"In New Orleans, Mayor LaToya Cantrell announced Friday evening that the National Weather Service and Gov. John Bel Edwards have indicated there is no time for implementing contraflow traffic, meaning the city cannot issue a mandatory evacuation for areas inside the levee system."
https://www.google.com/amp/s/amp.cnn.com/cnn/2021/08/27/us/new-orleans-hurricane-ida-preparations/index.html