In the corridor module, accessible through Facilities & Devices -> Corridors, you can see congestion plots for every day in an entire month and every month in an entire year. The graphic below shows the congestion plots for each day in September 2010 along SR-91 East in Orange County. The horizontal axis represents time while the vertical axis represents direction of travel and distance. The yellow and red colors represent areas of slow speeds. From the graph you can see that this eastbound direction experiences most of its congestion in the afternoon, and a potential bottleneck is visible for most weekdays in the month. Which weekday is a holiday? Find the weekday with no congestion and you will have the answer.
Note: If you can’t see the image below clearly, click on it to see an enlarged version.