From their site: Traffic Web Services from Yahoo! enable you to get traffic alert information from a given location. Use the Traffic REST API to customize your request with many parameters including indicating locations based on city state, zip code, or a combination of any of these things, latitude-longitude, whether to include a map image, or a search radius in miles. Traffic Web Services are also available through a [[http://developer.yahoo.net/traffic/rss/V1/index.html dynamic RSS feed]].
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So far, we don't have a record of any changes to this API