Sigalert.com is a free web app for the iPhone that lets you view real-time traffic speeds and incidents. Sigalert lists popular freeways in California and Arizona and gives you the ability to automatically track your location using your phone’s GPS receiver. After you get to your freeway, Sigalert lists all the ramps and the speed in MPH that traffic is travelling at those exits, including any hazards and traffic conditions. Try with TestiPhone