That equals about right........ Regardless of your assertion there are more than one road out of NO. But your one road at 1.3 million and Houston 4 million with 4 roads.....
Add to the above US 90 & 61, I-49 north out of Lafayette.
Okay, here it is again. To get out of the City of New Orleans or even the New Orleans area I-10 is the best and only safe route. BTW-HWY 90 was Closed via sand bags at the Jefferson-St. Charles Parish Line by Saturday afternoon.
Do you expect the people of New Orleans to teletransport themselves to Lafayette just before getting on I-49?
I-10 East to 59 Bottle Necks in Mississippi. Remember, the people of MS are evacuating too.
Over the lake? No way!