Toward the development of a field methodology for evaluating discomfort glare from automobile headlamps.

The aim of the research was to collect information and experimental data toward the development of a universally acceptable methodology for evaluating discomfort glare from vehicle headlamps. Three separate studies were performed: a worldwide survey of experts in headlighting and vision, soliciting opinions on desirable aspects of such a methodology; and field evaluations of a proposed methodology at speeds of 50 km/hr and 100 km/hr. The findings of this research suggest that the proposed methodology, which is easy to set-up and implement, provides relatively reliable and valid measures of discomfort glare, and is time-efficient with respect to data collection.