Google maps api highway vs road distance - google-maps-api-3

Question

I am using google maps api to calculate the rout from point A to point B.
The 'The DirectionsResult' object is giving me a lot of info regarding distance etc.
https://developers.google.com/maps/documentation/javascript/directions#DirectionsResults
However, I am interested to know what is the distance (part of the) route is on HIGHWAY roads and what part is in the CITY roads.
How can I do that?
Thanks!

Answer 1

There is no way using the API to differentiate between highways and non-highways.
However, you can assume the difference yourself by calculating the speed for each leg in the route.
Meta code:
// find meters per second and convert to miles per hour
mph = (route.leg[i].distance.value / route.leg[i].duration.value) * 2.23694
if mph >= 55
route.leg[i].road = highway
else
route.leg[i].road = city
Obviously this will not work if the results are taking traffic conditions into account.
example
var infowindow = new google.maps.InfoWindow();
var directions = new google.maps.DirectionsService();
var renderer = new google.maps.DirectionsRenderer({
suppressPolylines: true,
infoWindow: infowindow,
});
var map;
function initialize() {
var mapOptions = {
zoom: 13,
center: new google.maps.LatLng(40.7482333, -73.8681295),
mapTypeId: google.maps.MapTypeId.ROADMAP
};
map = new google.maps.Map(document.getElementById('map'), mapOptions);
google.maps.event.addDomListener(document.getElementById('go'), 'click',
route);
route();
}
function route() {
var request = {
origin: document.getElementById('from').value,
destination: document.getElementById('to').value,
travelMode: google.maps.DirectionsTravelMode.DRIVING
};
var panel = document.getElementById('panel');
panel.innerHTML = '';
directions.route(request, function(response, status) {
if (status == google.maps.DirectionsStatus.OK) {
renderer.setDirections(response);
renderer.setMap(map);
renderer.setPanel(panel);
renderDirectionsPolylines(response);
console.log(renderer.getDirections());
} else {
renderer.setMap(null);
renderer.setPanel(null);
}
});
}
var polylineOptions = {
strokeColor: '#C83939',
strokeOpacity: 1,
strokeWeight: 4
};
var polylines = [];
function renderDirectionsPolylines(response) {
for (var i = 0; i < polylines.length; i++) {
polylines[i].setMap(null);
}
var legs = response.routes[0].legs;
for (i = 0; i < legs.length; i++) {
var steps = legs[i].steps;
for (j = 0; j < steps.length; j++) {
// find meters per second and convert to miles per hour
var mph = (steps[j].distance.value / steps[j].duration.value) * 2.23694
if (mph >= 55) {
// route.leg[i].road = highway
color = "#FF0000";
} else {
// route.leg[i].road = city
color = "black";
}
console.log("step " + j + " color=" + color + " mph=" + mph + " dist=" + steps[j].distance.value + " meters/time=" + steps[j].duration.value + " seconds");
var nextSegment = steps[j].path;
polylineOptions.strokeColor = color;
var stepPolyline = new google.maps.Polyline(polylineOptions);
for (k = 0; k < nextSegment.length; k++) {
stepPolyline.getPath().push(nextSegment[k]);
}
polylines.push(stepPolyline);
stepPolyline.setMap(map);
// route click listeners, different one on each step
google.maps.event.addListener(stepPolyline, 'click', (function(mph) {
return function(evt) {
infowindow.setContent("you clicked on the route<br>speed ~= " + mph.toFixed(2) + " mph<br>" + evt.latLng.toUrlValue(6));
infowindow.setPosition(evt.latLng);
infowindow.open(map);
}
}(mph)));
}
}
}
google.maps.event.addDomListener(window, 'load', initialize);
html,
body {
height: 100%;
padding: 0;
margin: 0;
color: black;
font-family: arial, sans-serif;
font-size: 13px;
}
#map {
position: absolute;
top: 0;
bottom: 0;
left: 0;
right: 50%;
}
#panel-wpr {
position: absolute;
top: 0;
bottom: 0;
left: 50%;
right: 0;
overflow: auto;
}
#panel {
font-family: arial;
padding: 5px 5px;
}
#info {
padding: 5px;
}
#from,
#to {
width: 90%;
font-size: 1.2em;
}
.adp-directions {
width: 100%;
}
.input {
background-color: white;
padding-left: 8px;
border: 1px solid #D9D9D9;
border-top: 1px solid silver;
-webkit-border-radius: 1px;
-moz-border-radius: 1px;
border-radius: 1px;
}
.time {
margin: 0;
height: 17px;
border: 1px solid;
border-top-color: #CCC;
border-right-color: #999;
border-left-color: #999;
border-bottom-color: #CCC;
padding: 2px 15px 1px 1px;
}
button {
border: 1px solid #3079ED;
color: white;
background-color: #4D90FE;
background-image: -webkit-gradient(linear, left top, left bottom, from(#4D90FE), to(#4787ED));
background-image: -webkit-linear-gradient(top, #4D90FE, #4787ED);
background-image: -moz-linear-gradient(top, #4D90FE, #4787ED);
background-image: -ms-linear-gradient(top, #4D90FE, #4787ED);
background-image: -o-linear-gradient(top, #4D90FE, #4787ED);
background-image: linear-gradient(top, #4D90FE, #4787ED);
filter: progid: DXImageTransform.Microsoft.gradient(startColorStr='#4d90fe', EndColorStr='#4787ed');
display: inline-block;
min-width: 54px;
text-align: center;
font-weight: bold;
padding: 0 8px;
line-height: 27px;
-webkit-border-radius: 2px;
-moz-border-radius: 2px;
border-radius: 2px;
-webkit-transition: all 0.218s;
-moz-transition: all 0.218s;
-o-transition: all 0.218s;
transition: all 0.218s;
}
#info div {
line-height: 22px;
font-size: 110%;
}
.btn {} #panel-wpr {
border-left: 1px solid #e6e6e6;
}
#info {
border-bottom: 1px solid #E6E6E6;
margin-bottom: 5px;
}
h2 {
margin: 0;
padding: 0;
}
<script src="https://maps.googleapis.com/maps/api/js"></script>
<div id="map"></div>
<div id="panel-wpr">
<div id="info">
<div>
<label>from:</label>
<input id="from" value="New York, NY" />
</div>
<div>
<label>to:</label>
<input id="to" value="Philadelphia, PA" />
</div>
<div class="btn">
<button id="go">Get Directions</button>
</div>
</div>
<div id="panel"></div>
</div>