squidfrog writes "Yahoo is set to support realtime traffic overlays for its existing Yahoo! Maps program. 'Yahoo's dynamic maps draw on real-time traffic information from metropolitan transportation departments and private providers, including embedded road sensors, traffic cameras, police scanners, and traffic helicopters. Yahoo declined to identify the exact sources of its traffic data... Roadways are colored green, yellow and red, to highlight the normal movement of traffic, minor delays or severe road congestion. A user can hover over a stretch of road to view details of impediments.'"