An automotive emergency response system (AERS) for aftermarket devices defined in the Recommendation ITU-T Y.4119 is designed to bring rapid assistance to driver and/or passengers involved in accidents. For a normal operation purpose of the AERS, an accident related data (so-called minimum set of data, MSD) needs to be sent from an automotive emergency detection device (AEDD) to an automotive emergency response center (AERC). An MSD includes mandatory information and optional information. Mandatory information of an MSD is a set of information that shall be included in an MSD when an AEDD performs normal operation. Optional information of an MSD is a set of information on an accident that can be additionally included to give more information to AERC. This Recommendation specifies an MSD structure and encoding rule for an AERS.