-- time when the DENM is deleted from the DEN management and the information related to the event is set as invalid.. If it is not provided, it indicates that the expiry time is unkown by the originator ITS station
expiryTime TimeStamp OPTIONAL, -- 6 byte
frequency INTEGER (0..255) OPTIONAL, --1 byte
frequency INTEGER (0..255) OPTIONAL, --units of 0.1 Hz
-- probability of the detected event to be true, varies from 0 to 100, with maximum value as full reliability
reliability INTEGER(0..100), -- 7 bits
-- negates the existence of an event at the event position by a third part ITS station that have received DENMs previously.