If you’ve not left for points outside of DC, don’t delay too much longer. WTOP’s Bob Marbourg is noting that rush hour could be quite horrifying, as traffic is slowly building up and slowing down. Choke points at the moment are mainly where lane merges and interchanges occur, with backups slowly building.
Also, at Reagan National, you’ve got some spaces still available. If you’ve got late flights, check this page for lot availability.
Happy travelling and be safe!