Google Maps in China (Ditu) has created a really cool traffic and road closures mapplet for the National Day of the People's Republic of China celebrations in Beijing.
What I really like about this mapplet is its use of a calendar, to enable users to view the road closures on different days. Clicking on any day in the calendar will load the road restrictions for that day. The map uses simple color coding for different restrictions. The red polylines and markers indicate that these roads are completely closed.