Was schedualed to go pick up oil in houston tonight/tomorrow. That was canceled due to all major routes out of the coast being all 1 way and all clogged up. Still, there are minor ways out. Pull up mapquest and follow FM (Farm to Market) and CR's (Country Roads). I've found hauling gravel that you can get anywhere on backroads. Might be worth checking out anyways.
Was planned to go to ardmore Oklahoma to pick up oil tonight till tomorrow nigh. That was canceled due to I-35 being all northbound. no way home. can't take a loaded tanker truck down the backroads. All routes outbound of the dallas and san-antonio areas are blocked (Exception is westbound I-10 past san antonio).
Now plans are shot all to hell and i'll prolly be hauling DF-blend all day tomorrow, and be shut down till tuesday due to the rain. Luckily the storm keeps tracking more and more east for landfall.
As bad as it may sound, I would have prefered it hitting New Orleans again. Everything is already destroyed, it's 99% evacuated already from katrina. less damage less deaths. Course it coulda hit some damned desert along the mexican coast and been better off.
All in All, You should investigate alternate routes out of the area, but have enough gas to get away from the area. 200 miles would be plenty far if you went west. If your stuck riding it out, Do find someplace sturdier than a house. Check your local library. Those are usually built to withstand a nuclear blast and are certified bomb shelters.