There are twenty five (25) corridors radiating from downtown Washington, DC designated as emergency event/evacuation routes. Each of the routes extends to the Capital Beltway (I-495) and beyond.

Pennsylvania Avenue, NW, between Rock Creek Park and the US Capitol serves as the dividing line for egress routes. When evacuation is ordered, motorists north of Pennsylvania Avenue will be directed North, East, and West on radial evacuation routes; motorists south of Pennsylvania Avenue will be directed South, East, and West on radial evacuation routes. None of the evacuation routes cross and no vehicles will be permitted to cross Pennsylvania Avenue during an emergency evacuation.

During a major event or emergency situation, traffic signals on each route will be recalibrated to operate on a cycle length of 240 seconds (4 minutes) with maximum green time allocated to the main street. Signalized intersections between these selected traffic signals will be operated on flash with yellow for the main street and red for the side street. In addition, 70 critical intersections on the evacuation routes within Washington, DC will be manned with uniformed police officers to expedite the flow of traffic and to prevent bottlenecks.