By now, officials should know that mass evacuations over 2-3 days from large urban centers are impossible. Four million in metro Houston. 'Mandatory' evacuation from low-lying areas only ordered at 6:00AM today (Sept. 22).

Gridlock on the highway (and at the airport). Sad to see traffic frozen on the highways.
Cars running out of gas. Gas station tanks empty and shut down. Summer heat. Four lanes of Hell. Lanes in to Houston not changed to outward as of this hour, but that would just lead to gridlock further up the road. The police chief sounds optimistic, but we shall see.
How many will die on the road?

Thirty-six hours to landfall?