 On the outer loop of the Beltway, no issues at the Woodrow Wilson Bridge. At the 14th Street Bridge, traffic is getting heavier as more folks crowd into D.C. for the fireworks. You cannot exit onto Lower 14th Street, Potomac Park, or the 12th Street Expressway. Third Street Tunnel is open. Many roads around the National Mall and Tidal Basin are completely closed to vehicular traffic. Of course, Constitution and Independence Avenues among them.