Meeting report documenting discussions on proposed amendments to the driver drowsiness alert warning (DDAW) system regulation. Topics addressed include: clarification of warning acknowledgement and continued monitoring; mandatory microsleep detection as a distinct safety-critical event; expanded operating conditions for system effectiveness; interaction between DDAW and Driver Control Assistance Systems (DCAS); system performance under driver occlusions such as eyewear; drowsiness warning thresholds and advisory information; false negative event classification methodology; test participant selection and validation procedures; specificity and positive predictive value as performance metrics; and Observer Rated Drowsiness (ORD) as an alternative to KSS measurement. The IWG discussed these proposals to inform development of a 01 series of amendments to UN Regulation No. 182.