During the 2009 presidential inauguration, thousands of ticketholders were trapped in the Third Street tunnel. Others had trouble getting in and out of parking garages.
That's why inauguration officials planning this year's event are making crowd control a top priority. They plans to have additional staff on hand and more street signs in place to help prevent pedestrian jams.
Planners will also have more magnetometers to speed up security lines and the Third Street Tunnel will be closed.
Committee staff members say they will use social media to monitor any delays that do occur.