Google Maps JavaScript API v3

Traffic layer

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JavaScript
function initialize() {
  var myLatlng = new google.maps.LatLng(34.04924594193164, -118.24104309082031);
  var mapOptions = {
    zoom: 13,
    center: myLatlng
  }

  var map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);

  var trafficLayer = new google.maps.TrafficLayer();
  trafficLayer.setMap(map);
}

google.maps.event.addDomListener(window, 'load', initialize);
JavaScript + HTML
<!DOCTYPE html>
<html>
  <head>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
    <meta charset="utf-8">
    <title>Traffic layer</title>
    <style>
      html, body, #map-canvas {
        height: 100%;
        margin: 0px;
        padding: 0px
      }
    </style>
    <script src="https://maps.googleapis.com/maps/api/js?v=3.exp&sensor=false"></script>
    <script>
function initialize() {
  var myLatlng = new google.maps.LatLng(34.04924594193164, -118.24104309082031);
  var mapOptions = {
    zoom: 13,
    center: myLatlng
  }

  var map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);

  var trafficLayer = new google.maps.TrafficLayer();
  trafficLayer.setMap(map);
}

google.maps.event.addDomListener(window, 'load', initialize);

    </script>
  </head>
  <body>
    <div id="map-canvas"></div>
  </body>
</html>

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