Ala. Code § 11-54B-15

Any movable furniture, structure, facility, or appurtenance or activity located or permitted in connection with a self-help business improvement district shall not, by reason of such location or use, be deemed a nuisance or unlawful obstruction or condition, notwithstanding any rule or regulation or principle of negligence law pertaining to the use of public streets and highways and neither the municipality nor any user acting under permit shall be liable for any injury to person or property, unless such furniture, structure, facility or use shall be negligently constructed, maintained, or operated.