Microsoft today announced the support for real-time traffic flow data in Bing Maps. This traffic data is now available in 55 countries. Using this data, Bing Maps provides real-time and predictive route calculations. It can also be used for color coded roads on the map to indicate the real-time flow of traffic. Bing Maps controls already provide an option to overlay real-time traffic flow data on top of the map through the Traffic module.
Point based traffic incident data such as car accidents and construction is available in 35 countries. In addition to accessing traffic incident data though the interactive Bing Maps controls, this data can also be accessed directly Bing Maps REST Services Traffic API, and through the Traffic Data Source in the Bing Spatial Data Services.
You can find the list of countries in which traffic data is available here.