48 1-5 Event Data Recorder (EDR) System Data Element Meaning Purpose Square, maximum delta-V, resultant Maximum value of the sum of the squares of longitudinal and later delta-Vs To analyze the square of the maximum resultant delta-V at the time when the crash event occurred Time, maximum delta- V, lateral Time from time zero to the point where the maximum value of the cumulative change in velocity is found, as recorded by the EDR, along the y axis, which should be used in combination with “maximum delta-V, lateral” To analyze the time to the maximum lateral delta-V at the time when the crash event occurred Time, square, maximum delta-V, resultant Time from time zero to the point where the maximum resultant delta-V is found, which should be used in combination with “square, maximum delta-V, resultant” To analyze the time to the square of the maximum resul- tant delta-V at the time when the crash event occurred Yaw rate Change in angle of the vehicle relative to the z axis prior to and after the event, which is recorded as positive in the clockwise direction and is applicable to vehicles with an electronic stability control system To analyze the stability of the electronic vehicle control system at the time when the crash event occurred Steering angle Angular coordinate of the steering wheel.
On the coordi- nate, the zero value (0°) indicates that the steering wheel was in the middle position (vehicle traveling straight) and a positive value indicates that the steering wheel was turned anticlock- wise (leftward). This data is applicable to vehicles installed with a steering angle sensor. To analyze the status of the steering wheel at the time when the crash event occur- red