(request, function(response, status) {
if (status == google.maps.DirectionsStatus.OK) {
directionsDisplay.setDirections(response);
}
});
}
function calculateDistances(origin, destination) {
var selectedMode;
//select travel mode
if(travMode.value == 1){
selectedMode = 'DRIVING';
}else if(travMode.value == 2){
selectedMode = 'BICYCLING';
}else if(travMode.value == 3){
selectedMode = 'TRANSIT';
}else if(travMode.value == 4){
selectedMode = 'WALKING';
}
var service = new google.maps.DistanceMatrixService();
service.getDistanceMatrix({
origins: [origin],
destinations: [destination],
travelMode: google.maps.TravelMode[selectedMode],
unitSystem: google.maps.UnitSystem.METRIC,
avoidHighways: false,
avoidTolls: false
}, callback);
}
function callback(response, status) {
if (status != google.maps.DistanceMatrixStatus.OK) {
} else {
var origins = response.originAddresses;
var destinations = response.destinationAddresses;
for (var i = 0; i < origins.length; i++) {
var results = response.rows[i].elements;
for (var j = 0; j < results.length; j++) {
$(resultsInput).val('Startaddresse: '+origins[i]+'\n\nReiseziel: '+destinations[j]+'\n\nDistanz: '+results[j].distance.text+'\n\nZeit: '+results[j].duration.text+'');
//save result to fields
zsf1.val(results[j].distance.text);
zsf2.val(results[j].duration.text);
}
}
}
}
function getLocationName(latlng, callback) {
geocoder.geocode({
location: latlng
}, function(result, status) {
if (status === google.maps.GeocoderStatus.OK) {
var i = -1;
console.log(result);
// find the array index of the last object with the locality type
for (var c = 0; c < result.length; c++) {
for (var t = 0; t < result[c].types.length; t++) {
if (result[c].types[t].search('locality') > -1) {
i = c;
}
}
}
var locationName = result[0].formatted_address;
callback(locationName);
}
});
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>