It's always the blame game, when they say 'there's plenty of blame to go around' you know the blame points to them.
I don't remember the 'evac' routes but I was there back in the 60's. I just remember traffic was a bit$h back then.
The traffic hasn't changed, but the evac routes are clearly marked every 1/2 to 1 mile or so. The Houstonians can give a more accurate number for that.