The reality of evacuating the WDC area is not feasible. The major evacuation routes even during non-critical times are a nightmare. Frederick, which is in the WDC evacuation plans as a relocation destination, is really only accessible via 270. On a good day, 270 is backed up. No less during an emergency. While there is limited mass transit out of the area, the number people requiring evacuation though the use of mass transit far exceeds the capacity of the system to handle. Unless you evacuate early, sheltering in place is the only option possible. For evacuating the WDC area, a 4X4 is pretty much useless.

Pete