The Colorado Department of Transport is using Google Maps to display live traffic conditions for Denver. The site has four separate maps; one showing road conditions, one showing the current average speeds on roads, one that displays current road works in the city and another that lets you view the messages currently displayed on road signs.
Traffic conditions for the map is provided by the Intelligent Transportation Systems (ITS) a branch of CDOT. The maps also include live traffic web cams, information from local weather stations and travel alerts.
City of Ottawa Interactive Traffic Map
The City of Ottawa has a new interactive traffic map which uses Google Maps to provide comprehensive traffic information for the city.
The map includes information about traffic incidents, construction and events, parking lot location and vacancy; and also displays streaming web cams for major intersections. Live data feeds provide up-to-the-minute Ottawa traffic details. The site even lets you view the messages currently displayed on the city's road signs.