The regulation states that the DDAW (Driver Drowsiness and Attention Warning) solution needs to detect and provide a warning when drivers reach a KSS level of 8 or higher. These systems are validated against test participants who provide self-reported KSS values. This means when the test starts, two measurements will be collected independently and in tandem: the DDAW and the participant’s KSS. Measurement intervals will need to be in 5-minute intervals once the participant reports a KSS of 6 or higher.
Some of the testing requirements of interest are…
Each test participant must generate at least 1 True Positive or 1 False Negative event (all scenarios must be accounted and included in the final analysis).
- Testing ends when the participant returns a KSS of 8 or higher (with the provision to obtain one more KSS measurement; more on this later).
- After resting, participants can restart the test to gather more data (this is considered a different dataset).
- The total number of True Positives and False Negatives must be 10 or greater.
- The total number of participants must be 10 or greater (they can test on multiple sessions but count as a single participant)
- Testing is performed in the day and night conditions and record at least a True Positive event in each condition.
During these validation tests, there are two main scenarios of interest:
- True Positive: DDAW produced a warning when the participant reported being drowsy
- False Negative: DDAW did not produce a warning when the participant reported being drowsy
True Positives are good. The most straightforward and preferred scenario would be if the DDAW produced a warning when the participant reported a KSS of 8 or higher. The regulation allows for two other True Positive contingencies whereby if the DDAW produces a warning, the participant reported a KSS of 7 in the 5 minutes before or after the warning was given.
|There is a direct linear relationship between KSS and Optalert’s JDS™.
So, we simply take your measurement data, validate it with our objective JDS and directly map that score to KSS, giving you accurate, reliable, effective compliance based on a world leading solution.GSR Compliance is easy with Optalert.