I would like to build an app that alerts me when road traffic is high or low. Where can I get the raw data?

I'm sitting at work, waiting for traffic to die down. The thought occurred to me. I know when I want to go home, why don't I have an app that watches t开发者_运维知识库raffic for me? I also know that there are a lot of smart people on stackoverflow.

Where can I get live traffic data for the san francisco bay area region? The data source should be timely, accurate, and as high resolution as possible. I would like to build an app on top of a service, rather than watch google maps or watch another website. I would prefer that I not have to scrape the data, but I have been know to do this in the past when no other option exists.

If you limit yourself to the San Francisco area, there might be something available from 511.org

Mapquest gets their traffic information from INRIX.

TraffiCast is the definitive source, I think.

You could check out map quest's beta api http://platform.beta.mapquest.com/traffic/ not sure if it's what you need but it's clean