Some people call them 'medians' but in battle hardened New Orleans they're called 'neutral ground.'
Sources
New Orleans 101: Why do we call it a 'neutral ground' instead of a 'median'? http://www.nola.com/living/index.ssf/2016/05/new_orleans_neutral_ground_238972871.html
NOLA Speak: The New Orleans Neutral Ground
http://gonola.com/2013/03/05/nola-speak-the-new-orleans-neutral-ground.html
"Whiskey on the Mississippi" Kevin MacLeod (incompetech.com) Licensed under Creative Commons: By Attribution 3.0 http://creativecommons.org/licenses/by/3.0/