A system and method includes an automation system generating a modified content signal from a content signal by inserting insertion material into the content signal during a break and a monitoring system monitoring the content signal. The processing involves automatically finding a seed voxel or seed cell that meets the criteria and thus belongs to an irregular volume of interest, and then identifying cells related to the seed cell by one or more predetermined relationships that are therefore also to be grouped into that irregular volume. The respective airbag systems are detachable from the vehicle body, and hence, can be stored indoors.