NOPUS uses observational data collected at intersections, highway ramps, and parking lots. Four observers (each responsible for a different seat in cars, two observers for motorcycles) report occupant helmet use.
Data by race and age are not reported because race and age are subjectively assessed by roadside observers and are, therefore, considered unreliable.
The target was revised from 73.7 to 74 due to the available precision of the baseline value. The baseline value is 67, not 67.0.