Hurricane Evacuation Routes
A little suggestion for emergency management officials in Texas: Why don't you read what Alabama and Florida do for evacuations, especially concerning making major roads one-way?
When we need to evacuate officials announce the evacuation and announce the time at which they are going to turn roads one-way to facilitate evacuation. The Department of Transportation takes care of the signage and it is done by starting inland and working towards the coast to flush out the traffic already on the road.
It's really simple to do and it doesn't require specialized training. You also do it early in the evacuation to get people out of the way. The longer you wait, the greater the risk of creating parking lots on Interstates.