We bugged out over a week ago. Reached N. Laredo Saturday around 11am, waited in line about an hour for customs. Steaming north our vehicle broke down in Tennessee - delayed us 4 days. Back on the road Thursday around 1PM, drove with just a few hours of fitful sleep at truck stops and off ramps. Traffic fairly moderate, lots of truck traffic. Saw a lot of Canadians from Quebec, New Brunswick, Nova Scotia towing trailers back before the Canadian border closes. Plenty of gasoline and diesel. Most sit down restaurants were either closed or take out only.
It's doable and not at all like hurricane evacuations. A lot of people are off the road already.