Proposal to insert a definition of Observer Rating of Drowsiness (ORD) as a methodology for assessing driver drowsiness, amend paragraphs 5.5.2. and 5.5.2.1. to establish drowsiness warning thresholds using both the Karolinska Sleepiness Scale and ORD, amend Annex 4 to include ORD validation requirements including assessor training with minimum concordance rate of 0.70, rating procedures with at least 2 assessors, measurement intervals of 5 minutes or less, video quality standards, and calculation of final ratings as averages of assessors’ ratings, amend paragraph 6.3.1. to permit alternative measurement methods including sleep video analysis by at least 3 sleep experts, amend paragraph 6.3.2. to require evidence of validity and equivalence to KSS levels, delete former paragraph 6.3.2.1., amend paragraph 6.4.1. to permit complementary measurements, and amend paragraphs 7, 7.1., 7.2., and 8.1. to establish equivalence requirements between alternative measurements and KSS or ORD thresholds.