This article analyses sound indicators as compulsory elements that separate information content from commercial content in order to preserve the rights of consumers and following the legal regulations and codes of conduct. The study has been carried out using a sample of 372 intersection spaces broadcast by the most popular Spanish commercial generalist radio stations and coded following certain variables such as time slot, commercial content, audio signal input separation and audio signal output separation. The results provide substantial evidence regarding the lack of social responsibility of radio owners towards their audience as well as the passivity with which government and self-regulation bodies protect the rights of listeners to be warned of the commercial nature of these radio broadcasts.