This disclosure is directed to data prioritization, storage and protection in a vehicular communication system. A black box (BB) in a vehicle may receive data from an on-board unit (OBU) and a vehicular control architecture (VCA). The OBU may interact with at least one RSU that is part of an intelligent transportation system (ITS) via at least two channels, at least one of the at least two channels being reserved for high priority messages. The OBU may transmit ITS data to the BB via a secure communication channel, which may be stored along with vehicular data received from the VCA in encrypted form. In response to a request for data, the BB may authenticate a requesting party, determine at least part of the stored data to which the authenticated party is allowed and sign the at least part of the stored data before providing it to the authenticated party.