This rule was put into place for the freakin idiots with the DJ spin tables and huge speakers and having them blaring so loud the whole parking lot can hear it.
I have small speakers that are extremely loud and project sound out to 200 feet but I have never had a complaint from any of my neighbors. I always make sure when we turn our speakers up that we are not bothering them and we have tailgated next to the same people for the last 5 years.
I know of one group that this rule was put in place for and its the group that has their dj system set up right in front of the yellow parking lot gate as your walking towards the stadium. Its blaring loud and after the games, their drunks azz are singing karoke. I will be happy if they shut down that group all together.
As far as the 68 decibels and the Texans trying to monitor that is going to be impossible. My generator is 10 times louder than a vacuum cleaner and according to Showtime's example list 70 decibels is the sound of a vacuum cleaner. Also according to Showtime's example list there will be no more Red Neck Margarita machines because thats 90 decibels.
Thank goodness that I have great neighbors in the yellow lot and we all know how to party!!