Edit in JSFiddle

JavaScript
HTML
CSS
Result

function initialize()
{
    var map = new google.maps.Map(document.getElementById("map"),
    {
        zoom: 13,
        center: new google.maps.LatLng(34.04924594193164, -118.24104309082031),
        mapTypeId: google.maps.MapTypeId.ROADMAP
    });

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

<html>
<head>
<title>Google Maps API v3 Example : Live Traffic Layer</title>
<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false"></script>
<script type="text/javascript">
</script>
</head>
<body onload="initialize()">
<div id="map" style="width: 530px; height: 230px"></div>
</body>
</html>