What You Need to Know About GSR Requirements

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).

  1. 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).
  2. After resting, participants can restart the test to gather more data (this is considered a different dataset).
  3. The total number of True Positives and False Negatives must be 10 or greater.
  4. The total number of participants must be 10 or greater (they can test on multiple sessions but count as a single participant)
  5. 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:

  1. True Positive: DDAW produced a warning when the participant reported being drowsy
  2. 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.

Graph showing direct linear relationship between the Karolinska Sleepiness Scale and the Johns Drowsinsess Scale

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.