The real-time data comes from a variety of sources. Yahoo! also makes traffic speed info available for about 20 cities.
In addition to finding traffic links on this page, Yahoo! also offers a shortcut. Enter traffic [city name] into the Yahoo! Search box. For example: traffic San Francisco. A direct link to the traffic info appears at the top of the results list.
Optimising Digital Marketing Campaigns with Search, Social and Analytics
At SES London (9-11 Feb) you'll get an overview of the latest tools, tips, and tactics in Paid, Owned, Earned, Integrated Media and Business Intelligence to streamline your marketing campaigns in 2015. Register by 31 October to take advantage of Early Bird Rates.