Abstract
Experiments were conducted to determine effects of Daytime Running Light (DRL) intensity on driver discomfort glare when using internal and side rearview mirrors. DRL lamps were placed behind a test vehicle as if mounted on a following vehicle. Discomfort glare was evaluated as a function of lamp intensity, vehicle/lamp geometry. Lamp-to-mirror distance, and driver age. The data did not support the hypothesis that elderly drivers would experience more severe discomfort glare for a given lamp output then would younger drivers.