>> 1. Route selection is very, very important. My friends (and their friends) basically looked at the map, found the shortest route to me (I-10 to Baton Rouge and Lafayette, then up I-49 to Alexandria), and followed it slavishly. This was a VERY bad idea, as something over half-a-million other folks had the same route in mind... Some of them took over twelve hours for what is usually a four-hour journey. If they'd used their heads, they would have seen (and heard, from radio reports) that going North up I-55 to Mississippi would have been much faster. There was less traffic on this route, and they could have turned left and hit Natchez, MS, and then cut across LA on Route 84. <<
I've never ever understood why New Orleanians always head for Baton Rouge. All you're doing is going west. I tried to do what the above paragraph describes but it was impossible to get TO I-55 because the State Police were out there shunting everybody to Baton Rouge, hence the average speed of three miles an hour when you were moving at all.
This of course is part of the reason one has to start moving well ahead of the landfall, before the outer effects of the storm are felt, which pushes this mythological "week people had" --- only in the comic books --- back to at the latest August 21st, three days before Katrina was even BORN.