A method of obtaining data relating to a driver assistance system installed on a vehicle, including capturing sensory data (such as images) external to the vehicle via a sensor of the driver assistance system, buffering a first group of vehicle signals and storing a pre-event value for a signal of the first group in a pre-event buffer, and analyzing the sensory data to detect one or more types of probability events. After a probability event is detected, the method includes monitoring a second group of vehicle signals for a post-event time period after the occurrence of the detected probability event, and during the post event time period processing signals of the second group with a predetermined function to generate a post-event signal value, and recording data in a memory, with the recorded data including the type of detected probability event, a pre-event signal value and a post-event signal value.