This is from the article I posted to start this thread:
Officials said that the evacuation will be broadcast on local radio stations and that officials charged with notifying individual residents will be police officers or firefighters in uniform, driving emergency vehicles.
By today, the Illinois Valley will be sprouting new yellow signs spelling out in black: Escape Route. Oregon Department of Transportation officials plan to make U.S. 199 one way with two lanes heading north, and Oregon State Police and National Guard troops will be stationed at key intersections to allow traffic to enter from side roads. No one will be allowed to return.
EBUCK