Google introduces new “KmlLayer class,” that enables KML or GeoRSS files hosted on publicly accessible web sites to be rendered in a Maps API v3 application. “KmlLayer class is just one of several new layer classes we’re adding to Maps API v3 today. A layer class handles a collection of overlays that’re added to map as a single entity. In addition to KmlLayer class, we’re also adding ‘TrafficLayer class and BicyclingLayer’ class. TrafficLayer class adds real time color coding of traffic speed on highways and major arterial roads. And BicyclingLayer class adds information about bike trails, lanes and recommended roads for bicyling onto the map: A dark green line indicates a dedicated bike-only trail; A light green line indicates a dedicated bike lane along a road; A dashed green line indicates roads that are designated as preferred for bicycling, but without dedicated lanes.