Seems to me you're the only one not getting it. The OP was talking about the roads around the airport in Delaware as related to him by a lawyer from Delaware. You've said that you don't buy it and then you start talking about the roads around DC's Andrews Air Base. A totally different location.
You say that you haven't seen or heard anything from family members about the traffic being blocked around DC's Andrews Air Base and that's probably because the President is transported from the WH to the base via Marine One as was pointed out up thread which shouldn't hamper traffic.
Now when he lands in Delaware it would only stand to reason that traffic around the area would be hampered because he would need to be transported via motorcade to his home and that is what the OP was talking about. Didn't have anything to do with what you're talking about. You're the one that veered off and made it about DC.
Seems to me I admited a few posts back that I was talking about DC and the story was about Delaware. Is it that difficult to understand I was incorrect. Apparently it is.