Hmmm, this is California, traffic slows to a crawl when one dufus runs out of gas. Fortunately, a wildfire evacuation is fairly localized, so traffic issues related to the evacuation are also localized.

If there were a wide-area emergency, there is no "bugging-out" for me unless I'm hours ahead of the first wave of traffic. I've got a very high density urban area to the north, a lot of desert to the east, Mexico to the south and west it is all water. I'm working on assets to go west We're set to bug in.